Texture development in Si3N4/BN fibrous monolithic ceramics

被引：0
作者：
S. Y. Lienard
D. Kovar
R. J. Moon
K. J. Bowman
J. W. Halloran
机构：
[1] University of Texas at Austin,Texas Materials Institute and Department of Mechanical Engineering
[2] University of Texas at Austin,Texas Materials Institute and Department of Mechanical Engineering
[3] Purdue University,Department of Materials Engineering
[4] University of Michigan,Department of Materials Science and Engineering
来源：
Journal of Materials Science | 2000年 / 35卷
关键词：
Polymer; Prefer Orientation; Basal Plane; Ceramic Composite; Texture Development;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Preferred orientation was measured in Si3N4/BN fibrous monolithic ceramics using x-ray diffraction. The materials were manufactured by co-extrusion of polymer binder/ceramic blends which were subsequently pyrolized and then hot-pressed to produced a fully dense ceramic composite. A very strong modified wire texture was present in the BN with the basal planes aligned parallel to the axis of extrusion due to shear-induced reorientation of the platelet-shaped BN particles during co-extrusion. Texture was also observed in the Si3N4 and was attributed to a combination of co-extrusion and hot-pressing. After hot pressing, the basal planes of the rod-shaped β-Si3N4 were observed to be preferentially aligned perpendicular to the extrusion direction. Measurements prior to hot-pressing revealed that a small amount (≈5%) of β-Si3N4 was present in the α-Si3N4 starting powder. Although texturing of the predominant α-Si3N4 did not occur during co-extrusion, significant texturing of the β-Si3N4 was observed. During subsequent hot-pressing, the pre-existing textured β-Si3N4 particles appeared to act as seeds for transformation and preferred growth of rod-shaped β grains parallel to the axis of extrusion.
引用
收藏
页码：3365 / 3371
页数：6
相关论文
共 52 条
  • [1] Kovar D.(1997)undefined J. Amer. Ceram. Soc. 80 2471-undefined
  • [2] King B. H.(1998)undefined J. Amer. Ceram. Soc. 81 1004-undefined
  • [3] Trice R. W.(1999)undefined J. Amer. Ceram. Soc. 82 2943-undefined
  • [4] Halloran J. W.(1995)undefined J. Amer. Ceram. Soc. 78 1687-undefined
  • [5] Kovar D.(1993)undefined J. Amer. Ceram. Soc. 76 1793-undefined
  • [6] Thouless M. D.(1993)undefined J. Amer. Ceram. Soc. 76 2209-undefined
  • [7] Halloran J. W.(1995)undefined Mat. Sci. Eng. A A915 263-undefined
  • [8] Trice R. W.(1993)undefined J. Amer. Ceram. Soc. 76 1420-undefined
  • [9] Halloran J. W.(1995)undefined J. Eur. Ceram. Soc. 15 283-undefined
  • [10] Hirao K.(1997)undefined J. Amer. Ceram. Soc. 80 1181-undefined
123456