共查询到20条相似文献,搜索用时 15 毫秒
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A. M. Tsyv'yan 《Glass and Ceramics》2003,60(7-8):219-221
The effect of the chemical composition of the binder on the properties of electrocorundum abrasive tools is studied. Compositions of ceramic binders before and after firing of tools are analyzed. 相似文献
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A model for the calculation of the volume fraction of glass binder in abrasive ceramic tools is proposed, assuming the glass interlayers between abrasive grains to be spherical particles and the grain shape is approximated by various bodies of revolution: spheres, cylinders, and two paraboloids joined along a circumference The use of the model makes it possible to estimate the minimum content of glass binder, with which no contact bridges are formed between the grains, and also the thickness of the glass interlayers between the grains. 相似文献
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作者采用回归设计方法,试验研究了研磨片生产用胶粘剂配方的数学模型,由此计算出较优化的配方组成。首先根据以往的胶结与磨削试验经验,确认研磨片底胶的粘结强度与配方中主粘结剂、填料、触变剂的用量密切相关,确立本次回归设计研究中上述三组份的用量范围,然后基于这个用量范围采用对称单纯形回归设计方法,试验研究配方数学模型,取极大值粘结强度的配方为配方组成。其结果:主粘结剂(DZ-3水溶性酚醒树脂)用量0.448,触变剂(膨润土)用量0.182,填料(轻质碳酸钙)用量0.188,水(稀释、调和剂)用量0.182,计算的底胶的粘… 相似文献
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本文采用单纯形回归设计的方法,试验研究了研磨片用胶(底胶)的配方模型。经重复试验证明,该模型基本符合所讨论的研磨片用胶粘剂的粘结强度与配方组成的关系。作者认为,该方法可以推厂应用于其它多因素纯配方性试验的数据处理与优化设计。 相似文献
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Pruttskov D. V. Troyan V. D. Malyshev I. P. Shapovalova T. F. Sharapova V. V. 《Refractories and Industrial Ceramics》2000,41(9-10):345-348
Phase transformations in slime of normal electrocorundum upon heating in air and its high-temperature interaction with kaolin in steady and interspersing layers are studied. Preliminary oxidation of lower titanium oxides contained in slime is a necessary condition for obtaining mullite. The properties of mullite and retained glass are studied in detail. Mullite has a nonstoichiometric composition and forms solid solutions with titanium and iron oxides. It is assumed that their intensifying action in synthesis is a result of the lower viscosity of the alumosilicate melt. 相似文献
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The experimental temperature dependence of the electrical resistivity of a model composition based on natural flake graphite was compared with the results of a mathematical simulation performed with the use of a flake graphite polycrystal model. For increasing the section of contacts between flakes, the density of the material was increased as a result of impregnation with pitch and the subsequent calcination. The average values of the sizes of flakes in the composition and the tabular values of the conductivity tensor of a graphite quasi-single crystal served as the parameters of calculations. Based on the results of the mathematical simulation, it was found that temperature cracking due to the shrinkage of flakes on cooling should be taken into account for the correspondence of computed values to the experimental results. This cracking almost ceased at temperatures lower than 200°C regardless of the compaction of the material. 相似文献
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Kozaev A. A. Khabibulin E. E. Khaidarov B. B. Suvorov D. S. Khaidarov T. B. Lysov D. V. Kuznetsov D. V. 《Refractories and Industrial Ceramics》2022,62(5):587-592
Refractories and Industrial Ceramics - Samples of briquettes based on dust from electric arc furnace production with various organic and mineral binders have been obtained. The study of the... 相似文献
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Determination of Binder Decomposition Kinetics for Specifying Heating Parameters in Binder Burnout Cycles 总被引:2,自引:0,他引:2
The decomposition kinetics of poly(vinyl butyral) binder from barium titanate multilayer ceramic capacitors with platinum metal electrodes were analyzed by thermogravimetric analysis as a function of the heating rate. The activation energy and pre-exponential factor for the decomposition kinetics were determined from two types of integral equations, from the Redhead method, and from the variation in heating rate method. The accuracy of the kinetic parameters determined from these methods was then evaluated for describing the observed rate of binder decomposition. Although the individual models yielded very different kinetic parameters, all were capable of describing the experimental data within ±15% accuracy. The kinetic parameters were then used in a coupled transport and kinetic model for describing the buildup of pressure within the ceramic green body as a function of the heating cycle. A methodology based on calculus of variations was also developed to predict the minimum duration for the binder burnout cycle. 相似文献