Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Aluminum nitride dispersion strengthened powder metallurgy aluminum high speed steel and preparation method thereof

A powder metallurgy and dispersion strengthening technology, applied in the field of powder metallurgy high-speed steel, can solve the problems of material toughness deterioration, refractory melting and atomization, and achieve the effects of avoiding chain distribution, inhibiting growth, and refining the structure.

Active Publication Date: 2020-11-03
XIANGTAN UNIV
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Aluminum nitride dispersion strengthened powder metallurgy aluminum high speed steel and preparation method thereof
  • Aluminum nitride dispersion strengthened powder metallurgy aluminum high speed steel and preparation method thereof
  • Aluminum nitride dispersion strengthened powder metallurgy aluminum high speed steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) 6.39wt.% WC powder, 5.31wt.% Mo2C powder, 4.62wt.% Cr3C2 powder, 3.71wt.% VC powder with a particle size of 0.05-10 microns and an oxygen content less than 0.1%, 8.0wt.% Co powder, 0.05wt.% AlN powder, 1.21wt.% carbon powder, and 70.71wt.% carbonyl iron powder were mixed and wet-milled in a roller ball mill. The ball milling medium was absolute ethanol, and the cemented carbide ball was a ball. The material ratio is 4:1, the ball milling time is 24 hours, and the powder mixture slurry is prepared;

[0033] 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;

[0034] 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 carry out p...

Embodiment 2

[0038] 1) 10.66wt.% WC powder, 5.31wt.% Mo2C powder, 3.46wt.% Cr3C2 powder, 11.74wt.% VC powder, 9.0wt.% with particle size of 0.05-10 microns and oxygen content less than 0.1% Co powder, 0.25wt.% AlN powder, 3.2wt.% carbon powder, and 56.23wt.% carbonyl iron powder are mixed and wet-milled in a drum-type ball mill. The material ratio is 3:1, the ball milling time is 26 hours, and the powder mixture slurry is prepared;

[0039] 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;

[0040] 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 carry out pressure sintering.

[0041] 4) Heat treatment: The heat treatment process is: first stage ...

Embodiment 3

[0044] This embodiment takes the following technical solutions:

[0045] 1) 2.13wt.% WC powder, 3.19wt.% Mo2C powder, 9.23wt.% Cr3C2 powder, 6.18wt.% VC powder, 2.0wt.% with particle size of 0.05-10 microns and oxygen content less than 0.1% Co powder, 5.0wt.% AlN powder, 0.8wt.% carbon powder and 71.47wt.% carbonyl iron powder were wet-milled and mixed in a roller ball mill. The material ratio is 2:1, the ball milling time is 27 hours, and the powder mixture slurry is prepared;

[0046] 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;

[0047] 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, and then carry out pressure sintering, the sintering temperature is 1130°C, heat preservation...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

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 powder metallurgy high-speed steel, that is, an aluminum nitride dispersion-strengthened oxidation-resistant powder metallurgy aluminum high-speed steel, as well as a preparation method and a near-net forming process thereof. [0002] technical background [0003] 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 alloy...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com