As the hardness of the material being machined and the cutting speed increase, the high temperature performance of the carbide cutting tool is required to be higher. In the existing technology, (Ta, Nb)C is usually added to cemented carbide blades, and one of its functions is to act as a growth inhibitor of cemented carbide grains. The addition of (Tantalum, Niobium)C can prevent the growth of cemented carbide grains in the sintering process. The second function of TiC is to form the third dispersion phase with the exception of WC and Co, which significantly increases the thermal shock resistance, thermal pressure resistance and oxidation resistance of cemented carbides and improves the thermal hardness of cemented carbides. Due to the continuous improvement of application requirements and harsh application environment, the metallographic structure of cemented carbide is more uniform and finer, which puts forward higher requirements for the high temperature resistance performance of cemented carbide. A new solid solution powder was developed, which made the hard alloy have higher high temperature resistance.
In view of the shortcomings of existing technologies, the present invention aims at a solid solution powder of tungsten carbide, titanium, tantalum, hafnium, and the powder is single-phase, the preparation method is simple, and the powder of tungsten carbide, titanium, tantalum, hafnium can improve the high temperature performance of cemented carbide. For the above purposes, the technical scheme of the invention is
The invention relates to a tungsten carbide titanium tantalum hafnium solid solution powder, and the preparation method is
A. According to the calculation of weight, 22-26 parts of tungsten carbide, 30-35 parts of titanium dioxide, 50-55 parts of tantalum oxide, 3-6 parts of hafnium oxide and 24-26 parts of carbon black were mixed evenly, and then the mixed materials were loaded into the graphite vessel and pressed;
B, will be packed material of graphite boat in horizontal tubes into high temperature carbonization, carbonization temperature 18000 C 18000 ° C, pushed the boat for 2 per boat (Γ 40 minutes, high temperature carbonization time for 2 hours I; After cooling for 3 to 6 hours, massive solid solution of tungsten carbide, titanium, tantalum, hafnium was obtained.
C. The bulk solid solution of tungsten carbide, titanium, tantalum, hafnium was ball-ground to obtain single-phase solid solution powder of tungsten carbide, titanium, tantalum, hafnium with Fsss particle size of I. 5 micron and 4 micron. The double-cone mixer is used for optimal mixing described in step a. The mixing time is 4h_8h and the mixing quantity is 100_300kg/ furnace.
The high temperature carbonization described in step b USES CO generated by the reaction as a self-shielding gas to prevent air infiltration.
