A new route for the synthesis of WC-Al2O3 composite free from unwanted W2C phase through mechano-chemical treatment of WO3-xAl-y(4 - 1.5x)C mixture has been investigated. It has been concluded that by substitution of 10 mol% of 2 mol Al (x = 1.8) with equivalent stoichiometric amount of C together with 20 mol% excess carbon addition (y = 1.2), i.e., using a WO3:1.8Al:1.56C initial mixture, W2C free WC-Al2O3 composite can be successfully obtained by about 6 h milling. Crystallite size and lattice strain of the WC-Al 2O3 composite synthesized in the present study as well as those obtained by the previous successful routes have been reported. The results revealed that a powder whose synthesis route involves lower adiabatic temperature as well as longer milling time would have a smaller crystallite size and higher lattice strain. Furthermore, TEM observations showed that all synthesized powders contain the agglomerates which consist of nano-size particles.
|ジャーナル||Materials Research Bulletin|
|出版ステータス||Published - 2014 1 1|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering