共查询到19条相似文献,搜索用时 150 毫秒
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氧化铈对改善ZTM陶瓷性能的作用 总被引:5,自引:0,他引:5
工业用电熔莫来石原料中含有钾、钠等杂质,而化学法制备的高纯莫来石中这些杂质含氏,因而以氧化锆增韧这两种莫来石制备陶瓷,发现其力学性能温度的变化趋势有较大差异。后者随温度升高力学性能反而有所增长。研究发现这一变化与原料中杂质含量有关。 相似文献
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指出了用国内原料可以制得符合世界领先公司堇青石组成所要求的各种堇青石配料复合物。当主要氧化物和杂质停含量相同时,观察至堇青石性能与配料组成的关系。研究了滑石预烧温度对一步烧结工艺制得堇青石试样性能的影响。 相似文献
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本文介绍了RBAO法的反应机理,根据典型的制备工艺,总结了该方法的影响因素,分析了制备近尺寸ZTM复相陶瓷的可能性,指出了仍需求探讨的一些问题。 相似文献
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本文介绍了电石生产原料中各种杂质的来源和含量,探讨了CO_2、SiO_2、Fe_2O_3、Al_2O_3、MgO、H_2O、S和P等杂质对电石生产消耗和操作的影响。杂质在炉内发生副反应所消耗的电约占电石生产总量的4~8%。 相似文献
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研究了在氧含量较低的条件下,热压ZTM/SiCp陶瓷复合材料活性氧化的问题,结果显示;在活性氧化的过程中,材料表面的形貌随氧化温度的升高而变化,最终形成非保护的氧化膜;活性氧化程度随氧化温度的升高而加剧,造成材料内部结构的损伤,使材料的力学性能大幅度下降。 相似文献
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本实验利用电子扫描电镜重点研究了以锆英石与氧化铝、A级铝矾土为原料反应烧结ZTM陶瓷的显策结构。分析表明:在不同的液相条件下,莫来石的晶粒发育产生了三种完全不同的晶形;液相量越高,莫来石的针状发育越好,过量氧化铝的存在严重阻碍了残余晶界玻璃相的析晶,金属铝粉的添加容易引入热处理难以消除的贯通笥气孔,这些气孔是影响反应烧结材料性能提高的重要因素。 相似文献
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本文采用常压烧结工艺制备ZrO2增韧莫来石陶瓷(ZTM).通过调整ZrO2、Y2O3含量制得不同组成的ZTM材料,其强度随ZrO2加入量的增加经历了先上升而后下降的过程.在不同组成下,材料的强韧化机理不同.当ZrO2≤30vol%时,ZTM材料是以应力诱导相变增韧为主;ZrO2>30vol%(如ZT M40(2Y)),材料则以微裂纹,裂纹偏转等强韧化机理为主;并且分散相ZrO2晶粒的大小及分布均匀性等对强韧化机理的发挥有很大影响. 相似文献
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《国际聚合物材料杂志》2012,61(6):407-423
Post-consumer cooking oil and soft drink PET bottles (PEToil and PETsoft drink) were ground and washed only with water (conventional washing). The polymer was then chemically washed (10 min in an aqueous solution of sodium hydroxide 5 mol·L?1 at 90°C) and rinsed. The materials before and after chemical washing were characterized by intrinsic viscosity, differential scanning calorimetry, thermogravimetry, elemental analysis, scanning electron microscopy with X-ray spectrum microanalysis, and gas chromatography coupled to mass spectrometry. The results indicated that conventionally washed PEToil is the material that most differs among the four tested ones, and that the other three are more similar to each other and to what is expected for pure PET. For example, the composition of PEToil washed only in water contained 30 volatile organic compounds, 5 nonvolatile compounds, and 7 metals, while PETsoft drink washed conventionally and chemically contained 5 volatile organic compounds and no metal or nonvolatile organic compounds. 相似文献
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J. Kiennemann C. Pagnoux T. Chartier J. F. Baumard J. M. Lamérant 《Journal of the American Ceramic Society》2004,87(12):2175-2182
Among the different impurities contained in Bayer alumina (Ca, Fe, Na, Si, Mg), calcium was found to greatly influence the dispersion of alumina particles in water. Up to 90% of calcium is dissolved at acidic pH, whereas calcium remains on the alumina surface in the basic pH range and screens the negative Al–O− charges. The presence of calcium, through reducing repulsive interactions between particles, has a negative effect on the dispersion of alumina. The adsorption of the Na+ salt of poly(acrylic acid) (PAA-Na) is strongly influenced by Ca2+ /PAA-Na interactions in suspension with an increase of the maximum adsorbed amount of PAA-Na in the presence of calcium. The amount of PAA-Na needed to reach a high electrostatic repulsion and a minimum of viscosity is 2 times higher in the presence of 400 pm calcium than for a low calcium content (∼80 ppm). Finally, with an appropriate amount of PAA-Na, a similar state of dispersion can be reached with or without the presence of calcium. 相似文献
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增加TiO2,Nb2O5晶核剂对烧结微晶玻璃结构与性能的影响 总被引:2,自引:0,他引:2
在Li2O-MgO-Al2O3-SiO2系玻璃中,加入不同含量的TiO2或Nb2O5为晶核剂,经过粉碎,混和,成型,烧结能制得致密的微晶玻璃,微晶玻璃的强度比示添加TiO2或Nb2O5的样品有所提高,当TiO2,Nb2O5含量增加,微晶玻璃强度也相应增加,加入TiO2或Nb2O5添加物对微晶玻璃的热膨胀系数影响较小,电子显微归咎表明,晶体颗粒随着添加物TiO2或Nb2O5的增加而减小,X光衍射结果 相似文献
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Wei Lian Zhenying Liu Rui Zhu Wenjie Wang Yan Liu Sheng Wang Yueqin Wang Yin Liu Lingbing Kong 《Ceramics International》2021,47(14):19914-19922
ZTM ceramics were successfully derived from coal gangue. The effect of zirconium source (ZrO2 and ZrOCl2?8H2O) and content on properties of the ZTM ceramics has been studied. The phase composition, density, and microscopic morphology were characterized with X-ray diffraction (XRD), Archimedes method and scanning electron microscopy (SEM). The influence of zirconium source, sintering temperature, zirconia content on flexural properties and fracture toughness was studied. The sample, with ZrOCl2?8H2O added 12% zirconia (Z2TM12) sintered at 1475 °C for 3 h has the highest density of 2.83 g/cm3. Partially stable t-ZrO2 was present in samples with zirconium oxychloride (ZrOCl2?8H2O) as the zirconium source, due to the constraints of mullite crystals. Therefore, Z2TM12 had both microcrack toughening and stress phase transformation toughening mechanisms. The flexural strength was increased from 162.40 MPa to 285.04 MPa, while the fracture toughness was improved to 3.55 MPa m1/2 from 2.38 MPa m1/2. Our achievement can be used as a reference to fabricate ZTM ceramics from coal gangue with high-value additions. 相似文献
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主要从我国日用陶瓷出口遭遇的技术性贸易壁垒的表现形式着手,分析国外技术性贸易壁垒对我国日用陶瓷出口的影响,并在此基础上提出了应对技术性贸易壁垒的对策。 相似文献
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