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本方法为解决几何尺寸甚小,而透气系数又较低的多孔材料的透气系数测定问题。在本文所提出的测试原理和公式推导中考虑到了气体可压缩性对精确测定的影响;在仪器参数选取时注意到了最佳测定条件问题,因此它较类似的Blaine法有所改进;另外,在解决微小试样的正确夹样方法上设计出了新颖的夹具——拉膜夹具,它有效地保证了测试数据的良好重复性。本仪器结构简单,易于制作,工作可靠,操作与计算都很方便。经使用证明,它能完成直径仅为几毫米、透气系数在10~(-10)～10~(-12)厘米~2的微小多孔试样透气系数的高精度测定。
The method solves the problem of determining the gas permeability coefficient of a porous material with a very small geometric dimension and a low gas permeability coefficient. The influence of gas compressibility on accurate determination is taken into account in the test principle and formula derivation proposed in this paper. The problem of the best determination conditions is noticed when the instrument parameters are selected, so it is better than the similar Blaine method. In addition, Solve the problem of the correct sample clip sample designed a new fixture - pull the film fixture, which effectively ensure the good reproducibility of the test data. The instrument structure is simple, easy to make, reliable, easy to operate and calculate. It has been proved to be able to perform the high-precision determination of the gas permeability coefficient of a small porous sample with a diameter of only a few millimeters and a permeability of 10 ~ (-10) ~ 10 ~ (-12) cm ~ 2.