Titanium and titanium alloy

Titanium and titanium alloy, light weight, high strength, high yield ratio, non magnetic, biologically inert, and has excellent corrosion resistance. In seawater environment, titanium and Titanium castings almost no corrosion, corrosion resistance is excellent in most chemical medium. At present, with the progress of science and technology and all walks of life to the application of new materials to increase the strength, the necessary products of Titanium castings valve as the medium of various special environment and special fluid delivery system has been used. However, the fluid medium and environmental conditions in different areas and industries are not the same, performance requirements of the material used on different titanium valve. At the same time, because of the different components of Titanium precision castings alloy valveperformance requirements are different, different process, and to reduce the cost of parts needed to use alternative materials and other factors, the material has become one of the technical problems of first consideration must be titanium valve design and manufacturing, and suffer the widespread concern and attention. Industrial pure titanium refers to non titanium alloys with different Fe, C, N, O and other impurities content.

Titanium alloy plate prices

Titanium alloy plate at the current price trend is not particularly good, the recent domestic titanium plate market demand are relatively sluggish, prices remain low stage, the short term, the market price will be difficult to recover, the current 2mm pure titanium plates plate price in the 105-115 yuan / kg (15.51-16.99 dollars / kg). Titanium is a metallic element, grey, atomic number 22, relative atomic mass 47.87. Combustion in nitrogen, high melting point. Blunt titanium and titanium based alloy is a structure with new materials, mainly for the aerospace industry and marine industry.
Titanium density of 4.506-4.516 g / cubic centimeters (20 DEG C), higher than that of aluminum and iron, copper, nickel below. But in the first than the strength of the metal, is 3 times of stainless steel, is the aluminum alloy [colored business: 1.3 times of the aluminum alloy plate]. The melting point of 1668 - 4 DEG C, the latent heat of fusion of 3.7-5.0 kcal / atom, the boiling point of 3260 plus or minus 20 DEG C, the latent heat of vaporization of 102.5-112.5 kcal / atom, the critical temperature of 4350 DEG C, the critical pressure of 1130 atm. Poor thermal conductivity and conductive properties of Sunrui titanium coils , similar to or slightly lower than stainless steel, titanium superconductor, superconducting critical temperature of pure titanium 0.38-0.4K. At 25 DEG C, titanium heat capacity is 0.126 cards / atom and degree, 1149 card / molecular enthalpy, entropy is 7.33 cards / atom and degree, metal titanium is paramagnetic material, permeability is 1.00004. Titanium has plasticity, extending high pure titanium rate can reach 50-60%, section shrinkage rate of 70-80%, but low strength, not as structure material. Titanium in the presence of impurities, a great influence on the mechanical properties, especially the interstitial impurities (oxygen, nitrogen, carbon) can greatly improve the strength of titanium, significantly reduced its plastic. Good mechanical properties with titanium as a structural material, through strict control of the impurity content is appropriate and adding alloy elements and to achieve.

Titanium alloy

Titanium alloy is with titanium alloy added other elements. There are two kinds of different titanium crystal: 882 DEG C for close packed six party structure titanium, 882 DEG C beta titanium as the body centered cubic. Alloy elements according to their influence on the phase transition Titanium Ingot temperature can be divided into three categories:
A stable alpha phase, increase the phase transition temperature of the element as the alpha stable elements, aluminum, carbon, oxygen and nitrogen. The aluminum is the main alloy titanium alloy elements, it is to reduce the quality of the alloy at room temperature and high titanium alloy temperature strength, elastic modulus, increase proportion has obvious effect.
The stability of beta phase, reduce the transition temperature element for beta stable elements, can divide again isomorphous and eutectoid type two. The application of titanium alloy products, the former are molybdenum, niobium, vanadium; the latter with chromium, manganese, copper, iron, silicon, etc..

The role of titanium ingot segregation effects

Seen from the front , consumable arc melting , the solidification of titanium ingots from the bottom of the ingot in the order gradually to - wide solidification solidification process is in order. As a result, some of the titanium alloy ingot impurity elements to different parts of the ingot are regularly distributed , resulting in segregation effects. The principle of effective government is also purified metal smelting area . It makes titanium ingots alloying elements or impurities in small ingots showing the distribution area segregation.
    Segregation effect occurs with titanium ingot ( or metal sticks ) impurities ( or alloying elements ) equilibrium distribution constant K0 relevant ; segregation effects arising after the gradual solidification of the cash borrowed from the theory of a titanium ingots left to be addressed on that theory when the order reported titanium ingot ingot Titanium Casting Manufacturer solidification small impurity distribution diagram . The actual status of titanium ingots similar.
    However , the rapid melting process flexor directional solidification process , the impurity diffusion between the two phases in the shelter group can not reach equilibrium , so it's not a distribution constant K0, segregation of some small effect . When titanium melting, segregation should be a purifying effect of the role , as long as the use of light ingots , you can reduce the effects of impurities.
    Secondary smelting produce titanium casting factory consumable content of impurities TA2 pure milled raw material ingot Table relationship , which is the average of 100 titanium ingots . As can be seen from the table, iron , titanium ingot and the nitrogen concentration of the titanium sponge has not changed , the purification effect of sky ; silicon, carbon and oxygen increased slightly , and no purification effect, but in the smelting process is increased impurity contamination volume ; Lee hydrogen chloride purification obvious effect , do not hold the product in a reduced number of chlorine and level . It also shows that the main role of vacuum distillation . Both the total amount of impurities from the point of view , slightly lower than the titanium ingot of titanium sponge impurities, by lowering the melting sponge drink chlorine , and slightly increases the oxygen and other impurities. In short , a slight increase in the purity of titanium , but it remains in a substantially horizontal magnitude .

Metal casting surface deformation, flow marks defects titanium check valve

     Deformation, surface flow marks were casting and casting design related. Casting too small, except

Casting incomplete, the surface of titanium sheets the casting marks often exist, casting deformation obvious. Furthermore,

the quench casting defects will result in the above.
     As a new titanium dental materials with excellent biocompatibility, high strength, good corrosion

resistance, semi-transmissive titanium heat pumps advantages for X-ray showed, is an ideal repair material. However, titanium

casting technology in only 10 years of history of dental prosthesis production, production of cast titanium

denture and partial denture fixed frame is still in the development stage. Need to constantly sum up

experience in the dental Titanium Welded Tubes cast titanium, improving the quality of titanium denture.