ISSN:
1573-9139
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions A study was made of the change in the porous structure of blanks containing powdered silicon, with subsequently increasing reaction-sintering time in a nitrogen atmosphere. It is shown that in the initial stages of reaction-sintering, the reduction in the porosity occurs on account of the reduction in the sizes of the large pores and the growth of the fine ones. In the following stages the porosity of the ceramic is reduced on account of the growth of the pores of predominant size. On the specimens containing the coarse-grained filler and finely dispersed silicon we noted the formation, during reaction sintering, of two types of pore, one of which is determined by the silicon nitride matrix, and the other by the development of microgaps between the matrix and the grains of filler as a result of marked differences in the coefficients of thermal compression of the grains of corundum and the silicon nitride matrix forming during the reaction sintering. It is shown that the ÉKP method can be used to evaluate the porous structure of ceramics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01398286
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