Premium
Synthesis‐Fabrication of an Al 2 O 3 ‐Tungsten Carbide Composite
Author(s) -
CRAYTON PHILIP H.,
GREENE EDWARD E.
Publication year - 1973
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1973.tb12715.x
Subject(s) - tungsten carbide , tungsten , composite number , hot pressing , materials science , carbide , microstructure , carbon fibers , phase (matter) , fabrication , relative density , metallurgy , composite material , chemistry , medicine , alternative medicine , organic chemistry , pathology
A composite of 70 vol% Al 2 O 3 and 30 vol% tungsten carbide was formed by hot‐pressing. Simultaneously carbon reacts with an intimate mixture of WO 3 and Al 2 O 3 to form a dense body. The composite approached theoretical density; a 1‐ to ‐10‐μm carbide phase was uniformly dispersed in a 2‐μm Al 2 O 3 matrix. Maximum density and fine‐grained microstructure were obtained when pressure was applied during heating from 1200° to 1600°C and temperature and pressure were then maintained for 20 min. At an initial ratio of 2.8 and 2.9 mol C/mol WO 3 , the tungsten appeared as free W, WC, and W 2 C. For C/WO 3 =3.0 to 3.6, mixtures of W 2 C and WC were present, whereas for C/WO 3 >3.6, free C appeared with WC. The effects of the hot‐pressing parameters are discussed.