VOL 82, No. 8 (2009)

The main provisions of rheology are stated. The main rheological characteristics during flow and some structural features of silicate glass-forming melts are presented. The features of the change in the deformation characteristics of molten glass during the industrial molding of glass products, in particular glass containers, are reflected. Il. 4, bibliography: 8 titles.

It has been established by X-ray diffraction and electron microscopy that in glasses of the La ₂ O ₃ - B ₂ O ₃ - GeO ₂ a film texture of lanthanum germanate La ₂ Ge ₂ O < sub> 7 with a thickness of up to 5 ?m, under which a needle-shaped texture of the stillwellite-like LaBGeO ₅ with pyroelectric properties is formed. The temperature dependences of the dielectric and pyroelectric properties of samples with a sandwich structure La ₂ Ge ₂ O ₇ - LaBGeO ₅ - La ₂ Ge ₂ O ₇ and polished samples containing only the stillwellite-like phase. Il. 9, bibliography: 12 titles.

The influence of the intensity of air cooling on the heat transfer through the electrofused AZS-bar of the side wall of the cooking basin has been investigated. The expediency of using air cooling during the entire furnace campaign is shown. Tab. 1, ill. 2, bibliography: 10 titles.

The possibilities of evaluating the quality of the surface treatment of optical glass during grinding and polishing have been investigated. Tab. 1, ill. 3, bibliography: 4 titles.

The results of the synthesis of composite materials based on silicon nitride, which were discussed from the standpoint of chemical and (or) thermal conjugation, are presented. The synthesis of silicon nitride during the interaction of ferrosilicon in nitrogen in the combustion mode is considered as an inducing process. It is shown that due to the energy of self-propagating high-temperature synthesis in the process of nitriding ferrosilicon, it is possible to obtain composite ceramic materials based on silicon nitride: Si ₃ N ₄ - ZrO _{2 - Si 2 N 2 O, Si 3 N 4 - TiN - Si 2 N 2 O, Si 3 N 4 - BN, Si 3 Al 3 O 3 N 5 and Si 3 N 4 - SiC. Il. 6, bibliography: 18 titles.}

Powder mixtures based on calcium hydroxyapatite (HAP) and sodium dihydrogen phosphate have been investigated. It was found that due to mechanochemical activation in these mixtures, calcium phosphates are formed with the ratio Ca: P = 1. When heated, each of the components of the mixture undergoes changes: HAP (Ca: P = 1.67) partially transforms into tricalcium phosphate (Ca: P = 1.5), low-temperature calcium phosphates brushite and monetite (Ca: P = 1) transform into calcium pyrophosphate , NaH ₂ PO ₄ becomes NaPO ₃, and Na ₂ HPO ₄ - in Na ₄ P ₂ O ₇. In this case, the components interact with each other to form double ortho- and metaphosphates of sodium calcium. Tab. 1, ill. 3, bibliography: 9 titles.

The effect of complex additives SB-FF + TPFN, S-3 + TPFN, rheotan + TPFN on the mobility of ceramic slip is considered. The effect of these complexes on the physical and mechanical properties of ceramic specimens after firing has been studied. It was revealed that the complex additive SB-FF + TPFN allows to increase the mobility of the ceramic slip and the rate of mass gain in comparison with additives based on C-3 and rheotane, as well as to improve the operational properties of finished products. Tab. 2, bibliography: 2 titles.

The technological features of the manufacture of products of complex configuration from petrositall, obtained by thermoplastic pressing from two types of molding masses: fused basalt (glass) - plasticizer and natural basalt - basalt glass - plasticizer are investigated. The possibility of reducing the energy intensity of the technological process by minimizing the content of the glass component of the composition without compromising the technological characteristics of the casting mass and the physicochemical properties of petrositall is shown. Tab. 3, ill. 3, bibliography: 6 titles.