During the study we tried to lower the thermalexpansioncoefficient of cordierite by adding additives.
在本研究中,还试图通过添加外加剂来降低堇青石的热膨胀系数。
2
If the valve body material can be welded, but very different thermalexpansioncoefficient, or changes in operating temperature range of a larger thread junction closure weld must be honey.