A TiC WC % 26 ndash; Co alloy and WC%26mdash; TiC % 26 ndash; Tac % 26 ndash; The production process of Co alloy is characterized by the preparation of the solid solution of various carbides, namely complex carbides. The compound carbide can be used as a mixture of tungsten powder, TiO2, Ta2O5 and carbon black, which is heated to 2000C in a vacuum induction furnace to carbonization, and the TiC%26mdash can be made. TaC or WC % 26 ndash; TiC solid solution. In the final phase of carbonization a vacuum can be used to ensure sufficient carbon content. Another method is to carbonize the mixture of several carbides in a high vacuum to 2000-2500c, which reduces the oxygen and nitrogen content in the mixture. Another production of WC%26mdash; The method of TiC solid solution is called %26ldquo; Solvent method throughout % 26; First, all single carbide is dissolved in liquid nickel. When cooled, solid solution carbide is deposited in crystalline form. Other processes are the same as tungsten and cobalt carbide.
Compared with tungsten-cobalt hard alloy, the flexural strength of tungsten-ti cemented carbide with the same cobalt content was lower, and decreased with the increase of TiC content. Similar to tungsten-cobalt hard alloy, the carbon content is not suitable when the alloy also appears graphite or %26eta; Phase 1, after adding TiC, the range of carbon content allowed by alloy is wider than that of tungsten cobalt hard alloy. (Ti, w)C solid solution composition and grain size have great influence on the microstructure and properties of the alloy. In the sintering temperature, the unsaturated solid solution (such as TiC: WC= 50:50), the alloy has higher hardness and cutting life, and the bending strength is reduced. Using saturated solid solution (such as TiC: WC=28.75:71.25), the alloy has higher flexural strength, hardness and lower cutting life. The hardness of the alloy increases with the decrease of the grain size of the carbide phase (including WC and Ti and W). For three phase alloy, because of the (Ti, W) phase C content is less, the WC grain can improve the bending strength of the alloy increase, but in two-phase alloy (Ti, W) C phase grain size increases can reduce the bending strength of the alloy instead.
