Target performance requirements

The target restricts the physical and mechanical properties of the sputtered film and affects the quality of the coating. Therefore, the target quality evaluation is relatively strict, and the following requirements should be met:

1) Low impurity content and high purity. The purity of the target material affects the uniformity of the film.

2) High density. The high-density target has the advantages of good electrical conductivity, good thermal conductivity, and high strength. Using this target for coating, the sputtering power is small, the film-forming rate is high, the film is not easy to crack, the Ti-Al Sputtering Target has a long service life, and the resistivity of the sputtered film is high. low, high transmittance.

3) The composition and structure are uniforms. The uniform target composition is an important guarantee for stable coating quality.

4) The grain size is small. The finer the grain size of the target, the more uniform the thickness distribution of the Titanium Sputtering Target, and the faster the sputtering rate. Because of the above-mentioned special requirements on the performance of the target, its preparation process is relatively complicated.

The main characteristics of titanium rod and titanium alloy material processing

Titanium rods and titanium alloys have high chemical activity. titanium rods and titanium alloys are prone to violent reactions with oxygen, nitrogen and other oxygen-containing gases at high temperatures. When the surface of the billet is heated in air, an oxide scale and a surface getter layer are formed. Titanium rods and titanium alloys are easy to absorb hydrogen when heated, which causes difficulties in the processing of certain types of titanium alloys.

The thermal conductivity of titanium rods and titanium alloys is poor. The thermal conductivity of titanium rods and titanium alloys is usually only 1/15 of the thermal conductivity of aluminum alloys and 1/5 of steel. The low thermal conductivity leads to a large temperature difference along the section of the ingot and the billet in the hot B inch, resulting in a large thermal stress, and cracks will be formed in severe cases, so the heating speed must be limited, and the variable temperature, deformation speed, Deformation rate, deformation equipment.

Polycrystalline transformation of titanium rods and titanium alloys. Titanium has a-β phase transition. Heating to the p temperature can significantly improve the plasticity and reduce the deformation resistance, but the deformation of the β region is not enough to obtain the organization with good performance.

The cold deformation ability of titanium alloy is low. The cold working deformation of most titanium alloys is difficult, and a little preheating (to 200~300T) can significantly reduce the deformation resistance and improve the plasticity.

Titanium is easy to bond and deform molds. This tendency is easy to deteriorate the surface quality of the processed material, and puts forward more stringent requirements for deformation tools and process lubrication.

High yield ratio and low elastic modulus. Straightening in the cold state is very difficult.

The above processing characteristics should be fully considered when formulating the production process.

Treatment method of center deviation of titanium screw

When the diameter of the titanium metric screw is less than 30mm and the center line is offset within 30mm, you can first use oxyacetylene to bake the bolt red, and then use a sledgehammer to bend the bolt (or bend it with a jack). Prevents recovery when the bolt is tightened.

If the spacing of the Titanium Eye Bolt is not correct, you can use a sledgehammer to bend them after being baked with an oxyacetylene flame, and weld a steel plate in the middle to reinforce it, and then fill it to death in the subsequent grouting.

For large displacement of large bolts (diameter above 30mm), the bolts should be cut off first, and a steel plate should be welded in the middle of the bolts. If the bolt strength is not enough, two reinforcing steel plates can be welded on both sides of the bolt. 3 to 4 times smaller than the diameter of the bolt.

Treatment method of titanium tube surface

The alloying of the surface of the titanium alloy tube can also be called a kind of coating. Compared with the oxide coating of palladium-coated on titanium, it has the advantages of strong bonding force, wear resistance and corrosion resistance. Compared with titanium-palladium alloy, palladium has high surface content, which saves precious metal palladium, reduces cost, and also has excellent performance.

Aluminizing the surface of the titanium tube can reduce the hydrogen absorption tendency of titanium. It is a good aluminizing condition to mix 88% alumina, 4% aluminum fluoride and 8% aluminum powder and coat it on the titanium workpiece. The temperature is 810 °C . The thickness and structure of the aluminized layer depend on the holding time. Using the infiltration method to aluminize, a thin coating with a thickness of about 2 mm can be obtained by diffusion in a short time, and the bonding force is good and does not affect the mechanical properties of the substrate. The coating consists mainly of the titanium oxide phase, forming a very effective barrier against hydrogen permeation.

