Spark plasma sintering of ductile ceramic particles: study of LiF

被引:0
|
作者
R. Marder
C. Estournès
G. Chevallier
S. Kalabukhov
R. Chaim
机构
[1] Technion – Israel Institute of Technology,Department of Materials Science and Engineering
[2] Université de Toulouse,Institut Carnot Cirimat
[3] UPS,Institut Carnot Cirimat
[4] INP,Department of Materials Engineering
[5] CNRS,undefined
[6] Ben-Gurion University of the Negev,undefined
来源
Journal of Materials Science | 2014年 / 49卷
关键词
Flow Stress; Spark Plasma Sinter; Critical Resolve Shear Stress; Spark Plasma Sinter Process; Densification Curve;
D O I
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中图分类号
学科分类号
摘要
Densification of cuboidal micrometer-sized lithium fluoride particles as ductile ceramic by spark plasma sintering (SPS) was investigated. Specimens were fabricated at different pressures and temperature conditions, ranging from 2 to 100 MPa at 500 °C and from 200 to 700 °C under 100 MPa of applied pressure, respectively. Dense specimens of 99 % relative density were fabricated by heating to 500 °C under constant pressure of 100 MPa. The densification showed first compaction by particle rearrangement, followed by plastic deformation via dislocation glide. Hot-pressing models were used to describe the densification by considering the temperature dependences of the yield stress, the strain hardening behavior and coefficients, and the pore size and shape dependences on the applied stress. A good agreement was found between the experimental and the theoretical densification curves. At low pressure of 2 MPa, the densification occurs by particle sliding, assisted by viscous flow at their surfaces, and local plastic deformation at the particle contacts, due to the intensified local stress. Finally, the micrometer-sized structural features and the contiguity achieved by plastic deformation at the start of spark plasma sintering (SPS) nullify any field effects in this model system at higher pressures; good agreement was obtained with expected conventional hot pressing.
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页码:5237 / 5245
页数:8
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