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  • 1985-1989  (6)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Influence of additives on the phase inversions in alumina fibers (1988)
    Springer
    Refractories and industrial ceramics 29 (1988), S. 603-611 
    Details
    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 phase formation in heat-treated alumina fibers without additives and with the addition of SiO2, MgO, and Cr2O3. It is established that the addition of these oxides and their combinations retards the conversion of the transition forms of Al2O3 which are unfavorable for the strength properties of alumina fibers, into the stable α-form. The causes of the phenomenon observed are connected with the change in the concentration of the point defects of the structure governing the stated inversions with the addition of impurity oxides to the fibers made of Al2O3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287796
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of the production methods and the properties of corundum suspensions (1985)
    Springer
    Refractories and industrial ceramics 26 (1985), S. 651-658 
    Details
    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 comparative evaluation of the methods of obtaining corundum suspensions with a glass phase was conducted. Three methods were studied: dry milling in a metallic vibrational mill followed by a HCl wash to remove the iron contaminant and subsequent suspension; suspension of a powder dry-milled in a vibrational mill having a corundum lining; and additional wet milling in an acidic medium using a corundum-lined ball mill. It was established that wet milling of alumina with a glass phase in an acidic medium permits one to obtain castings having a strength twice higher after removing from the mold and 25–30 times higher after drying. In this case, the duration of the slip preparation processes decreases considerably. The strength of the castings made from the wet-milled alumina increases rapidly with decreasing moisture content in them (hydraulic setting) in contrast to the strength of the castings obtained from the alumina powder that was dry milled in a metallic vibrational mill and acid-washed. This makes it possible to carry out machining of the dry unfinished product using diamonds and to decrease the number of rejections of intricate products by 30–35%. It was shown that the increased strength of the castings obtained according to the third method is due to the retention (realization) of the binding properties of aluminum chlorides formed during the process of milling in the acidic medium and due to the formation of calcium hydrosilicates in the system. The structure and the properties of the ceramics based on the castings obtained according to different methods are very close to each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389987
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  • 3
    Electronic Resource
    Electronic Resource
    Structure evolution of corundum concretes (1989)
    Springer
    Refractories and industrial ceramics 30 (1989), S. 203-211 
    Details
    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 Structure evolution of the corundum concretes based on the binders of different compositions was studied. We demonstrated the effect of Cr2O3, CCLS, and technological (technical-grade) lignosulfonate on the strength gain of the cement stone and the concrete based on it, the phase composition of the cement stone and the concrete, their variation during the process of heat treatment, and on the microstructure. The ability of these additives to increase the degree of hydration of the high-alumina cement was established. The formation of a large quantity of aluminum hydroxide and calcium hydromonocarboaluminate confirm this fact. The evolution of a dense and strong structure of the corundum concrete based on the high-alumina cement and the occurrence of additional growth during the high-temperature firing process due to the formation of CA6 and the solid solutions of corundum and CA6 with Cr2O3 were shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326668
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  • 4
    Electronic Resource
    Electronic Resource
    Properties of suspensions and the preparation of articles based on solid solutions of ZrO2-CaO (1986)
    Springer
    Refractories and industrial ceramics 27 (1986), S. 279-283 
    Details
    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 It has been established that the traditional parameters of the preparation of cast slips made from stabilized ZrO2 are unsuitable for the experimental composition ZrO2+25% CaO since the time required for washing of the hammered-on iron is sharply increased. The behavior of the hammered briquette of the experimental composition depends on the aggregation of fine particles having a well-developed surface and its dissolution in solutions of HCl, leading to the formation of a liquid solvated shell around a particle and thus preventing the deposition of the suspensions and the removal of iron chloride. Shortening the duration of the milling of the material from 21 to 4 h helps to speed up the deposition of the suspensions as a result of the coarser particle aggregates and the better removal of the iron chloride. In this case the working properties of the articles are not impaired.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386668
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of complex mineral additions on the hydration of alumina cement and on the strength of the concrete based on it (1985)
    Springer
    Refractories and industrial ceramics 26 (1985), S. 517-528 
    Details
    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 systematic study of the strength characteristics of an alumina cement with certain plasticizer and mineral additions was conducted. It was shown that sodium polyphosphate and calcium chromelignosulfonate act as intense plasticizers in the alumina cement facilitating reduction of mixed water up to 15–20%. It was established that the plasticizing additions help in increasing the strength of cement. Based on thermographic, x-ray, petrographic, and electron microscopic studies, the products (results) of hydration of the high-alumina cement and their relationship with the degree of strengthening were established. It was shown that the cement containing calcium chromelignosulfonate preserves the high strength of the aluminosilicate refractory concrete during heating up to 1000°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386460
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  • 6
    Electronic Resource
    Electronic Resource
    Refractories for lining blast furnaces (1985)
    Springer
    Refractories and industrial ceramics 26 (1985), S. 238-244 
    Details
    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 At the Chasov Yar refractories combine we developed and introduced a technology for the production of chamotte kaolin refractories with a porosity of not more than 12% and a mass proportion of not less than 42% Al2O3 on the basis of chamotte from high-grade Polozhe kaolin, and also additions to the batch of finely milled mullite-corundum chamotte. Using the new technology we produced a batch of goods designated ShPD-42 for lining the shafts, bosh, and upper parts of blast furnaces of large capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539585
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