Hard alloy degreasing furnace and degreasing method

Abstract

The hard alloy degreasing furnace comprises a furnace body and a controller, a hydrogen input pipe, a nitrogen input pipe, an exhaust pipe, a safety valve and a pressure sensor are connected to the furnace body, valves are arranged on the hydrogen input pipe, the nitrogen input pipe and the exhaust pipe, all the valves and the safety valve are controlled by the controller to be opened and closed, and the pressure sensor is connected with the controller. The dewaxing method comprises the following steps: heating from room temperature to 600 DEG C according to a conventional method; after the temperature reaches 600 DEG C, nitrogen is introduced into the furnace body through a nitrogen input pipe, the ratio of nitrogen to hydrogen in the furnace body is 1: 3, then nitrogen and hydrogen are continuously introduced, the ratio of nitrogen to hydrogen is kept, and the temperature in the furnace body is uniformly increased to 800 DEG C from 600 DEG C within 120 minutes; the nitrogen and the hydrogen are kept to be introduced, the ratio of the nitrogen to the hydrogen is kept, and the temperature in the furnace body is kept at 800 DEG C for 60 minutes; and cooling to room temperature along with the furnace. A brittle third phase generated by W2C and cobalt is avoided or reduced, and the strength of the hard alloy is improved.

Description

technical field [0001] The invention relates to a cemented carbide degreasing furnace and a degreasing method. Background technique [0002] As the main equipment for cemented carbide production, the degreasing furnace is mainly used to remove the forming agent (paraffin, rubber, etc.) in the compact before sintering the cemented carbide, and prevent the forming agent from polluting the sintering furnace. Because hydrogen has the characteristics of high heat transfer efficiency and uniform heat transfer, the degreasing furnace generally uses hydrogen as the carrier gas and protective gas, and the paraffin or rubber in the compact is vaporized in the temperature range of 400°C-600°C and taken out of the furnace to complete the process. The process of degreasing. [0003] Because after the paraffin wax in the cemented carbide is removed, the alloy powder will not have the bonding effect of the binder, and the strength of the cemented carbide blank will be greatly reduced, and...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a cemented carbide degreasing furnace and a degreasing method, which can effectively solve the problem that the strength of cemented carbide decreases due to the continuous introduction of hydrogen during the dewaxing process

Images