Titanium rod, titanium plate, burr treatment method of titanium workpiece

The method of this kind of mechanical treatment is: to bury the Titanium Coil Tube in a lot of abrasives, add some grinding and polishing compounds dissolved in water, use the principle of vibration to mix the abrasives and materials, and continuously wash the workpiece, the surface, and edges of the workpiece Angles, etc. are ground by abrasives and then polished. This technique can be used for deburring, chamfering, derusting, descaling, flattening, and fine polishing for metal parts of various sizes and shapes.

Abrasives can be alumina (including fused, sintered, or natural), corundum, plastic, quartz, ceramics, etc., which can be single or mixed. The shapes of these abrasives can be made into diagonal, cylindrical, diamond-shaped, etc. The reason why pre-shaped abrasives are made first is that they are more economical and wear faster than random-shaped and natural-shaped materials. According to the shape and size of the workpiece, choose abrasives of different shapes and sizes. Abrasives for tumbling include pumice, quartz, granite horns, shells, iron filings, and ceramic fragments. The size of the abrasive grain should be larger or smaller than each hole of the part. The amount of content in the drum is also an important factor affecting the quality of the surface of the parts. The amount of people in the drum is usually 70% of the volume of the drum. The solution in the drum should be added to account for about 95% of the volume of the drum (note: when adding the acidic solution to the drum, add enough water first, and then add acid to prevent parts from corroding during the rolling process, due to the increase in time , the concentration of the built-in solution gradually decreases, and even loses its effect.

Trimming process requirements and methods for titanium alloy forging

In the application of various titanium alloy products, forgings are mostly used in occasions requiring high strength, high toughness, and high reliability, such as gas turbine compressor discs and medical artificial bones. Therefore, not only high dimensional accuracy is required for forgings, but also materials with excellent characteristics and high stability are required. For this reason, in the manufacturing process of forge titanium ring, the characteristics of titanium alloys should be fully utilized to obtain high-quality forgings. Titanium alloy metal is difficult to forge and is prone to cracks. Therefore, it is very important to properly control the forging temperature and plastic deformation in the production of titanium alloy forgings.

Trimming of titanium alloy forgings must meet the following requirements:

1. The incision is smooth, and the metal on the blank must not collapse.

2. There must be no cracks in the part adjacent to the incision surface of the blank, and there must be no uneven grain size caused by uneven trimming deformation.

3. No indentation of the punch shall be left on the trimmed blank, and the shape of the punch and the part shall be exactly the same.

The edge can be trimmed with a milling machine or cut with a band saw and a specially designed friction plate. For large forgings and thick burrs, regardless of the size or batch size of the parts, it is inconvenient to thermally trim the edges, and flame cutting is an effective method. Oxygen gas, plasma, and other techniques can be used to successfully and economically cut burrs of 50 mm or thicker. After flame cutting, heat treatment should be carried out so that the heat-affected zone can be machined. For larger batches of medium and small titanium alloy forgings, the edge is usually trimmed with a die on a crank press, and the edge trimming is carried out at 600-800°C. If straightening must be carried out immediately after trimming, the trimming temperature should be close to the upper limit. Titanium alloys are rarely trimmed with a mold in a cold state because the burrs are very hard and brittle, which may easily cause uneven incisions, and even cause the risk of metal cracking and rapid debris splashing; for some alloys with a high degree of alloying, cold trimming It will cause cracks on the shear surface, and the cracks will extend into the metal from time to time.

Structural Titanium Alloy

Low-strength titanium alloys are mainly used for corrosion-resistant titanium alloys. Other titanium alloys are used for structural parts called structural alloys. In practical applications, structural titanium alloys are divided into: ordinary-strength titanium alloys, medium-strength titanium alloys, and high-strength titanium alloys. alloy. Ordinary strength titanium alloy: due to its good processing and formability and weldability, it is mostly used in the manufacture of various aviation sheet parts and civil products such as hydraulic pipes and bicycles. Medium-strength grade 5 titanium round bar: The typical alloy is TC4, which is mostly used in high-tech industries such as aerospace and rocket launch. High-strength titanium alloys: generally used to replace high-strength structural steel commonly used in aircraft structures.

