The paper also briefs the nozzle or moving blade surface hardening treatment technology, including plasma spraying and diffusion layer for preventing the nozzle and moving blade from SPE.

文章还介绍了为预防汽轮机喷嘴和动叶片免受固体颗粒侵蚀所采用的表面硬化处理技术，包括等离子喷涂层和扩散渗层在内；

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This paper is based on the theory of gas dynamics, by means of improving the first nozzle of diffusion pump in order to increase the pumping speed of diffusion pump are reported in the paper.

本文以气体动力学理论为基础，论述了如何通过改进扩散泵的第一级喷咀来提高扩散泵的抽气速率。

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