At the same time, double compound layer which was composed of metal transition layer with high hardness and ceramic layer improved the service life and safe stability of the composite pipes greatly.

同时，高硬度的金属过渡层与陶瓷层组成的双层复合结构使复合管的使用寿命和安全稳定性显著提高。

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At the same time, double compound layer which was composed of metal transition layer with high hardness and ceramic layer improved the service life and safe stability of the composite pipes greatly.

同时，高硬度的金属过渡层与陶瓷层组成的双层复合结构使复合管的使用寿命和安全稳定性显著提高。

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