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

Stainless steel powder composite material and its warm-pressing method

A composite material and stainless steel technology, applied in the field of powder metallurgy, can solve the problems of poor green strength, low green density, poor formability, etc., and achieve the effect of increasing green density, simple process, and reducing the amount of addition

Inactive Publication Date: 2005-10-05
SOUTH CHINA UNIV OF TECH
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art, especially for the disadvantages of poor formability, low green density and poor green strength of traditional cold-pressed precipitation-hardened stainless steel and its composite material powder, and to provide a Precipitation-hardening stainless steel powder composite material with high density, high green strength, low cost, easy operation and control, and green body is not prone to lamination and its temperature pressing method

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The components of precipitation hardening stainless steel powder and their mass percentage content ranges are as follows: 0.038% carbon, 16.2% chromium, 4.6% nickel, 4.6% copper, 0.55% manganese, 0.30% niobium, 0.09% molybdenum, Composed of 73.62% iron and unavoidable impurity elements. The particle size of the stainless steel powder is ≤74μm.

[0015] In addition, 0.2% lubricant is added according to the total mass of the above components, and the lubricant is a long-chain fatty acid amide. The stainless steel powder with lubricant was mixed on a V-blender for 15 minutes and preheated to 100°C. Electrostatic spraying is used to spray EBS wax on the inner cavity of the mold with a coating thickness of 0.05mm, and the mold is heated to 80°C. Then the powder is filled in the mold and warm pressed under different unit pressures to obtain the following results: the density of the green compact under warm pressing at 500MPa is 5.97g / cm 3 , 0.20g / cm higher than traditional...

Embodiment 2

[0017] The components of the stainless steel powder composite material and their mass percentage content ranges are as follows: 0.047% carbon, 17.03% chromium, 4.02% nickel, 3.97% copper, 0.37% niobium, 74.56% iron; the particle size of the stainless steel powder is ≤ 74 μm. In addition, 10% of niobium carbide with a particle size of 2.5 μm and 0.3% of lubricant are added based on the total mass of the above components. The lubricant is a mixture prepared according to the ratio of lithium stearate:long-chain fatty acid amide=20:80 (mass ratio). The stainless steel composite powder with lubricant was mixed on a V-blender for 50 minutes and preheated to 130 °C. EBS wax was sprayed on the inner cavity of the mold by electrostatic spraying with a coating thickness of 0.03mm, and the mold was heated to 110°C. Then the powder is filled in the mold and warm pressed under different unit pressures, the following results can be obtained: the density of the warm pressed green body at 5...

Embodiment 3

[0019] The components of the stainless steel powder composite material and their mass percentage content ranges are as follows: 0.047% carbon, 17.03% chromium, 4.02% nickel, 3.97% copper, 0.37% niobium, 74.56% iron; the particle size of the stainless steel powder is ≤ 74 μm. In addition, 5% of niobium carbide particles with a particle size of 3 μm and 0.1% of lubricant were added based on the total mass of the above components. The lubricant was lithium stearate. The stainless steel powder composite with lubricant was mixed on a V-blender for 60 minutes and preheated to 80 °C. Electrostatic spraying is used to spray EBS wax on the inner cavity of the mold with a coating thickness of 0.1mm, and the mold is heated to 100°C. Then the powder is filled in the mold and warm pressed under different unit pressures, the following results can be obtained: the density of the warm pressed green body at 500MPa is 5.94g / cm 3 , 0.18g / cm higher than traditional cold pressing 3 ;Density of...

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
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

This invention offers a kind of composite which can deposit sclerotic stainless steel powder and its warm-pressing method. The composite's components and their mass's percentage content is 0.02-0.07%C, 15.0-17.5%Cr, 3.0-5.0%Ni, 3.0-5.0%Cu, 0-0.6%Mn, 0.15-0.45%Nb, 0-0.1%Mo, and others are Fe and inevitable impurity element. Besides, 0-10% of the whole mass said above of NiC granule and 0.1-0.3% anti-friction material are added. This method uses electrostatic spraying to spray EBS wax powder onto the bore of the die to make the die wall greasing, and the thickness of the paintcoat is between 0.01mm and 0.1mm. The density of the green ware body shaped by warm-pressing is 0.15-0.25g / cm3 higher than the body shaped by cold-pressing, while the intensity increases by 6.2-15%. The characteristics of this invention are high density, low cost, easy operation and that the lamination crack is not easy to happen. So it can largely improve the density and intensity of stainless steel powder composite parts' green ware body. In a word, it can be widely used in the parts production of mechanics, car and chemical industry.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a stainless steel powder composite material for manufacturing high-density and high-strength powder metallurgy parts and a warm-pressing method thereof. Background technique [0002] The advantage of using the traditional powder metallurgy method to produce stainless steel parts is that it can produce final shape or near-net shape powder metallurgy parts at a lower cost, which can realize less cutting and no machining, but the disadvantage is that the density of the parts is not high, and the corrosion resistance and mechanical properties are relatively high. lower. Although the density of isostatic pressing and injection molding parts is high, their application is greatly limited due to the complicated process and high cost. The warm-pressing technology, which was successfully developed in the 1990s and has been industrialized, not only overcomes the disa...

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 Applications(China)
IPC IPC(8): B22F3/04C22C1/05C22C38/48
Inventor 李元元肖志瑜陈平邵明张文
Owner SOUTH CHINA UNIV OF TECH
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