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Processing of a Silicon‐Carbide‐Whisker‐Reinforced Glass‐Ceramic Composite by Microwave Heating
Author(s) -
Chen Lifu,
Leonelli Cristina,
Manfredini Tiziano,
Siligardi Cristina
Publication year - 1997
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.1151-2916.1997.tb03261.x
Subject(s) - whisker , sintering , materials science , silicon carbide , composite number , ceramic , composite material , ball mill , whiskers , monocrystalline whisker , dwell time , microwave , tape casting , metallurgy , microwave oven , medicine , clinical psychology , physics , quantum mechanics
A calcium magnesium aluminosilicate‐based glass that contained 10 wt% of silicon carbide whiskers (SiC w ) as reinforcement was prepared by tape casting, followed by sintering either in a conventional furnace or in a microwave oven. The results were consistent with retardation of glass sintering through whisker bridging. The glass, by itself, was sintered to almost‐full density at 750°C for 4 h by conventional furnace sintering; the best sintered composite, with an estimated density of ∼90%, was obtained at 800°C with a dwell time of 4 h. Sintering at a temperature of >800°C did not improve the densification but rather resulted in severe whisker oxidation. A reduced densification rate was observed for the samples that were sintered in nitrogen. By contrast, in the microwave oven, almost‐full density for the glass and ∼95% of the theoretical density for the composite were obtainable at 850°C for 15 min, which represented a reduction of ∼10 h of the total processing time and a reduced SiC w oxidation.