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m y (c x no 1-x ) push type dynamic continuous preparation method and sintering device for powder

A sintering device, push-type technology, applied in the direction of nitrogen and non-metallic compounds, etc., can solve the problems of low output and efficiency, affecting the physical and chemical properties of carbonitride powder, and large product composition and particle size distribution range.

Active Publication Date: 2019-07-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 achieve mass production

Method used

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  • m <sub>y</sub> (c <sub>x</sub> no <sub>1-x</sub> ) push type dynamic continuous preparation method and sintering device for powder
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  • m <sub>y</sub> (c <sub>x</sub> no <sub>1-x</sub> ) push type dynamic continuous preparation method and sintering device for powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The structure of the push-type dynamic continuous sintering device in this embodiment is as follows figure 1 , figure 2 As shown, the feeding chamber 2, the preheating chamber 4, the reaction chamber 10, the heat insulation chamber 13, the cooling chamber 15, and the reaction boat 8 loaded with raw material powders and reaction products are sequentially connected and communicated to push the push rod of the reaction boat movement. 1. The driving mechanism that can make the push rod reciprocate and linearly move is composed of a support frame 13 that supports the feeding chamber 2, the preheating chamber 4, the reaction chamber 10, the heat insulation chamber 13, the cooling chamber 15 and the driving mechanism;

[0049]The top of the feeding chamber 2 is provided with a feeding port and is equipped with a cover plate 3 covering the feeding port, and the end of the feeding chamber is provided with a push rod inlet and outlet hole; the wall of the preheating chamber is e...

Embodiment 2

[0061] In this embodiment, the difference between the push type dynamic continuous sintering device and the sintering device described in Embodiment 1 is that the length L1 of the preheating chamber 4 is 2 m, the length L2 of the reaction chamber 10 is 2 m, and the length L3 of the cooling chamber 15 The length L4 of the heat insulation chamber 13 is 0.6m. The heat devices in the preheating chamber and the reaction chamber are infrared heating devices, and the heat insulation board covering the boat body is made of graphite.

[0062] In this example, Ti(C 0.3 ,N 0.7 ) The push-type dynamic continuous preparation method process steps of the powder are as follows:

[0063] (1) Ingredients

[0064] The raw materials are nano TiO, micron carbon black powder, according to Ti(C 0.3 ,N 0.7 ) The chemical formula of the powder and the chemical reaction between the raw materials used are used to calculate the molar percentage of each raw material:

[0065] TiO powder: carbon black...

Embodiment 3

[0071] In this embodiment, the difference between the push-type dynamic continuous sintering device and the sintering device described in Embodiment 1 is that the length L1 of the preheating chamber 4 is 2 m, the length L2 of the reaction chamber 10 is 3 m, and the length L3 of the cooling chamber 15 The length L4 of the heat insulation chamber 13 is 0.6m, and the thermal devices in the preheating chamber and the reaction chamber are induction heating devices.

[0072] In this example, Ti(C 0.9 ,N 0.1 ) The push-type dynamic continuous preparation method process steps of the powder are as follows:

[0073] (1) Ingredients

[0074] The raw materials are nano TiO, micron carbon black powder, according to Ti(C 0.9 ,N 0.1 ) The chemical formula of the powder and the chemical reaction between the raw materials used are used to calculate the molar percentage of each raw material:

[0075] TiO 2 Powder: activated carbon powder = 1:2.8

[0076] (2) mixing and drying (with embod...

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Abstract

The invention discloses a pushing type dynamic continuous preparing method for My(CXN1-X) powder. In the chemical formula My(CxN1-x), M is one of Ti, Cr, V, Ta, Mo, Nb, Zr, Hf, W and Mn, y is 1 or 2, and x is larger than or equal to 0.1 but smaller than or equal to 0.9. The preparing method includes the steps that firstly, burdening is conducted; secondly, mixing and drying are conducted; thirdly, sintering is conducted, wherein nitrogenous gas is injected into a cooling room, a reaction room and a preheating room with the gas flow speed of 0.1-8 L / min, the temperature of the preheating room is increased to the preheating temperature, the temperature in the reaction room is increased to the reaction temperature, the cooling room is in the working state, and afterwards, reaction boats loaded with mixed powder are put into a feeding room successively at certain intervals and are intermittently pushed towards a discharging port at a constant speed. The invention further provides a pushing type dynamic continuous sintering device. The single-phase My(CxN1-X) powder can be obtained, and continuous batched production is achieved.

Description

technical field [0001] The invention belongs to the technical field of carbonitride powder preparation, and in particular relates 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082
Inventor 刘颖叶金文安旭光
Owner SICHUAN UNIV
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