Bandyopadhyay, Siddhartha and Mukerji, Joydeb (1988) Sintering and properties of sialons derived from kaolin. Advanced Ceramic Materials, 3 (4). pp. 328-331. ISSN 0883-5551

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Abstract

The sintering behavior of βâ²-sialon (Z = 2) derived from kaolin (AlâOâ{center dot}2SiOâ{center dot}2HâO) without additives is described. The refractoriness of the product increased with increasing nitrogen content. A product of 74% theoretical density was obtained after sintering at 1,700°C a synthesized product having 79.17% theoretical Nâ content. A fully dense product could not be made. The MOR of sintered specimens prepared from samples containing 79.17% theoretical nitrogen content retained it room-temperature strength up to 1,350°C after showing a brief increase to 1,000°C. The total creep strain for the same sample conducted at a load of 18 MN {center dot} mâ»Â² and at a temperature of 1,300°C was 0.06% in 20 h and 2.72% at 1,400°C in 30 h. The oxidation curve increased initially and leveled thereafter. The maximum weight gain at 1,350°C after 72 h was 4 mg/cm². The activation energy was calculated to be 47 kcal/mol. The thermal-expansion coefficient was 2.65 à 10â»â¶/°C from room temperature to 1,000°C. Corrosion in molten aluminum and fluoride baths is described.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Namita Dutta
Date Deposited:	06 Nov 2013 12:45
Last Modified:	06 Dec 2013 07:21
URI:	http://cgcri.csircentral.net/id/eprint/2192

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