M<y>(C<X>N<1-X>) powder rotary type dynamic continuous preparation method and sintering device

Abstract

The invention relates to a M<y>(C<X>N<1-X>) powder rotary type dynamic continuous preparation method and a sintering device, wherein in the chemical formula of M<y>(C<X>N<1-X>), M is one of Ti, Cr, V, Ta, Mo, Nb, Zr, Hf, W and Mn, y is 1 or 2, X is greater than or equal to 0.1 and smaller than or equal to 0.9, and the preparation method comprises the following technological steps: (1), compounding, wherein the raw materials comprise compound powder of M and O and a reducing agent; (2), mixing and drying; (3), sintering, in an open system or closed system, a furnace tube is heated under the condition that the furnace tube is in a sloping state in which a discharge opening is lower than a feed opening and a rotation state, when the temperature in the furnace tube reaches the reaction temperature, the powder mixture obtained in step (2) is continuously fed into the furnace tube, the powder mixture, after entering the furnace tube, completes reaction in a manner of performing helical motion through a furnace tube heating area to form a reaction product to falls into a collecting chamber. According to the M<y>(C<X>N<1-X>) powder rotary type dynamic continuous preparation method and the sintering device, provided by the invention, single-phase M<y>(C<X>N<1-X>) powder can be obtained and continuous batch production can be realized.

Description

technical field [0001] The invention belongs to the technical field of carbonitride powder preparation, in particular to a dynamic continuous preparation method and a sintering device of carbonitride powder. Background technique [0002] Cermet powder is a new type of multifunctional material, which is widely used in hard tool materials, High-temperature resistant parts, wear-resistant parts, corrosion-resistant parts, alloy additives and other parts with special requirements have extremely broad development potential and application prospects in the fields of aerospace, military, machinery, metallurgy, electronics, and chemical industry. received great attention from all over the world. Carbonitride powder is a type of carbonitride powder prepared based on the carbothermal reduction nitriding method. The thermodynamic synthesis temperature range of each carbonitride powder overlaps. The uneven temperature during the synthesis process will lead to a decrease in the purity o...

AI Technical Summary

Problems solved by technology

The layer-by-layer stacking of raw materials makes each layer of products greatly affected by the temperature field, which easily leads to uneven heating of raw materials during the synthesis process, so that the reduction and carbonization of raw materials at different positions at the same time are in different stages, and the stacking of materials makes the bottom layer The original powder is difficult to contact with the reducing atmosphere, which hinders the reduction carbonization and nitriding process

These all make it difficult to obtain single-phase carbonitride powder, and the product composition and particle size distribution range is relatively large, which greatly affects the physical and chemical properties of carbonitride powder and limits its wide application.

Chinese patent ZL201210122956.X discloses "a preparation method of nano-M(C,N) powder", using highly active nano-TiO 2 , nano-carbon black and aromatic aldehydes as raw materials to improve reaction kinetics, promote carbothermal reduction process, and react under vacuum or flowing atmosphere, although a small amount of single-phase nano-M(C,N) powder can be prepared in the laboratory , but because it is also equipped with vacuum sintering furnace or carbon tube furnace, it is difficult to ensure the uniformity of the temperature of the material in the furnace during the reaction process when the amount of material is large, and the preparation process is an intermittent operation, the output and efficiency are not high, and it is difficult to produce in batches

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