Evaluation Of The Ml Lute Hypothesis In Respect Of Electrotec Hnical Porcelains

Archives of Metallurgy and Materials

P. Ranachowski¹  F. Rejmund¹  Z. Ranachowski¹  S. Kudela Jr²  A. Piątkowski³  A. Pawełek³ 

[1] INSTITUTE OF FUNDAMENTAL TECHNOLOGICAL RESEARCH PAS, 5B PAWINSKIEGO STR., 02-106 WARSZAWA, POLAND;INSTITUTE OF MATERIALS AND MACHINE MECHANICS SAS, SK-831 02 BRATISLAVA, 75 RACIANSKA STR., SLOVAK REPUBLIC;INSTITUTE OF METALLURGY AND MATERIALS SCIENCES PAS, 25 REYMONTA STR., 30-059 KRAKÓW, POLAND

关键词: Keywords: electrotechnical porcelain;    porcelain degradation;    acoustic emission (AE);    microscopic analysis;   

DOI  :  10.2478/amm-2013-0158

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The paper presents the evaluation of the mullite hypothesis explaining the strength of porcelains. There was researched the influence of the mullite phase on the short- and long-term mechanical strength of electrotechnical porcelain of different types (C 110, C 112, C 120 and C 130). The total mullite phase content, the size and distribution of precipitates and dispersed single crystals in the glassy matrix were considered. Mechanoacoustic and microscopic techniques as well as ultrasonic testing were used during the investigation. The role of the mullite phase in the increase of strength and resistance to aging processes of electrical porcelain of various types was described. Mullite hypothesis is valid in reference to siliceous (C 110), cristobalite (C 112) and aluminous C 120 type materials of a typical raw components content and phase composition. In the case of modern strengthened C 120 and C 130 type aluminous materials advantageous are only dispersed fine mullite needles. The precipitates of mullite phase, especially of bigger size, are undesirable.

【 授权许可】

Unknown