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Mechanism and Preparation of Cordierite Powder Synthesized by Microemulsion-Sol Gel Technique

Author: LuHaoRan
Tutor: WangShaoHong;HouChaoXia
School: Shenyang University
Course: Materials Science
Keywords: Cordierite Microemulsion - sol - gel method. High-frequency multilayer chip inductors Dielectric properties Low-temperature sintering
CLC: TB383.3
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


In this study, using a microemulsion - a sol-gel process , nitrate, magnesium / aluminum nitrate / TEOS sol solubilized the Triton X.100 / n-hexanol / cyclohexane system , synthetic cordierite ceramic nanopowder . Form a broadly stable W / O type pseudoternary phase diagram were measured and plotted ; ; study by the micro- emulsion W / O type microemulsion phase behavior and determine the optimum parameters of the gelation quality time - the particle size distribution of the sol-gel prepared cordierite ceramic nanopowder sintering properties , crystallization properties , microstructure, dielectric properties ; of cordierite powder microemulsion - prepared by the sol-gel casting experiment . Elected with TritonX-100 as a surfactant , n-hexyl alcohol as a cosurfactant , cyclohexane as an oil phase , the synthesis temperature was 45 ℃ can be obtained when a broad, stable W / O type phase region ; this concentration of the precursor ( Mg2) pH values ??and [H2O ] / [ TEOS ] ratio was 1.5mol / L, 5 and 4.5 , gelation time most reasonable ( 0.5h) and the resulting gel component uniform ; microemulsion - sol-gel the prepared cordierite powder particle diameter of about 75nnm , and the distribution of concentration; cordierite materials at 900 ℃ under low temperature , has excellent dielectric properties (ε LT ; Tan.Delta @ LT ; 0.001; 1GHz) densification sintering ; blank tape can casting dried at 900 ° C for densification sintering , composed by a large number of a- cordierite phase microstructure gives the sintered body of high mechanical strength and excellent dielectric properties , to meet the high - frequency multilayer chip inductor with a dielectric material . requirements.

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