After the palladium is plated on the Grade 9 Ti3Al2.5V Titanium Pipe, the palladium-plated layer can be diffused to the surface area of ​​the titanium tube by heating in different ways to form a titanium-palladium alloyed layer on the surface layer, thereby improving the corrosion resistance. Heating diffusion or laser surface remelting are in principle feasible. Using a laser to irradiate the titanium surface to make it melt and condense rapidly, the pre-vacuum-deposited 150-micron palladium-plated film can be rapidly melted to form an effective palladium alloy.

Surface treatment of titanium tubes has many advantages, which can not only increase the oxidation resistance of titanium tubes, but also enhance the gloss of the surface of titanium tubes. Different titanium tube surface treatment methods will meet different performance requirements for titanium tubes, which is an important manifestation of the production and manufacturing capabilities of titanium tube manufacturers at this stage.

Precision Problems in Machining of Titanium Alloy Fasteners

In the production and processing of grade 5 titanium round rod and candied fruit, the precision requirements for machinery will be higher. In mechanical production, because the tool is in a state of working wear during each production process, and it is calibrated according to the program, the density of titanium alloy fasteners is higher, and the tool is easily worn during the machining process. Under the state, the tool is still processed according to the program, and it is easy to cause the precision of the compact part to be affected during the processing. If the precision of the fasteners is not strictly controlled within the error range during the entire processing process, the titanium tubing for bike frame and other materials cannot be tightly connected during the use process, which will have a certain impact on the subsequent use and improve The precision of titanium alloy fasteners in the machining production process is a major problem that needs to be overcome in the production process. Fastener technology products are products made in high-precision production workshops, and the connection performance of such products is better.

The effect of laser welding on the surface treatment of titanium rods!

The process parameters of laser welding are difficult to grasp because the thermal efficiency fluctuates greatly during the welding process, and the surface condition of the welded titanium rod has a great influence on the thermal efficiency: the brighter the surface, the larger the emitted laser light, and most of the laser energy is reflected on other objects. , transferred to the surrounding material or medium in the form of "heat". But thermal efficiency changes suddenly. Before the grade 5 titanium round rod is melted, only about 10%-20% of the light energy is absorbed by the titanium rod and heats the titanium rod. When the temperature rises to the melting point of the weld metal and begins to melt, the light absorption rate of the titanium rod increases sharply. that at this time, about 60%-80% of the light capacity is absorbed by the metal, and the sudden change of thermal effect can easily cause the weld to burn through.

In order to avoid or reduce this adverse effect, you can take corresponding measures, such as welding titanium rods; roughening the surface, using a pulsed laser beam; adjusting the input energy; adjusting the spot size; Pulse width and steepness.

A ruby ​​natural crystal containing aluminum oxide and dissolved with a low concentration of chromium atoms is used as the working material of the laser generator, which is called a solid-state laser generator. If CO2 is used as the working substance of the laser generator, it is called a force gas laser generator.

At present, the power of the laser welding machine is only kilowatts, and it is expensive, the welding cost is high, and the application range is not wide. It is only used for the solder joints of some tiny parts in the manufacture of some instruments and meters, especially when some solder joints are hidden and cannot be welded by ordinary welding methods. Multi-station welding is possible using laser beams, optical fibers and deflection prisms.

What are the technical requirements for titanium tubes?

The titanium tube is light in weight, high in strength and superior in mechanical properties. It is widely used in heat exchange equipment, such as shell and tube heat exchangers, coil heat exchangers, serpentine heat exchangers, condensers, evaporators and conveying pipes, etc. Many nuclear power industries use titanium tubes as standard tubes for their units. titanium seamless tubing

skills requirement:

1. The chemical composition of titanium and titanium alloy pipes shall comply with the provisions of GB/T3620.1. When the buyer re-inspects, the allowable deviation of the chemical composition of Mingkun Titanium Industry shall comply with the provisions of GB/T3620.2.

2. The allowable deviation of the outer diameter of the pipe should meet the regulations.

3. The allowable deviation of the wall thickness of the pipe should not exceed ±12.5% ​​of its nominal wall thickness. The allowable deviation of the wall thickness of the pipe does not apply to the welding seam of the titanium welded pipe. Titanium Alloy Seamless Rectangular Tube

4. The length of the pipe should meet the regulations.

5. The fixed length or multiple length of the pipe should be within the range of its indefinite length, the allowable deviation of the fixed length is +10mm, and the multiple length should also be included in the incision amount when the pipe is cut, and each incision should be 5mm. .