航空学报 > 1992, Vol. 13 Issue (10): 564-566

ZTA复合材料的热等静压研究

唐国宏1, Telle Rainer2   

  1. 1. 北京航空航天大学101教研室 北京 100083;2. 德国马普金属所
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1992-10-25 发布日期:1992-10-25

HOT ISOSTATIC PRESSING OF ZTA COMPOSITES

Tang Guo-hong1, Telle Rainer2   

  1. 1. Facultv 101 of Beijing Universitv of Aeronautics and Astronautics, Beijing, 100083;2. Max-Planck Institute of Metal Science Germany
  • Received:1900-01-01 Revised:1900-01-01 Online:1992-10-25 Published:1992-10-25

摘要:

研究了热等静压对Al2O3-ZrO2复合材料机械性能的影响以及热等静压烧结过程中ZTA的致密化规律。经实验热等静压烧结的ZTA材料与相应的热压试样相比,其强度和韧性提高近一倍(σb=950MPa、Klc=9.5MPa √m);在不同的烧结温度下,显示了不同的致密化规律,其致密人速率分别由晶粒滑动和点阵扩散机制控制。

关键词: 热等静压, 缺陷尺寸, 缺陷尺寸, 断裂韧性, 致密化

Abstract:

In this study, the influence of a reduction of both grain size and flaw size by hot isostatic pressing (HIP) on mechanical preperties of Al2O3-ZrO2(ZTA) composites and as well the dinsification behavior in HIP are investigated. It is shown that the high strength (950MPa) and high toughness ( 0.5MPa √m) could be obtained by a high temperature-short time HIP treatment, and the main effect of HIP is in the elimination of flaws rather than in the reduction of gram size, i.e. defect healing; the densification rate in HIP is controlled by different mechanisms at low and high temperatures(1400℃ and 1600℃ ),i.e. by relative movement of adjacent grains and lattice diffusion.

Key words: HIP, grain size, flaw size, toughness, densification rate