What technical requirements do titanium rods need to meet?

Fixed fishing nets used in marine aquaculture, after contact with organic matter and bacteria, diatoms will multiply, while shellfish, barnacles and other marine organisms that feed on diatoms will gather and adhere, which will not only increase the flow resistance and cause the fishing net Decontamination of the fish, and will cause anoxic infections, causing problems such as stunted fish development. For this reason, antiseptics, fungicides, etc. are generally used, but in this case, the service life of the fixed net does not exceed 20 years, and in order to remove the attached microorganisms, the net must be regularly pulled ashore for the mechanical removal, resulting in increased labor costs and Problems such as deterioration of fishing nets. Researchers from the University of Tokyo have studied the weaving of titanium wires into existing polyethylene (PE) fishing nets and electrifying them to electrolyze the seawater near the titanium wires to produce chlorine and ClO-, which can kill bacteria and inhibit bacterial growth. First, a mesh made of platinum-plated titanium wire with a diameter of 1 mm was used as the anode, and a stainless steel 312L plate was used as the cathode to conduct an electrolysis test. The results showed that the applied voltage was 3.0 V. After being placed in seawater for 14 days, the weight of the titanium mesh did not change, while the unpowered titanium mesh attached marine organisms.

The research on braiding is mainly to study the matching of the strength and elongation of titanium wire and PE wire. The existing fishing net is woven by twisting 10 PE monofilaments with a diameter of 0.10 mm into composite yarns and then twisting 2 composite yarns into twisted yarns. The researched titanium mesh is made by twisting 10 PE monofilaments and 1 titanium wire into twisted filaments, and then twisting the two twisted filaments into twisted filaments for weaving. Tensile tests of monofilament, twisted and twisted filaments of different diameter titanium wires (Φ0.10 mm, Φ0.25 mm, and Φ0.50 mm) and PE wires were carried out. The results show that the elongation of titanium wire is lower than that of PE wire, especially the titanium wire of Φ0.10 mm. The titanium wire (Φ0.25 mm, Φ0.50 mm) in the titanium composite wire broke simultaneously with the surrounding PE, and the titanium wire (Φ0.25 mm) in the titanium twisted wire broke simultaneously with the surrounding PE. It shows that the fishing net twisted into the titanium wire has the same strength as the existing fishing net woven with polyethylene wire.

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Titanium tube processing technology and tolerances

Titanium plate has the characteristics of low density, high specific strength and corrosion resistance, and has great potential for application in the automotive industry. The use of titanium and titanium alloys in cars can save fuel, reduce engine noise and vibration, and improve life span. However, for a long time, automotive materials have been the national material for steel, Al and other materials. In order for Ti materials to enter the automotive market, in addition to its own functional advantages, costs must be further reduced to a level acceptable to the automotive industry. Ti titanium plate metallurgical parts for automobiles are a very promising category, but due to the current constraints of cost and other factors, the application and development are slow. Using leading titanium plate metallurgy technology to prepare Ti titanium plate metallurgical parts can not only greatly reduce costs, but also help the promotion of Ti and its alloys in the automotive industry, making it another major application after the aerospace industry category. The development of low-cost titanium and its alloy titanium plates can provide low-cost materials for metallurgical parts of titanium and titanium plates for automobiles. Judging from the existing skills, the sponge Ti powder method, the hydrogenation dehydrogenation method and the metal hydride restoration method are mainly suitable for the automobile industry.

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Welding process of titanium and titanium alloy

As an important metal processing technology, welding plays an important role in industrial production and national defense construction. With the change of industrial structure and the development of science and technology, advanced welding structure is an effective way to reduce material consumption and reduce structure quality. Various welding technologies have broad application prospects. With the development of the titanium industry, its welding technology has attracted more and more attention.

Titanium has the advantages of high specific strength, corrosion resistance of seawater and other media, low temperature resistance, and high fatigue strength at high temperature, low expansion coefficient, good workability, etc. The structure built with it can be used in any natural environment. Can fully play its role. In ship applications, in addition to its characteristics of seawater corrosion resistance and high specific strength, it also has the advantages of non-magnetic, sound transmission, shock resistance and other advantages. The use of titanium and titanium alloys in ships greatly extends the service life of the equipment , Reducing the weight, improving the technical and tactical performance of equipment and the entire ship, so titanium is an excellent ship structure material.

As an important metal processing technology, welding plays an important role in industrial production and national defense construction. With the change of industrial structure and the development of science and technology, advanced welding structure is an effective way to reduce material consumption and reduce structural quality. This welding technology has broad application prospects. With the development of the titanium industry, its welding technology has attracted more and more attention. Titanium has a higher melting point and poor thermal conductivity. Therefore, it is easy to form a larger molten pool due to improper parameter selection during welding, and the temperature of the molten pool is high. This makes the weld and heat-affected zone metal stay at high temperature for a longer time, and the grain growth tendency is obvious, which reduces the plasticity and toughness of the joint and causes cracks. Therefore, the welding process of titanium and titanium alloys is a problem that needs to be solved continuously.

