Preparation method for hard alloy product with composite structure

Abstract

The invention provides a method for preparing a hard alloy product with a composite structure. The method comprises the following steps of A. preparing hard alloy mixtures of an inner layer and an outer layer through a powder metallurgy technology separately, and independently selecting the materials of the inner layer and the outer layer from one or two of WC-Binder or WC-MeC-Binder, wherein Binder is a binder, and is selected from one or more of Co, Ni, Fe or Cr, and MeC is selected from one or more of transition refractory metal carbides; B. forming an inner layer pressed blank and an outerlayer pressed blank separately; C. sleeving the inner layer pressed blank and the outer layer pressed blank together, and sintering; and D. carrying out finished product processing to obtain the hardalloy product with the composite structure. The hard alloy product with the composite structure and prepared by the method has the advantages of being easy in specific gravity and shape control, simple to manufacture, and low in cost.

Description

technical field [0001] The invention belongs to the technical field of cemented carbide, and relates to a preparation technology of a cemented carbide product with a composite structure, in particular to a method for preparing a cemented carbide roll ring product with a composite structure, especially a high-speed wire rod rolling mill The preparation method of the cemented carbide roller ring used. Background technique [0002] Cemented carbide is a kind of composite material prepared by powder metallurgy technology, with refractory metal carbides such as WC, TiC, TaC, NbC as hard phase, and plastic metals and alloys such as Co, Ni, Fe as binder phase. , has good wear resistance, heat resistance, corrosion resistance and high toughness, and is widely used in various fields of the national economy. [0003] Carbide roll rings have become the standard consumable parts of high-speed wire rod mills in the 1960s and 1970s. After nearly half a century of development, their mater...

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Problems solved by technology

The composite cemented carbide product adopts the method of "independent compact co-sintering" to realize bonding and compounding. By controlling the binder content of the inner layer and the outer layer of cemented carbide (hereinafter referred to as "B" respectively) 内 " and "B 外 ” indicates), the average grain size of the hard phase after independent sintering of the inner and outer hard alloys (hereinafter referred to as “dα 内 " and " dα 外 "Indicates, according to the national standard GB3488, ISO4499 or ASTM B390 assessment) and the total carbon content of WC used in the inner and outer cemented carbide (hereinafter referred to as "Ct 内 " and "Ct 外 ” means) to control the liquid phase migration behavior between the inner layer and the outer layer during sintering, so as to solve the problems of deformation and incomplete bonding of the inner and outer layers during sintering

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