Patent ID: 11919072
Assignee: ZHENGZHOU RESEARCH INSTITUTE OF MECHANICAL ENGINEERING CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  Y | IPC B

Claim 3:
4. A preparation process of multi-component spherical alloy powder, characterized by adopting a PREP method to prepare multi-component spherical alloy powder, and the multi-component alloy includes at least one of refractory metals and compounds thereof, specifically including tungsten, molybdenum, tantalum, niobium, rhenium, tungsten carbide, tantalum carbide;
wherein the preparation method thereof is as follows:
2.1 preparing a multi-component alloy rod; and
2.2 preparing multi-component spherical alloy powder by the PREP method with the alloy rod of step 2.1;
wherein a porous framework method is adopted to prepare the multi-component alloy rod in step 2.1, and the preparation method thereof is as follows:
7.1 mixing refractory metal or its compound power particles with a large particle size used as the raw material with a spherical pore-forming agent and then putting into a mixer for mixing;
7.2 putting the evenly mixed powder on a hydraulic testing machine for compression molding to obtain a cylindrical rod-shaped green body;
7.3 removing the pore-forming agent from the cylindrical rod-shaped green body through a water solution method or a heating method;
7.4 sintering the green body in a vacuum tungsten wire sintering furnace at 1200 C-1800 C; during the heating process, keeping the heating rate at 10 C/min, the vacuum degree at about 10-3 Pa and the holding time for 3 h, and then cooling the green body with the furnace to obtain a three-dimensional penetrating self-continuous porous framework made of a refractory metal or compound thereof;
7.5 placing the framework made of the refractory metal or compound thereof in the center of a cylindrical mold, then adding other required elements to a smelting furnace in the form of element or compound to be smelted into a liquid state, and then pouring the liquid metal into the mold to obtain a cylindrical multi-component alloy rod; and
7.6 treating the surface of the multi-component alloy rod to make the dimensional accuracy and surface quality thereof meet the requirements of the PREP method.