TAILIEUCHUNG - Introdution to Thermal Analysis Techniques and Applications Part 7

Tham khảo tài liệu 'introdution to thermal analysis techniques and applications part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 112 TD has also been used X to study the sintering behaviour of kaolins and kaolmitic clays. On healing kaolin loses structural water al about 550 c and forms the mclakaolin structure. Above 96ÍTC this converts to a spinel structure and then above I lux to mullite. The mullite formed sinters at higher temperatures. These reactions arc accompanied by the shrinkages shown in Figure . The TD curves of kaolins and kaolinilic clays may be used for lheir classification x Figure Thcrmodilatomctry curve of kaolin based on Fisher Scientific Co. Bull. 156 p 4. with permission . Ollier applications of TO include studies of the effects of additives on the shrinkage of cellular concretes 9 the defects in non-stoichiomeiric oxides 10 the firing of ceramic s and the properties ofalloys III Thcrinomechiinical njilysis TMAl Static Force Thermomcchanometry sf TNI 63. J Principle Í 2 Static Force Thermomechanometry tor Static Force Thermomechamcal Analysis. sf-TM A will be more easily recognised by Its less systematic but well-established name Analysis TMA Thermodilatometry is carried out by measuring expansion and contraction under negligible loads. Further information of interest may be obtained by measuring the penetration . the expansion or contraction of a sample w hile under compression as a function of temperature. Alternatively the extension . the expansion or contraction of a sample under tension may be measured as a function of temperature. These techniques plus flexure and torsional measurements arc classified as thermomcchantcal analysis TMA and are obviously of great practical importance in materials testing sec applications . 113 Practical dr tails The apparatus used is based on that or thcnnodilatomctry Section . The principles of penetration extension flexure and torsional measurements are illustrated in Hgure . Figure Thcrmomcchanical analysts TMA a penetration b extension c flexure and d torsional measurements 114

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