抄録
The preparation of fine powders by grinding may be accomplished by either a dry or a wet process, and the differences between these have been discussed. In general, it is well known that there are many mechanical properties which have direct effects upon the grindabilities of solids. Breaking properties, in particular are related to the grindabilities.
In this paper, creep tests were carried out continuously for three hours on glass material under a bending condition in order to investigate the difference between dry and wet grinding. A crack was formed on the center of the tension side of the test piece by the Vickers diamond of the Micro Hardness Tester with an automatic loading system. The quantitative effects of water on the crack propagation on the glass surface and the creep property of glass were investigated.
The results are summarized as follows:
1) The crack length in water is larger than that in air.
2) The ratio of both varied with the hold time and the bending stress.
3) Based on the above, it could be presumed that there is a bending stress at which the specimen willl fracture in water but not in air.
