Compression sintering and quenching integrated production process for cemented carbides

Abstract

The invention relates to a pressure sintering and quenching integrated manufacturing process for the hard alloy. The manufacturing process is characterized in that the manufacturing process comprises the process steps that product charge into furnace, vacuum pumping (0.1 to 350Pa), temperature elevation, compression sintering (the temperature is kept at 1350 to 1600DEG C and the product is sintered for 30 to 100 minutes, and the pressure is up to 1 to 10 MPa), cooling down, heat preservation (1000 to 1300 DEG C, for 0 to 100 minutes), decompression (0.10 to 0.65MPa), quenching, cooling down, pressure relief and furnace tapping. The manufacturing process has the advantages that because the two working procedures of pressure sintering and quenching of the hard alloy are integrated into one working procedure and integrated on one device, the equipment investment can be saved on premise that the product quality is not influenced, thus the energy consumption can be reduced by above one time, the production cycle is shortened by above 4.5 times, the production efficiency is improved by above 4.5 times, the production cost is reduced by above one time, the man power is saved by one time, and the worksite is saved by about one time.

Description

technical field [0001] The invention relates to the field of cemented carbide production technology. Background technique [0002] The sintering technology of cemented carbide mainly includes vacuum sintering and pressure sintering. Since vacuum sintering is in a negative pressure state, during the sintering process, when the structure of the product is densified, there is no external pressure, resulting in incomplete densification and residual pores and pores. There are more, so there are more fracture sources and the material strength is low. Pressure sintering means that during the sintering and densification process of the product, external pressure is applied, the internal structure of the material is denser, and the pores and holes remain less, so the number and size of fracture sources are greatly reduced, and the material strength is significantly improved. The quenching process can transform most of the cobalt phase in the internal structure of the material into a ...

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Problems solved by technology

[0007] The purpose of the present invention is exactly for known hard alloy pressure sintering quenching is to be completed by pressure sintering and quenching two processes separately, therefore need two sets of devices, equipment investment is big, working procedure is many, energy consumption is big, inert gas consumption is big, It is labor-intensive and time-consuming, and although vacuum sintering and quenching is completed in one process, the strength of the product is low, so we provide a cemented carbide pressure sintering and quenching integrated production process that completes pressure sintering and quenching in one process

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