Method for preparing silver-nickel-tin-oxide-doped electric contact material on basis of ball-milling method

Abstract

The invention discloses a method for preparing a silver-nickel-tin-oxide-doped electric contact material on the basis of a ball-milling method. The method includes the steps of 1, weighing tin oxide powder, other oxide powder and milling balls respectively, and processing the weighed mixed powder to obtain a primarily-mixed oxide powder body A; 2, mixing silver powder, nickel powder and tin powderwith the primarily-mixed oxide powder body prepared in step 1 to form a mixed powder body B, and performing mechanical alloying surface treatment on the mixed powder body B to obtain a mixed powder body C; and 3, sequentially performing annealing, primary press-forming, sintering, re-pressing and re-sintering treatment on the mixed powder body C obtained in step 2 to finally prepare the silver-nickel-tin-oxide-doped electric contact material. The preparation method solves the problems of high cost, long production cycle and complex process in existing silver-nickel-tin-oxide-doped electric contact material and effectively improves the electrical property of the silver-nickel-tin-oxide-doped electric contact material.

Description

technical field [0001] The invention belongs to the technical field of electrical contact materials, and relates to a method for preparing silver-nickel-tin oxide-doped electrical contact materials based on a ball milling method. [0002] technical background [0003] The existing preparation methods of silver-based electrical contact materials are mainly divided into traditional processes and new processes that are beneficial to improve electrical contact performance. [0004] Traditional preparation of Ag-Ni-SnO 2 The method of electrical contact materials has the advantage of making the oxides in the contact materials evenly distributed, which can effectively avoid the poor oxidation area caused by the internal oxidation method. However, most of the traditional processes exist to make Ag-Ni-SnO 2 The electrical conductivity of the electrical contact material is poor, and the material preparation cycle is long, and the powder is easily polluted. [0005] In recent years, ...

AI Technical Summary

Problems solved by technology

[0004] Traditional preparation of Ag-Ni-SnO 2 The method of electrical contact materials has the advantage of making the oxides in the contact materials evenly distributed, which can effectively avoid the poor oxidation area caused by the internal oxidation method. However, most of the traditional processes exist to make Ag-Ni-SnO 2 The electrical conductivity of the electrical contact material is poor, and the material preparation cycle is long, and the powder is easily polluted

[0005] In recent years, many new powder preparation methods and alloy preparation processes have emerged, such as sol-gel method, plasma spraying method, etc., which have effectively improved the Ag-Ni-SnO 2 The performance of electrical contact materials; but in the current preparation process, the high temperature sintering part will lead to Ag-Ni-SnO 2 Oxidation-reduction reactions occur between elements in electrical contact materials, resulting in by-products, and these processes generally have problems such as high cost, complicated preparation process, and difficulty in industrialization.