TY - JOUR
T1 - Sintering behaviour and properties of SiCAION ceramics
AU - Huang, Jow-Lay
AU - Hurford, Andrew C.
AU - Cutler, Raymond A.
AU - Virkar, Anil V.
PY - 1986/4/1
Y1 - 1986/4/1
N2 - Silicon carbide (SiC), aluminium oxycarbide (AI2OC), and aluminium nitride (AlN) all have the same wurtzite crystal structure and can be processed so as to form SiCAION, an acronym for the solid solution. This paper describes processing of SiC-Al2OC ceramics by pressureless reactive sintering and gives mechanical property data on the same. Experiments showed that densification occurred by a liquid-phase sintering mechanism. Both alpha and beta SiC up to a particle size of 5 μm were used to form the solid solution, boron additions were not necessary to promote densification, and densities greater than 97% of the theoretical were achieved by pressureless sintering. SiC-Al2OC ceramics, containing minor amounts of AIN, were fabricated from conventional raw materials. Phase identification by X-ray diffraction and metallography showed that the materials consisted of two phases: SiCAION and SiC. Mechanical property data were obtained on pressureless sintered and hot-pressed materials. Hot-pressed materials had room-temperature strengths in excess of 600 MPa, hardness greater than 25 G Pa, and fracture toughness greater than 4 M Pa m-1/2. Pressureless sintered bars had bend strengths in excess of 300 M Pa.
AB - Silicon carbide (SiC), aluminium oxycarbide (AI2OC), and aluminium nitride (AlN) all have the same wurtzite crystal structure and can be processed so as to form SiCAION, an acronym for the solid solution. This paper describes processing of SiC-Al2OC ceramics by pressureless reactive sintering and gives mechanical property data on the same. Experiments showed that densification occurred by a liquid-phase sintering mechanism. Both alpha and beta SiC up to a particle size of 5 μm were used to form the solid solution, boron additions were not necessary to promote densification, and densities greater than 97% of the theoretical were achieved by pressureless sintering. SiC-Al2OC ceramics, containing minor amounts of AIN, were fabricated from conventional raw materials. Phase identification by X-ray diffraction and metallography showed that the materials consisted of two phases: SiCAION and SiC. Mechanical property data were obtained on pressureless sintered and hot-pressed materials. Hot-pressed materials had room-temperature strengths in excess of 600 MPa, hardness greater than 25 G Pa, and fracture toughness greater than 4 M Pa m-1/2. Pressureless sintered bars had bend strengths in excess of 300 M Pa.
UR - http://www.scopus.com/inward/record.url?scp=0022698929&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0022698929&partnerID=8YFLogxK
U2 - 10.1007/BF00553287
DO - 10.1007/BF00553287
M3 - Article
AN - SCOPUS:0022698929
VL - 21
SP - 1448
EP - 1456
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 4
ER -