Production of metal powder compact with controlled porosity by spark plasma sintering process

Proceedings KORUS 2000. The 4th Korea-Russia International Symposium On Science and Technology Pub Date : 2000-06-27 DOI:10.1109/KORUS.2000.866100

Sung-ki Kim, H. Kim, Ji-soon Kim, Young-Soon Kwon

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引用次数: 3

Abstract

Spark plasma sintering (SPS) is a new process for sintering of various kinds of materials. The SPS method was tested in the fabrication of porous materials having high strength and porosity. 316L stainless steel powders classified (44-63 /spl mu/m and 63-75 /spl mu/m) were used as raw materials. After inserting and tapping of powder in a cylindrical graphite mold with inner diameter of 15 mm, SPS was performed in the temperature range of 600-1000/spl deg/C for 1 min with heating rate of 100/spl deg/C/min in vacuum atmosphere and applied pressure of 15 MPa. The apparent porosity of specimens decreased from about 55% to 31% with increase of sintering temperature from 600 to 1000/spl deg/C. Deep dimple traces of ductile fracture were observed on fracture surfaces of sintered bodies with high sintering temperature (900-1000/spl deg/C) due to the strong neck formation and growth. Using alumina supporter and through control of punch length, porosity could be controlled from about 53% to 40% at a sintering temperature of 900/spl deg/C, and the hardness value was increased.

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用火花等离子烧结法制备孔隙度可控的金属粉末压块

火花等离子烧结(SPS)是一种用于烧结各种材料的新工艺。在制备高强度、高孔隙率的多孔材料中对SPS方法进行了试验。以316L不锈钢粉(44-63 /spl μ m和63-75 /spl μ m)为原料。粉末在内径为15 mm的圆柱形石墨模具中插入、攻丝后，在真空气氛下，在600-1000/spl℃范围内，加热速率为100/spl℃/min，施加压力为15 MPa, SPS进行1 min。随着烧结温度从600℃升高到1000℃，试样的表观孔隙率从55%左右下降到31%左右。在烧结温度较高(900 ~ 1000℃)的烧结体中，由于颈部的形成和生长，断口表面出现了深韧窝的韧性断裂痕迹。在烧结温度为900℃/spl℃时，采用氧化铝支撑体，通过控制冲孔长度，可将孔隙率控制在53% ~ 40%左右，硬度值得到提高。

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Proceedings KORUS 2000. The 4th Korea-Russia International Symposium On Science and Technology

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