Method and anti-sticking paper for preventing hard metal article from sticking to container in high sintering process

Abstract

The invention provides a method for preventing the carbide alloy products from sticking on the boat pan in the process of high sintering and the antisticking paper. The process includes the following steps: placing the disposable antisticking paper in the boat pan, placing the carbide alloy on the antisticking paper, and taking them into the sintering furnace. The antisticking paper consists of a carbonizing paper base layer 1 and an antisticking layer 2 with the thickness of 10mum to 500mum, wherein the antisticking layer is a ceramic or fireproof materials and the graphite powder mixed coating which is inactive for the carbide alloy and graphite materials, and the ratio of the ceramic or fireproof materials to the graphite powder or the carbon powder by weight is 1-3 : 0.1-1. The process and the antisticking paper provided by the invention can reduce the dust and improve the environment quality. And the products are prepared by the process in high quality.

Description

technical field [0001] The invention relates to a method for preventing a product from sticking to a carrying container in a cemented carbide sintering process and a release paper used for preventing the sticking. Background technique [0002] In the sintering process of some powder metallurgy products of cemented carbide and other components, graphite boats should be used as carrying containers, and the pressed products should be loaded into the boats, and then sent to vacuum furnaces or hydrogen, argon and other atmosphere protection furnaces for further processing. High temperature (eg 1450°C) sintering. Since the main components of cemented carbide are metal carbides such as tungsten carbide and titanium carbide, graphite boats have the characteristics of high strength at high temperatures, can prevent decarburization of products during high-temperature sintering, and are relatively low in price. Therefore, in cemented carbide sintering There are many applications. [...

AI Technical Summary

Problems solved by technology

The cost of this method is low, but the operating environment is harsh and labor-intensive, and the drying of the boat complicates the production process, and the subsequent sandblasting process cannot be omitted

[0007] The dry material method is to use single-component ceramic materials (such as alumina, magnesia, etc.) or multi-component ingredients (such as adding graphite powder to the above-mentioned ceramic powder) with a certain particle size, and put or sprinkle them on the boat before each use. The surface of the dish; this method has low production cost, but the coarse dry material will cause indentation defects on the surface of the product during the sintering process, so this method cannot be used for small products or high-precision products that do not require post-processing, while the fine-grained dry material During use, the dust is flying and the environment is harsh; it is difficult for the fine powder to spread evenly on the surface of the graphite boat, especially the surface of the flat boat.

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