ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Consolidation of pyrolyzed powders has been tried by hot isostatic pressing (HIP) withoutsintering additives, in order to obtain dense non-oxide ceramic bulk materials derived from polymerprecursors. Si1.0C1.6N1.3 ceramic powders were derived from a polyvinylsilazane polymer. Thepolymer was thermally crosslinked at 250oC and pyrolyzed at 1050oC under Ar atmosphere. Thepyrolyzed powders were die-pressed into rectangular bars at room temperature and densified by HIPat 1400oC-900 MPa and 1500oC-950 MPa. Dense ceramic monolith, in which pores were notobserved by optical microscopy, was obtained by the HIP consolidation at 1500oC-950 MPa. Themicrostructure of the ceramic monolith was a nano-composite structure consisted of α-Si3N4 andgraphite phases. In the compression tests of the HIP-treated sample, slight plastic deformation wasobserved at 1400 and 1500oC in spite of high compressive stress over 1000 MPa. On the other hand,the sample showed a compressive strain of about 7% at 1000 MPa at 1600oC. The compressive strainof about 11% was achieved at 1700oC
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.15.pdf
