기공형성제 PMMA와 WO3 분말 성형체의 열처리를이용한 W 다공체 제조

Title
기공형성제 PMMA와 WO3 분말 성형체의 열처리를이용한 W 다공체 제조
Other Titles
Fabrication of Porous W by Heat Treatment of Pore Forming Agent of PMMA and WO3 Powder Compacts
Authors
김영도
Keywords
Porous W; Pore forming agent; Hydrogen reduction of WO3; Pore structure
Issue Date
2015-04
Publisher
한국분말야금학회
Citation
한국분말야금학회지, v. 22, NO 2, Page. 129-133
Abstract
Porous W with controlled pore structure was fabricated by thermal decomposition and hydrogen reduction process of PMMA beads and WO3 powder compacts. The PMMA sizes of 8 and 50 μm were used as pore forming agent for fabricating the porous W. The WO3 powder compacts with 20 and 70 vol% PMMA were prepared by uniaxial pressing and sintered for 2 h at 1200oC in hydrogen atmosphere. TGA analysis revealed that the PMMA was decomposed at about 400oC and WO3 was reduced to metallic W at 800oC. Large pores in the sintered specimens were formed by thermal decomposition of spherical PMMA, and their size was increased with increase in PMMA size and the amount of PMMA addition. Also the pore shape was changed from spherical to irregular form with increasing PMMA contents due to the agglomeration of PMMA in the powder mixing process.
URI
http://ejournal.kpmi.or.kr/journal/article.php?code=22287http://hdl.handle.net/20.500.11754/23839
ISSN
1225-7591; 2287-8173
DOI
http://dx.doi.org/10.4150/KPMI.2015.22.2.129
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ETC
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