Preparing method for superfine and high-bending-strength alloy powder used for diamond tool

Abstract

The invention discloses a preparing method for superfine and high-bending-strength alloy powder used for a diamond tool. The preparing method includes the steps that metal raw materials are prepared and include, by weight percentage, 5%-85% of Cu, 1%-25% of Ni, 1%-20% of Sn, 0%-8% of Si, 1%-15% of Al, 5%-15% of Cr, 0.1%-5% of B, 0.1%-6% of V, 0.1%-5% of Nb, 0.1%-5% of Zr, 0.1%-10% of La and the balance Fe; and the steps of smelting, water atomization, filter pressing dewatering, vacuum drying and reduction are sequentially conducted, and the superfine and high-bending-strength water atomization alloy powder is prepared. Component uniformity of single-particle powder is improved due to the ultrafine granularity of the superfine alloy powder, and meanwhile extremely-high sintering activity is achieved; especially, the added low-melting-point elements promote sintering of a micro liquid phase, a diamond tool bit sintering matrix has higher density, and the holding force on diamond is improved. Due to the fact that the metal structure strengthening alloy elements and the rare earth elements are added, the bending strength is improved to 1900 MPa, finally, the holding force of the matrix on the diamond is improved, and the diamond tool bit tool high in cutting performance is obtained.

Description

[0001] This application is a divisional application filed with the application number 201510845249.7 technical field [0002] The invention relates to the technical field of diamond tool preparation, in particular to a method for preparing ultrafine high-bending-strength alloy powder for diamond tools. Background technique [0003] The cutting mechanism of diamond tools is to use the hardness of diamond to cut hard materials, such as stone, refractory materials, ceramics, semiconductors, concrete, etc. Due to the impact of the diamond during the cutting process, part of the carcass surrounded by the diamond is destroyed, causing the diamond to fall off. Therefore, how to enhance the holding force of the diamond cutter head carcass to the diamond so that the diamond will not fall off prematurely during cutting, thereby improving the cutting efficiency and working life of the diamond tool is a recognized problem in the industry. At present, mixed metal powder or water-atomiz...

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Problems solved by technology

But there are two disadvantages. One is that the price of Ni is also relatively expensive. In order to reduce the manufacturing cost, the content of Ni can only be reduced; When processing medium and high hardness materials, insufficient bending strength, insufficient toughness, excessive wear of the carcass, and insufficient holding force on the diamond often occur, resulting in low tool life. Therefore, the bending strength of the carcass must be increased to improve the carcass. Impact and wear resistance, and enhance the holding force of diamond

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