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Some results of microscopic and X‐ray investigations of calcium carbide
Author(s) -
Hahne B.,
Gordziel W.,
Meerbote E.
Publication year - 1990
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170250315
Subject(s) - calcium carbide , carbide , lamellar structure , materials science , microstructure , metallurgy , crystal structure , mineralogy , chemical engineering , crystallography , chemistry , engineering
The structure of calcium carbide is investigated using thin sections and ground sections. Depending on chemical and other factors, calcium carbide occurs in three types of structure, which are interpreted as conversion products resulting from a high‐temperature structure. The pavement‐like structure containing CaC 2 ‐I is present in industrial carbide with a low content of nitrogen. With increasing fraction of lignite high‐temperature coke used for carbon supply as a substitute for coal coke in the production of carbide, the particle size decreases, and the micro hardness increases. The interlocked structure with CaC 2 ‐II and higher contents of nitrogen, which has been detected in carbide produced in the laboratory, is extremely dense. No grain sizes can be given. This kind of carbide produced in the laboratory has a lower micro hardness than industrial carbide. The mixed crystal structure is typical of carbide with a high content of sulphur. CaC 2 —CaS‐I is present as a phase. In all three types, the respective carbide phases have a marked lamellar structure. No typical shapes of crystals can be detected. In consequence of poor crystal formation, the information obtained with a microscope about the phases contained in the material investigated is complemented by X‐ray diffraction methods.