What are the excellent properties of titanium metal?

1. Low density and high specific strength. The density of titanium metal is 4.51g/cm3, which is higher than that of aluminum and lower than that of steel, copper, and nickel, but its specific strength ranks first among metals. 2. Corrosion resistance. Titanium is a very active metal, its equilibrium potential is very low, and its thermodynamic corrosion tendency in the medium is large. But in fact, titanium is very stable in many media, such as titanium is corrosion-resistant in oxidizing, neutral and weakly reducing media.

This is because titanium and oxygen have a great affinity. In the air or in an oxygen-containing medium, a dense, strong, and inert oxide film is formed on the surface of titanium, which protects the titanium substrate from corrosion. Self-healing or regenerating quickly even due to mechanical wear. This indicates that titanium is a metal with a strong tendency to passivation. The titanium oxide film always maintains this characteristic when the medium temperature is below 315℃.​​

In order to improve the corrosion resistance of titanium, surface treatment technologies such as oxidation, electroplating, plasma spraying, ion nitridation, ion implantation, and laser treatment have been developed to enhance the protection of the titanium oxide film and obtain the desired corrosion resistance. Effect. A series of corrosion-resistant titanium alloys such as titanium-molybdenum, titanium-palladium, titanium-molybdenum-nickel, etc. have been developed for the needs of metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high-temperature wet chlorine gas, and high-temperature chloride.

3. Good heat resistance. The new Grade 1 Pure Titanium Plate can be used for a long time at a temperature of 600 ℃ or higher. Fourth, the low-temperature performance is good. Low-temperature titanium alloys represented by titanium alloys TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V), and Ti-2.5Zr-1.5Mo, the strength increases with the decrease of temperature, but the plasticity does not change. big. It maintains good ductility and toughness at a low temperature of -196-253 °C and avoids the cold brittleness of metals. It is an ideal material for low-temperature containers, storage tanks, and other equipment.

5. Strong anti-dumping performance. When Grade 9 Ti-3Al-2.5V Titanium Plate is subjected to mechanical vibration and electrical vibration, its own vibration attenuation time is very long compared with steel and copper metals. Using this property of titanium, it can be used as a tuning fork, a vibration element of a medical ultrasonic mill, and a vibration film of an audio speaker.

Properties of Ti45Nb Titanium Alloy for Aviation Standard Parts

The new generation of aircraft continues to develop in the direction of high weight reduction, long life and low cost, which greatly increases the amount of advanced composite materials and titanium alloy materials. Ti45Nb titanium alloy can be used as a connector for titanium alloys and composite materials. More and more attention- 2-50. During the "Eleventh Five-Year Plan" period in my country, the application research of T45Nb titanium alloy has been carried out, and Grade 36 Ti45Nb Titanium Wire has been determined as the main rivet material for composite material connection.

Ti45Nb titanium alloy belongs to β-type titanium alloy, which has the characteristics of high plasticity (elongation rate can reach more than 20%, section shrinkage rate can reach 60%~80%), corrosion resistance, excellent cold working performance, etc., and shear strength, tensile strength Higher than pure titanium, the deformation resistance is lower than pure titanium.

A lot of research work has been done on Ti45Nb titanium alloy abroad, the technology is relatively mature, and it was included in the AMS 4982 specification in 1974. In aerospace products, it has completely replaced the pure titanium rivet material, especially the alloy is made with Ti6A14V alloy. The bimetal rivet not only improves the shearing degree of the rivet, but also enables cold riveting. This kind of rivet with excellent comprehensive performance has been widely used in Airbus and Boeing aircraft.

