SIMPLE ESTIMATION OF THE TEMPERATURE ERROR IN THERMOGRAVIMETRIC EXPERIMENTS

被引：8
作者：
ALVES, SS [1 ]
机构：
[1] FAC ENGN PORTO,INST NACL INVEST CIENT,CTR ENGN QUIM,P-4099 OPORTO,PORTUGAL
来源：
THERMOCHIMICA ACTA | 1990年 / 157卷 / 02期
基金：
加拿大健康研究院; 美国国家卫生研究院;
关键词：
D O I：
10.1016/0040-6031(90)80026-U
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Two simple expressions are presented for the calculation of the maximum temperature difference between the centre and the outer boundary of a sample during a temperature-programmed TG experiment. The results obtained using these formulae are compared with those obtained with a classical heat transfer/chemical reaction model of a devolatilization reaction. The formulae give an excellent estimate of the maximum temperature difference for endothermic and athermic reactions (if this difference does not exceed ~ 30 ° C) and for exothermic reactions (if it does not exceed ~ 8 ° C). Above these values, although inaccurate, the approximate formulae may still be useful in warning of large temperature errors in a TG experiment. © 1990.
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页码：249 / 257
页数：9
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