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热压烧结制备纳米Y-TZP材料 被引量:13

Sintering of Nano Y-TZP Materials by Hot-pressing
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摘要 本文研究了热压烧结制备纳米Y-TZP材料的过程.研究结果表明:热压烧结纳米Y-TZP材料有一些新的特点,主要是纳米Y-TZP材料在热压烧结时,由于软团聚未能有效地破碎;造成烧结过程中团聚体内部首先致密化,与基体之间产生张力,导致裂纹状大气孔的出现.同时因石墨模具的限制,热压时的外压不足以克服塑性滑移产生所需的“阈值”,因此大气孔无法“压碎”,使材料的烧结密度比相同温度下无压烧结还低.针对热压烧结纳米Y-TZP材料的局限性,采用热煅压烧结,可在1100℃的低温下获得致密的纳米Y-TZP材料,晶粒大小仅85nm左右。 The processing of synthesizing nano Y-TZP materials by hot-pressing was investigated. It was found that there were large crack-like pores in the sintered samples. The reason of this new phenomena was that the soft agglomerate in the powder was not efficiently destroyed. When sintered, the soft agglomerate sintered quickly and turned into hard agglomerate, as a result of the interaction between the hard agglomerate and the matrix, large pores formed. On the other hand, the applied pressure was limited because the low stress tolerance of the graphite die, so no plastic displacement could happen and those large pores could not be 'squashed' , As a result, the density of the samples sintered by hot-pressing was lower than that by pressureless sintering at the same sintering temperature. To overcome this shortage of hot-pressing, sinter-forging was applied and nano Y-TZP materials with grain size of about 85um and relative density of 99% could be obtained when sintered at 1100℃.
出处 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2000年第4期607-611,共5页 Journal of Inorganic Materials
关键词 热压烧结 纳米材料 Y-TZP 陶瓷 hot-pressing nano structured materials Y-TZP
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参考文献2

  • 1李蔚,无机材料学报,1999年,15卷,2期,269页
  • 2Shi J L,J Mater Sci,1993年,28卷,2期,342页

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