ON THE THERMAL SPALLING OF MAGNESITE REFRACTIORIES
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Small test-pieces were cut from 5 brands of magnesite bricks which had previously been examined for the modulus of elasticity at low to high temperatures (this Journal, 44, 789-796, 866-871, 1396). Several tests have been made with them for spalling tendency and associated properties. Some of the important results of the tests are abridged in the Table 1.Table 1. Some of the important results of the tests.The results seem to justify the following conclusions:(1) The spalling tendency of magnesite refractories cannot be correctly determined by water-quenching test because they are slaked by steam generated vigorously in the quenching.(2) The results of the water-quenching test agree fairly well with those of the slaking test. In other words, the effect of the steam seems to be greater than that of the quenching.(3) Most of the loss in tensile strength on water-quenching takes place at 1 or 2 cycles and that occurring at later cycles is not marked. Usual methods of comparing the tendency by the number of cycles are not right.(4) Among air-quenching tests, the method of comparing the resistance to spalling by the loss in tensile strength is rational. However it is not suitable since the probable errors in the measurement are great.(5) The compressive strength of magnesite refractories is often increased by the air-quenching.(6) The probable errors of the modulus of rupture of magnesite refractories are small. The losses in the modulus on the air-quenching agree fairly well with the modulus of elasticity at high temperatures.
- 公益社団法人 日本セラミックス協会の論文
公益社団法人 日本セラミックス協会 | 論文
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