(1) Processed organization. Since the processed Ti45Nb titanium alloy wire is deformed by cold drawing, there are a lot of slip bands at the grain boundary after cold drawing, and the grains are fibrous along the drawing direction.

(2) The annealed state structure. The microstructure of Ti45Nb titanium alloy wire has been recovered and recrystallized after annealing. The grains are equiaxed and the grain boundaries are clear.

Matters needing attention in titanium alloy processing

Pressure machining of titanium alloys is more similar to steel machining than to non-ferrous metals and alloys. Many process parameters of titanium alloys in forging, volume stamping, and sheet stamping are close to those in steel processing. But there are some important features that must be paid attention to when pressing working titanium and titanium alloys.

While it is generally believed that the hexagonal lattices contained in titanium and titanium alloys are less ductile when deformed, various press-working methods used for other structural metals are also applicable to Titanium Alloy Seamless Rectangular Tube. The ratio of yield point to strength limit is one of the characteristic indicators of whether the metal can withstand plastic deformation. The larger this ratio, the worse the plasticity of the metal. For industrially pure titanium in the cooled state, the ratio is 0.72-0.87, compared to 0.6-0.65 for carbon steel and 0.4-0.5 for stainless steel.

Volume stamping, free forging, and other operations related to machining large cross-sections and large-size blanks are carried out in the heated state (above the =μS transition temperature). The temperature range of forging and stamping heating is between 850-1150°C. Alloys BT; M)0, BT1-0, OT4~0 and OT4-1 have satisfactory plastic deformation in the cooling state. Therefore, the parts made of these alloys are mostly made of intermediate annealed blanks without heating and stamping. When the titanium alloy is cold plastically deformed, regardless of its chemical composition and mechanical properties, the strength will be greatly improved, and the plasticity will be correspondingly reduced. For this reason, annealing treatment between processes must be performed.

What are the performance requirements of sputtering targets?

I believe everyone is familiar with sputtering targets. It is mainly used in chips, microelectronics, display screens and other industries. Especially with the development of the electronic information industry, the demand for sputtering targets has gradually increased. The material is also known by more people, so what are the requirements for the performance of the sputtering target during use? The following editor will introduce to you the performance requirements of sputtering targets.

Performance requirements for sputtering targets

1. Purity

Purity is the main performance index of the Ti-Al Sputtering Target. The purity of the sputtering target has a great influence on the performance of the thin film. However, in the actual application process, different products have different requirements for the purity of the target. For example, in the microelectronics industry, with the development of the industry, the size of silicon wafers has been developed, and the width of wiring has been reduced from 0.5um to 0.25um, 0.18um or even 0.13um. The purity of the previous target can be satisfied. The process requirements of 0.35um IC, but the purity of the target material before the preparation of 0.18um lines is not competent, and the purity needs to be higher.

2. Impurity content

Impurities in sputtering targets and oxygen and moisture in pores are the main sources of pollution for target deposition films. Targets with different uses have different requirements for impurity content. Pure aluminum and aluminum alloy targets used in the semiconductor industry have certain special requirements for alkali metal content and radioactive elements.

3. Density

In order to reduce the number of pores in the sputtering target and improve the performance of the sputtering film, the density of the sputtering target also has certain requirements. Because the density of the sputtering target affects the amount of sputtering of the target, it also affects the electrical and optical properties of the film. The higher the density of the target, the better the performance of the film. Not only that, improving the density and strength of the target can also help the target to better withstand the thermal stress during the sputtering process, so the density is also one of the important performance indicators of the sputtering target.

4. Crystal Orientation

 The sputtering target is suitable for sputtering. The atoms of the target are easily sputtered along the relatively close arrangement of the atoms in the hexagonal direction. Therefore, in order to improve the sputtering speed of the target, it is necessary to increase the sputtering by changing the crystal structure of the target. speed. Different materials have different crystal structures, so different forming methods, heat treatment methods and conditions are required to improve the sputtering efficiency of the target and ensure the quality of the deposited films.