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Novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel and preparation method thereof

A technology of powder metallurgy and dispersion strengthening, which is applied in the field of near-net shape technology, can solve problems such as refractory melting, atomization, and deterioration of material toughness, achieve fine structure, improve wear resistance and oxidation resistance, and facilitate development and trial use Effect

Active Publication Date: 2018-10-12
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of vacuum melting-electroslag remelting and gas atomization processes in traditional powder metallurgy high-speed steel, when introducing high melting point hard points or more alloying elements, the required higher melting temperature makes the existing equipment (heat-resistant parts withstand temperature Generally less than 1850°C) It is difficult to completely melt and atomize molten steel
Therefore, it is difficult for traditional powder metallurgy high-speed steel to introduce AlN particles for strengthening, and when the high-speed steel atomized alloy powder and AlN powder are mixed for supersolid-phase liquid-phase sintering, alloy ledeburite and AlN particles along the grain boundary are prone to occur. Chain distribution, resulting in sharp deterioration of the toughness of the material

Method used

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  • Novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel and preparation method thereof
  • Novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel and preparation method thereof
  • Novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) 6.39wt.% WC powder with a particle size of 0.05-10 microns and an oxygen content less than 0.1%, 5.31wt.% Mo 2 C powder, 4.62wt.%Cr 3 C 2 powder, 3.71wt.% VC powder, 8.0wt.% Co powder, 0.05wt.% AlN powder, 1.21wt.% carbon powder and 70.71wt.% carbonyl iron powder are mixed and wet milled in a drum mill, and the ball milling medium is Dehydrated alcohol, cemented carbide balls are grinding balls, the ball-to-material ratio is 4:1, and the ball milling time is 24 hours to prepare the powder mixture slurry;

[0032] 2) Stir and dry the mixed powder slurry obtained in step 1 in a stirring dryer at a temperature of 75°C until the liquid is completely evaporated, then put the powder into a sieve granulator, add 1% stearic acid and an appropriate amount of alcohol for drying Sieve granulation;

[0033] 3) Press the mixed powder under an automatic press at 300Mpa, hold the pressure for 30s, then carry out hydrogen degreasing, deoxygenation and pre-calcination, and then ca...

Embodiment 2

[0037] 1) 10.66wt.% WC powder with a particle size of 0.05-10 microns and an oxygen content of less than 0.1%, 5.31wt.% Mo 2 C powder, 3.46wt.%Cr 3 C 2 powder, 11.74wt.% VC powder, 9.0wt.% Co powder, 0.25wt.% AlN powder, 3.2wt.% carbon powder and 56.23wt.% carbonyl iron powder are mixed and wet milled in a drum mill, and the ball milling medium is Dehydrated alcohol, cemented carbide balls are grinding balls, the ball-to-material ratio is 3:1, and the ball milling time is 26 hours to prepare the powder mixture slurry;

[0038] 2) Stir and dry the mixed powder slurry obtained in step 1 in a stirring dryer at a temperature of 80°C until the liquid is completely evaporated, then put the powder into a sieve granulator, add 1% stearic acid and an appropriate amount of alcohol for drying Sieve granulation;

[0039] 3) Press the mixed powder under the automatic press at 280Mpa, hold the pressure for 30s, then carry out hydrogen degreasing, deoxidation and pre-calcination, and then...

Embodiment 3

[0043] Present embodiment takes following technical scheme:

[0044] 1) 2.13wt.% WC powder with particle size of 0.05-10 microns and oxygen content less than 0.1%, 3.19wt.% Mo 2 C powder, 9.23wt.%Cr 3 C 2 Powder, 6.18wt.% VC powder, 2.0wt.% Co powder, 5.0wt.% AlN powder, 0.8wt.% carbon powder and 71.47wt.% carbonyl iron powder are wet milled and mixed in a drum mill, and the ball milling medium is Dehydrated alcohol, cemented carbide balls are grinding balls, the ball-to-material ratio is 2:1, and the ball milling time is 27 hours to prepare the powder mixture slurry;

[0045] 2) Stir and dry the mixed powder slurry obtained in step 1 in a stirring dryer at a temperature of 75°C until the liquid is completely evaporated, then add 1% stearic acid and an appropriate amount of alcohol for sieving and granulation;

[0046] 3) Press the mixed powder under an automatic press at 400Mpa, hold the pressure for 30s, then carry out hydrogen degreasing, deoxidation and pre-calcination,...

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Abstract

The invention discloses novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel and a preparation method thereof. Aluminum high-speed steel prepared by the preparation method adopts a novel powder metallurgical high-speed steel direct preparation process to lead in (0.05-5.0) AlN micro powder, and a material mixture is subjected to processes such as wet-milling, pelletizing, isostatic cool pressing and forming, hydrogen gas deoxidizing, hot-pressing composite sintering and vacuum thermal treatment, so that micro-level dispersion distribution of aluminum nitride particles is realized, and therefore, the defects that a conventional casting process easily generates a ledeburite structure, an aluminum nitride strengthening phase is difficulty led in by agas-atomizing-hot isostatic pressing method, and the like are overcome. The novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel is short in process flow, islow in production cost, is low in impurity content, is high in compactness, and is remarkably improved in wear resistance, oxidization resistance and a micro structure after aluminum nitride is led in, and is novel mould material among conventional high-speed steel, a hard alloy and a ceramic material.

Description

technical field [0001] The invention relates to a new type of powder metallurgy high-speed steel, that is, aluminum nitride dispersion-strengthened oxidation-resistant powder metallurgy aluminum high-speed steel, as well as its preparation method and near-net forming process. technical background [0002] High-speed steel can be divided into high-end powder metallurgy high-speed steel and ordinary cast and forged high-speed steel. The former has anisotropy and Excellent comprehensive mechanical properties. However, my country does not have the production capacity of high-end powder metallurgy high-speed steel so far. This is mainly due to its long production process, large equipment investment, and high technical threshold, involving core equipment and technologies such as electroslag remelting, gas atomization, and hot isostatic pressing. Today, powder metallurgy high-speed steel has gone through three generations, and the optimization of impurity content and alloying sch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/24C22C38/30C22C38/36C22C33/02C21D6/00C21D1/18C22C30/00C22C1/05C22C1/10C22F1/00
CPCC21D1/18C21D6/002C22C1/05C22C30/00C22C33/006C22C33/02C22C38/22C22C38/24C22C38/30C22C38/36C22F1/00C22F1/002
Inventor 张乾坤李苏望肖逸锋吴靓钱锦文罗水金陈永俊陈豫章
Owner XIANGTAN UNIV
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