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Titanium surface treatment modification technology

1. Aviation

The largest user of titanium materials in the past and now is the aviation industry. Now titanium and titanium alloy materials are widely used in both military and civil aircraft, and the amount directly affects the rise and fall of the titanium industry. If the world economy enters a recession, it will directly respond In the world's aviation industry, there are fewer people traveling by plane, and the aviation industry of various countries is in decline, and there will be fewer aircraft orders and less titanium consumption. After the September 11 incident occurred in the United States in 2001, the world aviation industry had a short period of low ebb and short-term adjustments. As a result, the titanium industry also shrank for a period of time. At present, the United States is experiencing a storm of subprime debt, which has caused the economy to be in turmoil and again. During the period of slow recession, the world economy was also affected to a certain extent, but it is not yet clear how much impact it will have on the titanium industry. Titanium is mainly used in aircraft in the following places.

(1) It is the engine. The amount of titanium used in each engine accounts for 20-30% of the total weight of the engine. It is mainly the components of the compressor, including blades, hubs, inlet guide valves, and shells.

(2) It is the aircraft skeleton. Titanium is used in this area. Because of the high specific strength of titanium alloy, titanium is the first choice among all metal materials. Everyone knows that our country also needs to manufacture large aircraft, one of which is very important. The hardware is a large-tonnage forging machine. The largest titanium alloy dies forging machine in the world is currently 75,000 tons in Russia. Now a project has been established in Yanliang, Xi’an, and an 80,000-ton die forging machine is prepared. The first phase For the 40,000-ton project, the investment will be 195 million yuan and it will be put into operation at the end of 2009. The second-phase project will be 80,000-ton, and the investment will be 850 million yuan. What material is forged by these die forging machines? It is the aircraft frame made of titanium alloy. Especially the middle and rear sections of the rack. The middle section is the connecting section of the wing and the fuselage, which is the most stressed part of the frame, and the rear section is the installation part of the engine, which is also an important part of the force.

(3) Landing gear. Support frame, etc. Many aeroplane crashes are at the time of take-off and landing. Because the load and impact force of the aeroplane is very large when taking off and landing, the requirements on the landing gear are very high. The choice of titanium alloy not only guarantees the performance requirements of high strength and impact resistance but also is lighter than the choice of high-quality steel.

(4) It is the riveting parts for the wing skin and internal fixation. Some aircraft choose titanium as the wing skin, mainly some military aircraft. There are tens of thousands of rivets and fasteners on an aircraft. Our country produces cold There are three or four professional standard parts factories for hot rivets and fasteners. Their factories only produce various types of bolts, nuts and rivets, most of which are made of titanium and titanium alloy materials.

2. Medical applications

There are two main applications of titanium in medicine, one is pharmaceuticals, and the other is human implants.

(1) Application of titanium equipment in the pharmaceutical industry

In the pharmaceutical production process, the equipment is exposed to hydrochloric acid, nitric acid, acetic acid, sulfuric acid and its salts, and organic solvents and other media, causing serious corrosion of the equipment. If production is stopped frequently for maintenance, production will be affected, and the corrosion of equipment will directly affect the quality of medicines. Therefore, many pharmaceutical companies now use titanium materials for air drying devices, pipes, screw feeders, heaters, and cyclones in pharmaceutical equipment. On the one hand, the corrosion rate is only 0.008—0.003mm/a, and the most important thing is that It is ensured that the quality of the medicine will not be affected by the corrosion of the equipment.

(2) Application of titanium materials on the human body

Because titanium has higher strength, lower modulus, and good biocompatibility, it has now become a common medical substitute for human bones. Titanium is used to make hip joints, elbow joints, bone screws, knee joints, and bone plates. .Dental implants (that is, dental implants in dental hospitals, the price is very high), denture brackets, crown bridges, and orthodontic wires, surgical instruments, heart rhythm regulator boxes, etc. Even now it has developed into titanium alloy precision cast prostheses. Some children have irregular teeth and need to be corrected. The dental hospital will use memory alloy wires made of titanium-nickel alloy for correction. Some people have narrow blood vessels in a certain part, and doctors will recommend implanting blood vessels made of titanium. The stents can now be replaced with titanium materials from head to toe. There is a 68-year-old Peter Horton in the United States who has serious heart disease. In order to save his life, the doctor installed a titanium device in his heart. , To help his heart pump blood. He lived on this device for another seven and a half years, becoming the longest person living with an artificial heart. However, medical titanium materials are the most stringent and critical in terms of quality requirements, especially the metallographic requirements can be said to be the most stringent, higher than the military requirements. Neither can there be segregation at low magnification, and the structure of high magnification must be very uniform.

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Method for burr treatment of titanium rod, titanium plate and titanium workpiece

Titanium alloy has many advantages such as low density, high specific strength, wide operating temperature range (-269~600℃), corrosion resistance, low damping and weldability. It is the best material for aerospace vehicles to reduce weight and improve overall performance. Application level is an important aspect that reflects the advanced degree of aircraft. Improving the comprehensive mechanical properties of aircraft and reducing costs are important measures to promote the application of titanium alloys in the aerospace field.

