2results about How to "Increase solid solution" patented technology

The application belongs to the technical field of hard alloy, and particularly relates to high-performance hard alloy with dispersed and uniform tantalum carbide and a preparation method thereof. The preparation method comprises the following steps: adding potassium fluotantalate solution into a cobalt-nickel solution; adjusting the pH of the solution to make cobalt, nickel and tantalum completely precipitate, and then filtering, washing with water and drying to obtain cobalt-nickel-tantalum precursors; then reducing, crushing and sieving to obtain precursor powder; mixing the precursor powder with carbon black, tungsten carbide and paraffin, and then wet ball-milling, spray granulating, preparing a compact and sintering to obtain high-performance hard alloy. By adding nickel element, using a liquid-liquid mixing method and reducing, superfine cobalt-nickel solid solution powder is obtained, which can improve the toughness of the alloy; the conversion of tantalum is completed in the sintering process, which is beneficial to the dispersion of tantalum and the strengthening of the alloy performance, improves the solid solution amount of tantalum in cobalt-nickel, inhibits the sintering growth of WC, and improves the hardness and wear resistance of the alloy.

The invention belongs to the technical field of hard alloys, and particularly relates to a high-performance hard alloy with uniformly dispersed tantalum carbide and a preparation method of the high-performance hard alloy. The preparation method comprises the following steps: adding a potassium fluotantalate solution into a cobalt-nickel solution; adjusting the pH value of the solution to completely precipitate cobalt, nickel and tantalum, filtering, washing with water, and drying to obtain a cobalt-nickel-tantalum precursor; then reducing, crushing and sieving to obtain precursor powder; and mixing the precursor powder with carbon black, tungsten carbide and paraffin, carrying out wet ball milling and spray granulation, preparing a pressed blank, and sintering to obtain the high-performance hard alloy. According to the preparation method, by adding the nickel element and using a liquid-liquid mixing method, superfine cobalt-nickel solid solution powder is obtained through reduction, and the toughness of the alloy can be improved; tantalum conversion is completed in the sintering process, tantalum dispersion and alloy performance strengthening are facilitated, the solid solution amount of tantalum in cobalt-nickel is increased, sintering growth of WC is inhibited, and the hardness and wear resistance of the alloy are improved.