| 引用本文: | 余娇,杜玉洁,钟浩,周芸,左孝青.挤压316L金属蜂窝的烧结及其组织性能研究[J].材料科学与工艺,2014,22(4):81-85.DOI:10.11951/j.issn.1005-0299.20140414. |
| YU Jiao,DU Yujie,ZHONG Hao,ZHOU Yun,ZUO Xiaoqing.Investigation on sintering processing, structure and property of 316L honeycombs fabricated by extruding[J].Materials Science and Technology,2014,22(4):81-85.DOI:10.11951/j.issn.1005-0299.20140414. |
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| 摘要: |
| 以金属粉末、粘结剂为原料,经炼料制成膏状挤压料,通过挤压模成型为蜂窝状,再经高温烧结制备成316L不锈钢蜂窝.研究了烧结气氛、烧结温度对蜂窝烧结组织结构的影响,并对烧结后的蜂窝进行力学性能测试.结果表明,在氢气中烧结的316L蜂窝组织,金属颗粒间形成烧结颈,呈网状连接在一起,并随温度升高颗粒合并长大成晶粒,基体组织为Fe-Cr-Ni-C(γ-Fe)固溶体,第二相球形颗粒为富含硅的低熔点化合物；在真空中烧结,金属颗粒表面形成氧化物Fe2Cr4O4、 Cr2O3,以及SiO2,大量的表面氧化物阻碍了金属粉末颗粒的结合,直接影响烧结蜂窝的强度,致使烧结蜂窝强度远低于氢气中烧结的蜂窝.在氢气中烧结的316L金属蜂窝,其径向抗压强度可达40～50 MPa,远高于目前广泛应用的陶瓷蜂窝载体,是作为载体材料的一种理想选择. |
| 关键词: 316L不锈钢 金属蜂窝 挤压 烧结 载体材料 |
| DOI：10.11951/j.issn.1005-0299.20140414 |
| 分类号:TB383 |
| 基金项目:国家自然科学基金资助项目(51264024);云南省自然科学基金重点项目(2010CC004);云南省新材料制备与加工重点实验室重点基金资助项目(2DS2010010A). |
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| Investigation on sintering processing, structure and property of 316L honeycombs fabricated by extruding |
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YU Jiao,DU Yujie, ZHONG Hao, ZHOU Yun, ZUO Xiaoqing
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(Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China)
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| Abstract: |
| Pure 316L powder is used to mix with an additive to prepare a powder mixed paste by which the 316L stainless honeycombs are extruded through a die, then dried and sintered at high temperature. The effect of sintering atmosphere and sintering temperature on the microstructure of honeycombs has been studied, and mechanical property is measured by radial compression. The results show that the metal particles sintered in hydrogen atmosphere contact to form sintering neck, and with the temperature increase, the particles merge into a grain, the microstructure of sintering honeycombs is composed of γ-Fe matrix and second phase of spherical particles of low melting point compounds containing silicon. If sintered in vacuum, the oxides of Fe2Cr4O4, Cr2O3, and SiO2 form on the surface of metal particles to stop the combination of metal powder particles, so the honeycomb strength is much lower than that in the hydrogen atmosphere. The strength of 316L metal honeycomb sintered in hydrogen atmosphere reaches 40~50 MPa, far higher than that of ceramic honeycomb used current widely. The 316L metal honeycomb is a kind of ideal material for catalytic carrier. |
| Key words: 316L stainless steel metallic honeycomb extruding-sintering |
