玻璃纤维增强酚醛基复合材料平均线胀系数测试影响因素

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玻璃纤维增强酚醛基复合材料平均线胀系数测试影响因素
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作者单位:航天材料及工艺研究所
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中图分类号::TB302. 1
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Factors on Measurement of Thermal Expansionfor Glass Fiber/ Phenolic Resin Composites

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摘要:

研究了保温时间、升温速率、预处理温度等对玻璃纤维增强酚醛基复合材料线胀系数测试的影

响。结果表明,玻璃纤维增强酚醛基复合材料在加热条件下进一步固化,造成样品收缩与样品受热膨胀相抵

消,升温曲线出现平台。因此,测试前应对样品进行预处理,处理温度高于试样最终的测试温度,低于样品固化

温度,以免材料内部结构发生变化;设置合适的升温速率,升温速率低,增加了时间成本,升温速率太高,测温热

电偶引入的误差增加,且不均匀的加热使试样产生热应力,影响试验结果。

Abstract:

Several runs of thermal expansion measurements was presented for Pyros specimen, the precision and

bias of the result show that the instrument is in a good condition. A large number of thermal expansion measurements

was presented for the glass fiber/ phenolic resin composites as a function of holding time, heating rate and curing treat鄄

ment. The specimen was further cured by the increase of temperature, and the shrinkage of the specimen by the loss

of volatiles and the thermal deformation of curing reaction can counteract the expansion by the heating, which caused

plateau on the heating curves. Repeated expansion measurements for the specimen shows that the curves of heating

and cooling progress were almost identical. Heating treatment is necessary before thermal expansion measurements,

and the heating temperature should be higher than the measurement temperature, but lower than curing temperature

which keeps the microstructure of composites unchanged. The appropriate heating rate should be applied, for higher

heating rate will infect precision of the measured result, while lower heating rate will increase time cost

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杨阳高杉徐辉.玻璃纤维增强酚醛基复合材料平均线胀系数测试影响因素[J].宇航材料工艺,2016,46(2).

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在线发布日期: 2016-11-28
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