2015年8月6日星期四

Titanium wire forming stable carbides with carbon a higher hardness. titanium wire Growth carbidelayer between titanium and carbon diffusion rate of titanium carbide layer to decide.
The solubility of carbon in titanium is small, at 850X: When the total is 0.3% at 600C and at approximately 0.1% B drops due to the small solubility of carbon in titanium, so that substantially only by titanium carbide layer and the lower fork domain deposited layer to achieve the purpose of surface hardening. Removal of the oxygen must be carried out under conditions of carburizing, the surface layer hardness as carburizing for steel powder used against carbon monoxide or oxygen to form carbon monoxide surface reaches 2700MPa and 8500MPa, and the head. It is easy to peel off.
In contrast to this, in the deoxidation or decarburization conditions, it may be formed in the charcoal thin carburized layer of titanium carbide. This layer hardness 32OUOMPa, conforming to the hardness of 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 effects of oxygen absorption hardening depth. Only under conditions of very thin thickness, titanium wires in a vacuum or argon - methane atmosphere before the toner may penetrate a sufficient adhesion strength comparison, 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 the increase of the thickness of the titanium carbide layer becomes more brittle and tend to flake t To avoid decomposition leaving Rui alkyl carbon inclusions invasion of titanium carbide layer, it should be used about 2% volume fraction Rui alkyl provisions dose additive gas carburizing in an inert gas. When using propane additive use methane is formed when carburizing low 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 with the best wear resistance. Absorption of hydrogen in the gas type carburizer conditions using either, but had to remove it in the vacuum annealing.

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