With the development of aerospace technology, the application range of titanium alloys in the aerospace field continues to expand. Titanium alloy structural parts are increasingly showing the trend of large size, thin-walled curved surface, variable thickness and overall structure, which further improves the aerospace industry. The performance and structural rigidity of the aircraft have reduced weight. Titanium alloy precision forming technology will be the research focus of aerospace manufacturing technology.

Precision forming refers to the forming technology that approaches or meets the accuracy requirements of the part after the part is formed. It is based on the technical achievements of new materials, new equipment, new technology, computer-aided process design, etc., and develops traditional forming technology to realize the product High-efficiency, high-performance, low-cost manufacturing technology with little and no margin, precision-formed parts have high geometric accuracy and surface roughness, precise shape and excellent mechanical properties. Titanium alloy precision forming technology is widely used in the aerospace field, and its use can significantly improve the comprehensive performance and support capabilities of aerospace products such as various combat aircraft, aero engines, strategic and tactical missiles, and launch vehicles. Analyze the application progress of precision hot forming (including precision casting, ultra-speed forming/diffusion bonding, precision spinning and laser direct rapid prototyping) technology in precision forming technology. These technologies can achieve near-net-shape production with a material utilization rate of up to 70% ~90%, has already highlighted a broad development prospect and good application value in the aerospace field.

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The reaction of titanium in air is closely related to temperature.

Artificial joints and artificial bone substitute materials should have the following basic properties: lightweight, high-strength materials, biocompatibility and corrosion resistance, and the reaction of the implanted tissue in the body will not cause material deterioration, repeated stress-induced fatigue, and small damage. The most important properties of metal implants are shape, processing and polishing. They must remain functional during their expected life and will not degrade under fatigue, wear, corrosion and impact loads.

Titanium and titanium alloys meet all the above requirements. Artificial joint materials such as denture powder, polypropylene, plexiglass have low strength, are easy to break, and have poor biocompatibility. Later, stainless steel was used, but the proportion of stainless steel was greater, about twice the proportion of human bones. Under the action of body fluids, the human body would corrode and fracture. Cobalt-chromium alloy is also an excellent artificial joint material, but unfortunately, cobalt and chromium are toxic to the human body. Titanium and titanium alloys are ideal artificial joint materials, which have the advantages of small proportions (similar to the proportion of human bones), high strength, good workability, and corrosion resistance. Titanium materials used for surgical transplantation mainly include pure titanium and ti-6al-4veli alloy. In recent years, Ti-6Al-7Nb and Ti-13nb1-13zr have good compatibility with the human body and have passed the ASTM standard.

Titanium is an artificial bone on which cells can regenerate and bones can grow. Titanium has a good affinity with human bones, epithelium and tissues. In order to improve the surface quality of the implant material connected with the human bone, applying a bioceramic layer to the rough implant surface is also an effective method. At present, titanium and titanium alloys have been widely used in artificial bone joints, artificial bones, joint bottom plates, fracture fixators, bone marrow nails, artificial heart valves, skulls, etc.

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How to improve the rate of titanium plate in mechanical equipment

Titanium screws have the highest price among screws of many materials. Why are titanium screws so expensive? Let's take a look at what kind of metal is titanium screw. In addition to its application in the screw industry, which industries are also used? Titanium screws have the characteristics of low density, high specific strength, good corrosion resistance, low thermal conductivity, non-toxic, non-magnetic, weldable, good biocompatibility, and strong surface decoration. It is a lightweight, high-strength, corrosion-resistant Structural materials are widely used in high-precision fields such as aerospace, medical equipment, sporting goods, and precision products.

1. Medical treatment: Titanium metal material is widely used in the manufacture of medical equipment, artificial hip joints, knee joints, shoulder joints, hypochondriac joints, cranium, active heart valves, and bone fixation clips. Before the use of titanium, medical orthopedics usually used stainless steel as a bone material. However, the use of stainless steel has a disadvantage, that is, it will rust. This has to be taken out after the bone is healed. However, this is for patients, It is a very painful thing.

After the use of titanium "artificial bones", the orthopedics technology is completely changed, and the stainless steel sheet is abandoned. You only need to use titanium plates and titanium screws on the damaged areas of the bones. After a few months, the bones will re-grow in the holes and screws of the titanium plates. The new muscle fibers are wrapped in the titanium plates, and the titanium bones It is connected to flesh and blood just like real bones, and plays a role of support and reinforcement.

Second, the field of sporting goods: the advantages of high strength and low density also make titanium widely used in the field of sporting goods. For example, high-quality bicycle frames and golf clubs are usually made of titanium, which is not only strong and durable, but also light in weight.

3. Application of titanium screws in aerospace and military fields. Titanium has very good durability, so in aircraft engines, bulletproof parts, strengthening parts, reinforcement parts, combustion chambers, turbine shafts, turbine disks, nozzles, etc., most of them are made of titanium alloy materials. It can be seen that titanium is a metal element. The best material for aircraft production.

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