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  • 1
    Electronic Resource
    Electronic Resource
    Study on the Synthetic Process of Calcium Borate (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 605-608 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Calcium borate used for non-pollution flux of ceramic decoration materials is synthesized by using boric acid and calcium carbonate as raw materials. The effects of reaction temperature, concentration, time, pH value and additive agent on synthesis of calcium borate are studied. The synthesized products are characterized by using DTA, XRD, TEM and SEM. The results show that the better conditions are: synthesis temperature is 80-100°C, the proportion of boric acid and water is0.26 ~ 0.42 to 1(mol), the proportion of calcium carbonate and boric acid is 0.09-0.15 to 1(mol), the pH value is 5 ~ 7, reaction time is 3hs. The synthetic calcium borate is non-crystalline with particle size of 0.1 ~ 0.2 µm, when being calcinated at 300°C, the main crystal phase isCaO·3B2O3·4H2O
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.605.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Study on Superplastic Grain Growth Model and Dynamic Simulation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 639-644 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The ability of metal plastic forming and the mechanism performance of the part arecorrelated with grain granularity of the metal. Grain growth is a prominent character of themicrostructure evolution. It is very helpful for the design of process and die structure to study themechanism of superpalstic deformation and microstructure evolution of superplastic forming. Themicrostructure evolution of material is impact directly the mechanic performance of the component insuperplastic forming. It is necessary to optimize the complex process and to predict the microstructureevolution. A new simulation method that integration the finite element simulation and themicrostructure simulation of superplastic forming is introduced in this paper. Monte Catlo method isan odds simulating technique and can simulate time course of microstructure evolution. Based on thestudies of superplastic grain growth mechanism, the superplastic grain growth rate equation arederived in this paper by coupling static state anneal grain growth mechanism and deformationstimulated grain growth mechanism. The grain growth drive force of superplastic deformationincludes mostly boundary energy and distortion energy. A new drive force model is derived based onenergy model. The microstructure evolution is correlated with the stress and strain of the part, and theintegration of superplastic forming FE simulation and microstructure evolution MC simulation isrealized. Using the integrating simulation technique can predict not only the forming process but alsopresenting grain growth image of the part. Experimental studies of the part in forming process andmicrostructure evolution were performed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.639.pdf
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    Paper (German National Licenses)
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