(m1,m2)(c x no 1‑x ) push type dynamic continuous preparation method of powder and push type dynamic continuous sintering device

Abstract

The invention provides a push-type dynamic continuous preparation method of (M1,M2)(CxN1-x) powder. In the chemical formula of (M1,M2)(CxN1-x), M1 is one of Ti, V and Cr, M2 is at least one of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W, Mn and lanthanide rare earth elements, the mass of M1 is 60-90% of the sum of the masses of M1 and M2, M1 and M2 cannot be a same element, and x is not smaller than 0.1 and not greater than 0.9. The method comprises the following steps: 1, burdening materials; 2, putting the raw material in a ball mill, carrying out wet milling, and drying the above obtained mixed slurry; and 3, introducing nitrogen or a nitrogen and argon mixed gas into a sintering apparatus, sintering, continuously putting reaction boats carrying the materials into a feeding chamber in the sintering process, intermittently pushing the reaction boats carrying with the obtained mixed powder toward the direction of a material at a uniform speed, and allowing the reaction boats to sequentially go through a preheating chamber, a reaction chamber and a cooling chamber to obtain the (M1,M2)(CxN1-x) powder. The invention also provides a push-type dynamic continuous sintering apparatus used for the method.

Description

technical field [0001] The invention belongs to the field of carbonitride powder preparation, in particular to a continuous preparation method and a continuous sintering device for carbonitride powder. Background technique [0002] Carbonitride powder is mainly used to prepare cermets. The cermets prepared from carbonitride powders have good red hardness and crater wear resistance. This type of cermets has high melting point, high hardness and good wear resistance. It has strong corrosion resistance, low manufacturing cost, and broad application prospects. It is a ceramic material that is highly valued by major industrial countries in the world. The performance of this type of cermet depends largely on the properties of the carbonitride powder, including the particle size and particle size distribution, purity, carbonization completeness, free carbon content, oxygen content, etc. of the powder. Therefore, the efficient preparation of high-quality carbonitride powder is of g...

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Problems solved by technology

This method has the following disadvantages: (1) there is inhomogeneity in the temperature field of raw materials heated during the synthesis process, so the raw materials at different positions at the same time are in different reaction stages, and it takes a long time to obtain a product composed of a single phase, and the composition of the product (2) In the gas-solid reaction stage, material stacking makes it difficult for the raw material powder in the lower layer to come into contact with the reducing atmosphere, which hinders the process of reductive carbonization and nitriding, and causes the composition of the product to and particle size are not uniform, which will seriously affect the physical and chemical properties of the product; (3) the method cannot be continuously produced and the production cycle is long, resulting in excessively high cost of industrial production

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