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Sinter-hardening powder and their sintered compacts

A sintering hardening, powder technology, applied in the field of sintering hardening powder, can solve the problems of poor sintering density, poor compressibility mold wear, and reduced sinterability

Inactive Publication Date: 2010-08-11
TAIWAN POWDER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pre-alloyed powders have many disadvantages, such as when pre-alloyed powders are used in compaction methods, the hardening effect of alloying elements can cause poor compressibility and severe wear to the die
In addition, because the elements in the pre-alloyed powder have been homogenized, the sinterability is reduced and the sintered density is poor

Method used

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  • Sinter-hardening powder and their sintered compacts
  • Sinter-hardening powder and their sintered compacts
  • Sinter-hardening powder and their sintered compacts

Examples

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example 1

[0036]Following the composition of samples 1 and 2 listed in Table 2, water atomized iron powder was mixed with fine elements Ni, Mo, Cu and graphite powder, 0.8% zinc stearate (used as lubricant) and fine Fe-Cr or Fe-Si pre-alloyed powder mixing. The mixture was pressed, de-lubricated at 550°C for 15 minutes, and then sintered at 1200-1250°C. Sample Nos. 3, 4 and 5 used Fe-3Cr-0.5Mo as the base powder to which lubricant, elemental Ni, Cu powder, graphite powder and fine Fe-Mn pre-alloyed powder were added. Sample No. 6 was prepared by mixing lubricant, elemental Ni and graphite powders, and Fe-1.5Cr-0.2Mo pre-alloyed powders. To prepare samples Nos. 7, 8 and 9, 50% Fe-3Cr-0.5Mo powder and 50% Fe-1.5Cr-0.2Mo powder were mixed and then used as base powder. Different amounts of Ni and graphite powders were subsequently added to the base powder. The average particle size of the base powder is between 50 μm and 100 μm. All of these samples in Table 2 were sintered to approxima...

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Abstract

The invention relates to a sinter-hardening raw powder and a sintered compact thereof. The sinter-hardening raw powder can yield a press-and-sinter compact with high hardness. The raw powder for sintering includes Fe as its primary component and also includes 0.3-0.8 wt % C, 5.0-12.0 wt % Ni, 1.0-5.0 wt % Cr, and 0.1-2.0 wt % Mo, wherein the mean particle size of the raw powder for sintering is between 50 and 100 mum. The sintered-tempered compact has high hardness without performing the quenching process.

Description

technical field [0001] The present invention relates to a sinter hardening powder, in particular to a sinter hardening raw material powder and its sintered green body for producing a high hardness composition in a sintered part through a powder metallurgy process. Background technique [0002] In order to obtain high hardness, most sintered parts require heat treatment (such as quenching) to form martensite. However, while quenching is performed, several factors such as deformation, dimensional inconsistencies, or cracks may occur due to volume expansion when the part transforms from austenite to martensite or thermal stress due to rapid cooling of the quenching process. question. Additionally, performing heat treatment on the part incurs additional costs. Therefore, a sinter hardened powder is formed by adding carbon and high hardenability alloying elements such as molybdenum, nickel, manganese, and chromium to iron powder in a press sintering process, and then pressed in...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/10C22C1/05C22C33/02
Inventor 黄坤祥陆永忠
Owner TAIWAN POWDER TECH CO LTD
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