Sintering process of products obtained by hard alloy paraffin production process

Abstract

The invention discloses a sintering process of products obtained by a hard alloy paraffin production process and belongs to the technical field of sintering powder metallurgy hard alloy materials. The sintering process of the products obtained by the hard alloy paraffin production process comprises the steps of negative-pressure paraffin removal, vacuum sintering, partial-pressure sintering, rapid cooling and discharging, wherein during the paraffin removal process, the peak curve of the paraffin discharged from the alloy products is completely followed, different temperature-raising slopes are adopted in each stage so as to ensure that the paraffin gas is sequentially and slowly discharged from the alloy products at a constant speed. Hard alloy products prepared by the process disclosed by the invention cannot have problems of cracks, peeling, deformation, carburizing, decarbonization and the like caused by the sintering process; the recovery rate of the paraffin gas discharged from the products is high and can reach above 97%, the pollution to a hearth and a vacuum pump system is reduced and the service life of the device is prolonged; the process time is relatively short, the production benefits are improved, the energy source is saved, the cost is decreased and the market competitiveness is enhanced.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy industry, and in particular relates to a sintering process of hard alloy paraffin wax production process products. Background technique [0002] Cemented carbide was introduced into my country in the 1960s, and now my country has become a major producer of cemented carbide in the world today. It has developed rapidly from production technology to production equipment, and gradually improved from the original "rubber process" to the present. The "paraffin process". [0003] Because cemented carbide is made by adding low melting point metal iron, cobalt, nickel, etc. When making products, a molding agent must be added that is easy to remove at around 400°C. Initially, butadiene rubber and butadiene rubber became the molding agent for "rubber technology". Although rubber can meet the molding requirements of the product, the composition of the rubber is complex, and it is inevitable to leav...

AI Technical Summary

Problems solved by technology

[0006] In view of the sintering process curve of cemented carbide production process products in the prior art, the temperature rises too fast, resulting in fast paraffin vaporization, and a long holding time, the internal and external paraffin of the product is vaporized at the same time, and a large amount of paraffin gas must be discharged from the product at the same time. Paraffin eliminates the mismatch of peak curves, causing problems such as skinning, deformation, cracks and potential safety hazards in products. The invention provides a sintering process for cemented carbide paraffin production process products.