This paper reviews two dimensional electron gas formed on the liquid helium surface, the semiconductor surface space charge layer and the compound semiconductor heterojunction interface.
本文简要介绍了液氦表面、半导体表面空间电荷层和化合物半导体异质结界面的二维电子气。
The surface layer consists of oxide, sulphide and N, C compound.
表层由氧化物、硫化物和氮（碳）化合物组成；
The unsuitable carbonitriding process, internal oxidation, over deep depth of carbonitrided layer and crust like C N compound on the surface are the main reasons to cause fracture.
碳氮共渗工艺选择不当，共渗层过深，表面出现壳状碳氮化合物、内氧化等缺陷组织是造成其断裂的主要原因。
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