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  • 1975-1979  (6)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Sintering of chromic oxide (1975)
    Springer
    Refractories and industrial ceramics 16 (1975), S. 446-450 
    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 An investigation of the composition and crystallization of pigmental and metallurgical chromic oxide showed that the crystal size of the pigmental chromic oxide increases during roasting. In a study of the influence of the kiln atmosphere on the sintering process of chromic oxide it was established that the presence of an absorber of oxygen from the kiln atmosphere promotes sintering in open-flame and other industrial type kilns. An analysis was carried out of the grinding kinetics of chromic oxide as a factor in the sintering of specimens produced from the ground material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284714
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  • 2
    Electronic Resource
    Electronic Resource
    The reaction of kaolin clay with orthophosphoric acid (1977)
    Springer
    Refractories and industrial ceramics 18 (1977), S. 416-421 
    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 Orthophosphoric acid reacts with kaolinite clay already at room temperature. The reaction results in the dissociation of some kaolinite and the formation of acid aluminophosphates, its rate is at maximum during the first 4–10 days of the storage of the composition of clay with the acid, and it ceases when the composition is stored for longer periods. The triderivative of aluminophosphate begins to form only on heating above 100°C. At a temperature of 400°C and higher it forms more rapidly while the proportion of mono- and diderivatives of aluminophosphates diminishes. The fact that in compositions of kaolinite clay with orthophosphoric acid in storage only water-soluble acid aluminophosphates are formed and triderivative of aluminophosphate is absent makes it possible to produce clay-containing aluminosilicate compositions containing orthophosphoric acid at refractory plants in ready-for-use form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288243
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  • 3
    Electronic Resource
    Electronic Resource
    Sintering chromic oxide with an additive (1975)
    Springer
    Refractories and industrial ceramics 16 (1975), S. 696-701 
    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 An investigation was carried out of the influence of certain additives on the sintering of chromic oxide. In an air medium, chromic oxide does not sinter at all without an additive. It achieves slight sintering with added TiO2 and a higher degree of sintering when aluminosilicates are added. The effect of TiO2 on the sintering process is significantly more marked in a reducing medium. It was established that a relation exists between the degree of sintering and the change in the lattice parameters of the Cr2O3 caused by the addition of TiO2, and between the degree of sintering of aluminosillicate-containing chromic oxide and the percent glass-forming silica in the additive. Chromic oxide specimens were produced to a porosity of about 15%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280604
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  • 4
    Electronic Resource
    Electronic Resource
    Characteristics of solid-phase synthesis of mullite from oxides (1979)
    Springer
    Refractories and industrial ceramics 20 (1979), S. 485-490 
    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 The authors have investigated solid-phase synthesis of mullite and developed a procedure for quantitative x-ray analysis of mullite in two-phase mixtures of mullite and corundum. They have shown the advantage of joint vibrogrinding of the initial components as opposed to separate grinding during synthesis and sintering of mullite from quartz sand and commercial alumina. The onset of mullitization was noted at 1200°C, and complete mullitization at 1750°C (residence 16 h).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281097
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  • 5
    Electronic Resource
    Electronic Resource
    Activation and sintering of chromium oxide powders (1976)
    Springer
    Powder metallurgy and metal ceramics 15 (1976), S. 96-99 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Milling in a planetary mill raises the level of crystal lattice microdistortions in chromium oxide powder, reduces the particle size of the powder, and breaks up its mosaic blocks. The kinetics of the variation of the particle and block sizes is characterized by saturation. 2. Fine crystal structure defects are annealed out in the temperature range 900–1100°C. Marked densification of chromium oxide during calcining in a reducing atmosphere begins at 1300°C. 3. Milling as a means of activation substantially improves the sintering of Cr2O3 powders at temperatures of 1500–1600°C. For activated chromium oxide powders a correlation is found between the degree of sintering and the level of structural defectiveness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00793557
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of additions of some oxides on the sintering of cr2O3 in air and in a reducing atmosphere (1976)
    Springer
    Powder metallurgy and metal ceramics 15 (1976), S. 473-476 
    Details
    ISSN: 1573-9066
    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 sintering of chromic oxide with TiO2, Al2O3, MgO, and SiO2 additions in air and under reducing conditions at temperatures of 1300–1750°C. Alumina and magnesia do not intensify the densification of Cr2O3 during calcining in air. The most effective under these conditions is an addition consisting of 5 mole % TiO2 and 2–5 mole % of a 35 wt.% Al2O3 + 65 wt.% SiO2 mixture, which enables specimens to be obtained with an apparent porosity of less than 20% and a linear shrinkage of ∼ 12%. The solid-phase sintering of chromic oxide is improved by the addition of TiO2, which forms with Cr2O3 a limited solid solution. A composite addition apparently initiates sintering with the participation of a liquid phase at temperatures above 1500°C. Under reducing conditions, of all the additions investigated only titania has a beneficial effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117790
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