Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering

Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering
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固相反应常压烧结致密堇青石陶瓷的制备及性能

DOI:
10.1080/17436753.2018.1548150
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发表时间:
2019
影响因子:
2.2
通讯作者:
Pavlović, Vladimir
Pavlović, Vladimir
中科院分区:
材料科学4区
文献类型:
--
作者:
Obradović, Nina;Pavlović, Vera;Kachlik, Martin;Maca, Karel;Olćan, Dragan;Đorđević, Antonije;Tshantshapanyan, Ani;Vlahović, Branislav;Pavlović, Vladimir

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研究了纯堇青石2MgO:2Al_2O_3:5SiO_2和添加质量分数为5%TeO_2的堇青石的烧结。在高能行星磨机中机械活化的粉末混合物经单轴(20 Mpa)和冷等静压(1000 Mpa)成型后制成生坯。这些样品的无压烧结在1350℃下进行1h,通过固相反应和活化40min的粉末无压烧结获得了高于理论值95%的高相对密度,这在文献中是首次报道。采用X射线衍射仪、扫描电子显微镜和能谱分析等手段对烧结样品的相组成和显微结构进行了分析。在200 MHz频率下测量了样品的复介电常数实部。所有样品的损耗角正切均低于测量装置的分辨率。相对介电常数和密度之间的强相关性与以前发表的数据一致。
Sintering of pure cordierite 2MgO:2Al2O3:5SiO2, and cordierite with the addition of 5 mass % TeO2was studied. Green bodies were prepared from powder mixtures mechanically activated in a high-energy planetary mill, shaped by uniaxial (20 MPa) and cold isostatic pressing (1000 MPa). The pressure-less sintering of these specimens was performed at 1350°C for 1 h. High relative density over 95% of the theoretical value was obtained through solid-state reaction and pressure-less sintering of powder activated for 40 min, and for the first time reported in the literature. Phase composition and microstructures of sintered samples were determined by XRD and SEM, coupled with EDS mapping. The real part of the complex relative permittivity of the samples was measured at 200 MHz. The loss tangent of all samples was below the resolution of the measurement setup. A strong correlation between the relative permittivity and the density agrees with previously published data.
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