Method for preparing high-purity powder material, application thereof, and double-phase powder material

A method for preparing a powder material, comprising the following steps:

• at step 1, selecting initial alloy raw materials, melting the initial alloy raw materials to obtain a homogeneous initial alloy melt;
• at step 2, atomizing and solidifying the initial alloy melt through an atomization comminuting process, to obtain an intermediate alloy powder;
• wherein the intermediate alloy powder comprises a first phase and a second phase, the first phase is granular, the second phase is a matrix phase with a melting point lower than that of the first phase, and first-phase particles are wrapped in the second-phase matrix;
• during the atomization comminuting process, impurity elements in the initial alloy melt and introduced during an atomizing solidification process are enriched in the second- phase matrix, so that the first-phase particles are purified;
• at step 3, removing the second-phase matrix in the intermediate alloy powder, and retaining the first-phase particles, wherein the impurity elements enriched in the second-phase matrix are removed together with the second-phase matrix, so that a high-purity target powder material composed of the first-phase particles is obtained;
• wherein the impurity element in the initial alloy melt is T, and T includes at least one of O, H, N, P, S, F, Cl, I, and Br;
• the major average ingredient of the initial alloy melt is AaMbTd, A includes at least one of Zn, Sn, Pb, Ga, In, Al, Ge, and Cu;
• M includes at least one of Be, Si, Ge, and B, and the proportion of the atomic percent contents of Be, Si, Ge, and B in M to M is greater than or equal to 50%, a, b and c represent the atomic percent contents of corresponding constituent elements respectively, and 0.5%≤a≤99.5%, 0.5%≤b≤99.5%, and 0≤d≤10%;
• and
• the initial alloy powder comprises the first-phase particles with the major ingredient of Mx1Tz1 and the second-phase matrix with the major ingredient of Ax2Tz2;
• 98%≤x1≤100% and 0≤z1≤2%;
• 70%≤x2≤100% and 0≤z2≤30%;
• z1≤d≤z2 and 2z1≤z2;
• x1, z1, x2, and z2 represent the atomic percent contents of corresponding constituent elements respectively.