Progress editor

Progress editor
All countries in the development of new low-cost and high-performance Titanium heat exchanger, titanium alloy into the civilian efforts to make positive industry has huge market potential. New progress of titanium alloy is mainly reflected in the high temperature titanium alloy.
Successfully developed the world's first high-temperature titanium alloy is Ti-6Al-4V, using a temperature of 300-350 ℃. Then have developed a use temperature of 400 ℃ of IMI550, BT3-1 and other alloys, as well as the use of a temperature of 450 ~ 500 ℃ of IMI679, IMI685, Ti-6246, Ti-6242 alloy. Has been successfully applied in military and civil aircraft engines in the new high-temperature Titanium Sheet Metal alloys have British IMI829, IMI834 alloys; United States of Ti-1100 alloy; Russia BT18Y, BT36 alloy. Table 7 for the highest temperature part of the country's new high-temperature titanium alloy.
In recent years, the use of foreign fast solidification / powder metallurgy technology, fiber or particle-reinforced composites developed high temperature titanium alloy as the development direction, so that the use of temperature titanium alloy can be increased to more than 650 ℃ [1,27,29,31 ]. American McDonnell Douglas by rapid solidification / powder metallurgy technology has successfully developed a high-purity, high-density alloy, its strength at 760 ℃ ambient temperature corresponds to the intensity of use of titanium.

The main purpose of titanium alloys

The main purpose of titanium alloys
Titanium is an important structural metal in the 1950s developed, Titanium Sheet Metal because of its high strength, corrosion resistance, and high heat resistance and are widely used in various fields. Many countries recognize the importance of titanium alloy materials, have their research and development, and has been applied. 1950s and 1960s, mainly in the developing high temperature titanium and titanium alloy airframe aviation engine, the 1970s developed a number of corrosion resistant alloys, since the 1980s, corrosion resistant and high-strength titanium alloy has been further development of. Titanium is mainly used for the production of aircraft engine compressor components, followed by structure rockets, missiles and high-speed aircraft.

Carburizing surface treatment of titanium wire

The formation of stable carbon titanium wire with a high hardness carbide. Growth carbonized layer between titanium and carbon diffusion rate of titanium carbide layer is determined.
The solubility of carbon in titanium is small, at 850X: when a total of 0.3% at 600C and at approximately 0.1% B drops due to the small solubility of carbon in titanium, it is basically only by a layer of titanium carbide and the lower fork domain deposited layer to achieve the purpose of surface hardening. Removal of the oxygen must be carried out under the conditions of carburizing, the hardness of the surface layer as applied to steel used in carburizing carbon monoxide or oxygen-containing powder against the surface of the carbon monoxide formed is 2700MPa and 8500MPa, and the head. It is easy to peel off.
Compared with this, the conditions in the decarburization deoxidation or at the charcoal may form a thin layer of titanium carbide carburizing. This layer has a hardness of 32OUOMPa, conforming to the hardness of the titanium carbide. Carburized layer is substantially greater than the depth of the nitrided layer under the same conditions when the nitriding depth with nitrogen. In the oxygen-rich conditions must take into account the influence of oxygen absorption hardening depth. Only under conditions of very thin thickness, in a vacuum or an argon - methane atmosphere, it may penetrate the toner to form a sufficient adhesive strength as compared with this, using a gas carburizing agent may form hard and particularly good adhesion titanium carbide hardened layer. While the 950T: and 10201: temperature between the conditions for the formation of hardened exhibition in 50fim between and. With increasing thickness of the titanium carbide layer becomes more brittle and tend to peel off t To avoid decomposition leaving Rui alkoxy carbon inclusions invasion titanium carbide layer, should be approximately 2% of the volume fraction of the predetermined alkoxy Rui dose of additive gas carburizing in an inert gas. When using propane additives and the use of methane carburizing when he formed the lower surface hardness. When the adhesive force reaches Wu Mao OkPa conditions when using propane gas carburizing, although the measured thickness of the hardened layer is very thin, but it has the best wear resistance. Absorption of hydrogen in the gas type conditions using carburizing agent, but yet had to remove it when the vacuum annealing.

Note the use of titanium wire

Note the use of titanium wire
1, construction workers and welders should wear clean white fine gauze gloves (non-wearing cotton gloves).
2, the weld area treated and non-contact touch iron items.
3, welding work as much as possible in the room, the ambient wind speed should ≤0.5m / s, to avoid influence by drafts.
4, should be as short arc welding using welding, using a small welding heat input, the angle between the nozzle and the weldment maintain 70 to 80 degrees.
5, when the takeover tack welding, butt gap is generally about 0.5mm.
6, each weld seam should be possible once completed, must be connected to the welding seam, before welding the interface should be clean, welding meat lap length of 10 ~ 15mm.
7, welding, torch should not swing around, the end can not be removed from the wire melting gas reserve.
8, arc welding should advance aspirated, not lifted immediately when the torch arc, gas should be delayed until the temperature drops below 250 ℃.
9, gas mask and dragged away from the torch should be the shortest better, with the gap between the wall and strive to minimize contact. When the tube butt welding, forming side welding in order to achieve the requirements of the welding carried out twice: once for the back cover welding (weld when you can not back fill material) and the other for forming welding. When the multi-layer welding, must wait before a weld completely cooled, then the next weld bead.

titanium heat exchanger is a high quality titanium tubing by hot fluid will be part of the heat transfer to the cold fluid heat transfer equipment. With the many advantages of titanium heat exchanger industrial pure titanium, chemical, petroleum, power, food and many other common devices in the industrial sector, plays an important role in production.

Titanium is a metal with a strong passive tendencies. Dielectric oxide film of titanium at temperatures below 315 ℃ always maintain this characteristic. In order to improve the corrosion resistance of titanium, developed oxidation, electroplating, plasma spraying, ion nitriding surface treatment technology, ion implantation and laser processing of titanium oxide film played a role in enhancing the protection, access to the desired corrosion resistance effect. For sulfuric acid, hydrochloric acid, methyl amine solution, the high temperature and high temperature chloride wet chlorine produced in the need for metal materials, development of a titanium - molybdenum, titanium - palladium, titanium - molybdenum - and a series of corrosion resistant nickel titanium alloy.
-32 Titanium castings using a titanium-molybdenum alloy, for often pitting or crevice corrosion environments using titanium -0.3 -0.8 partial molybdenum-nickel alloy or titanium equipment -0.2 using titanium-palladium alloy, have received a very good use effect. Good heat resistance of titanium wire, new titanium or long-term use at higher temperatures 600 ℃.

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