VOL 72, No. 8 (1999)

The sintering of X-ray amorphous and crystallized chemical mixtures by the method of continuous shrinkage, as well as by the standard method of powder sintering, has been investigated. Water absorption, open porosity and apparent density of the obtained samples were determined. Il. 6, bibliography: 4 titles.

The dependence of the depth of the median crack formed under the cutting roller during glass cutting and the work on its creation on the speed of drawing the cut line has been investigated. It was found that the maximum value of the work of creating a crack corresponds to the optimal cutting speed. Il. 4, bibliography: 6 titles.

A set of measures has been developed and implemented to improve the technical and economic performance of the glass-making furnace by means of a controlled change in the redox potential of the molten glass. Tab. 1, ill. 1, bibliography: 5 titles.

The results of the study of the composition, structure and properties of Kailin clay are presented. The possibility of obtaining ceramic materials with a light shard based on mineral raw materials of the Siberian region is shown. Tab. 6, ill. 3, bibliography: 5 titles.

A new modification of aluminum oxide g1-Al ₂ O ₃ with a spinel structure was synthesized under shock-wave action on gibbsite. The face-centered cubic lattice parameter is a = 7.935 (1) E. The X-ray diffraction pattern and the indexing results are presented. The synthesis procedure is described. Tab. 1, ill. 2, bibliography: 8 titles.

The processes of mullitization of high-temperature ceramic masses containing metadiabases have been studied. A quantitative relationship has been shown between mullite, quartz and plagioclase. It has been established that at firing temperatures of 1180 - 1200 ° C, the introduction of up to 30% by weight of metadiabases accelerates the process of mullitization, contributes to the formation of a more perfect structure of the emitted mullite. In ceramic masses, mullite crystallizes mainly from a kaolinite residue, as well as from plagioclase grains. Tab. 1, ill. 3, bibliography: 10 titles.

Ceramic pigments based on cobalt zirconate were obtained by deposition. IR absorption spectra confirm the possibility of the formation of cobalt zirconate at the stage of deposition. The color characteristics of the pigments recommended for staining glass and ceramics are given. Il. 3, bibliography: 3 titles.

In the compositions of hard porcelain masses, feldspar concentrates obtained by enrichment of rocks in Karelia have been investigated. The effect of feldspar concentrates, differing in the ratio of potassium and sodium oxides, mineralogical composition and structural features, on the structure and properties of porcelain masses has been studied. It was found that the structure of grains and the ratio of quartz and feldspar in the concentrate are of great importance for the formation of the glass phase during firing of samples. Tab. 3, ill. 2, bibliography: 3 titles.

The results of studies of the formation of a black core during high-speed firing of floor tiles and methods of its elimination are presented. Tab. 3, bibliography: 5 titles.

Using the method of mathematical planning of the experiment, the possibility of improving the drying properties of brick masses without the use of stony weakening was revealed. The proposed technique can be recommended for use in brick and tile factories in order to optimize the drying process. Il. 4.