Abstract:Titanium wire forms a stable carbide with higher hardness with carbon. The growth of the carbide lay...
forms a stable carbide with higher hardness with carbon. The growth of the carbide layer between titanium and carbon is determined by the diffusion rate of titanium in the carbide layer.
The solubility of carbon in titanium is less than 850X: a total of 0.3%, and about 0.1% at 600C. Due to the low solubility of carbon in titanium, it basically only passes through the titanium carbide layer and the deposition layer of the lower fork domain. to achieve surface hardening. Carburizing must be carried out under the condition of deoxygenation, because the hardness of the surface layer formed by the powder suitable for steel carburizing against the surface of carbon monoxide or oxygen-containing carbon monoxide reaches 2700MPa and 8500MPa, and it is easy to peel off.
In contrast, carburizing in charcoal may form a thin layer of titanium carbide under deoxidizing or decarburizing conditions. The hardness of this layer is 32OUOMPa, which is in line with the hardness of titanium carbide. The depth of the carburized layer is substantially greater than the depth of the nitrided layer when nitriding with nitrogen under the same conditions. In oxygen-enriched conditions, it must be taken into account that the absorption of oxygen affects the depth of hardening. Only in very thin layer thickness conditions, it is possible to infiltrate carbon powder in a vacuum or an argon-methane atmosphere to form sufficient adhesion strength. Compared with this, the use of gas carburizing agents can form particularly hard and good adhesion. hardened layer of titanium carbide. At the same time, the hardening developed under the condition of temperature between 950T: and 10201: is between 50fim and . As the layer thickness increases, the titanium carbide layer becomes more brittle and tends to peel off. In order to avoid the intrusion of carbon inclusions into the titanium carbide layer due to the decomposition of the ruthene, a regulation of approximately 2% by volume of ruthene should be used. Dosage Additives Gas carburizing in inert gas. Lower surface hardness results when carburizing with methane using propane additives. When the bonding strength reaches 9000kPa, when gas carburized propane is used, although the measured thickness of the hardened layer is very thin, it has the best wear resistance. Hydrogen is absorbed under the condition of gas-type carburizing agent, but it has to be removed again during vacuum annealing.