| Effect of Boron, Boron Carbide and Alumina Additions
on the Sintering of Silicon Carbide |
S. RAMANATAHAN, RAM PRASAD AND C. K. GUPTA
Pages : 77-81
DOI : 10.1080/0371750X.1990.10822999 |
| Abstract |
| The effect of boron, boron carbide and alumina, all with carbon additions,
on the sintering behaviour of silicon carbide powders obtained
by silicon-carbon reaction and silica-carbon reaction was investigated.
The concentrations of these additives-B, B,C, Al20 3 , C-were
varied up to 5 wt %· Sintering investigations were carried out at
2000°C in argon atmosphere. The effectiveness of the additive as a
sintering aid decreased from boron to boron carbide to alumina. In
all these cases, presence of carbon up to 5 wt% was essential. X-ray
diffraction and scanning electron microscopic studies have shown
that the sintered samples with boron and boron carbide additives
existed in the beta phase, while the alumina incorporated specimens
underwent transformation into the 4H-alpha polytype. |
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