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31.
32.
In the calcium aluminates cement - Portland cement - calcium sulfate based self leveling underlayments, the influence of raw materials on the properties such as rheology and hydration kinetics was considered. It was confirmed that calcium aluminates cement system formulation is suitable in cases where a short open time is required, and Portland cement system formulation is suitable in cases where a long open time is required with the result of flowability or rheology. And, in order to thin the viscosity of slurry, it turned out that the application of MF 2651F as a plasticizer and tartaric acid as a retarder were effective. Moreover, MF 2651F seldom delayed the hydration reaction compared with other plasticizers. The flow value and the yield stress showed correlation, without being dependent on the difference in formulation or a water powder ratio. This was considered to be because for the yield stress to relate to the fragility of the aggregation structure of slurry. 相似文献
33.
Al/AgO电池放电过程中产生铝酸盐,它对AgO正极和铝负极均有不利影响,但对铝负极影响更大。铝酸盐最大允许浓度约为2.8M。 相似文献
34.
35.
用实验室间歇式结晶器进行了高浓度铝酸钠溶液晶体长大过程研究,使用电敏粒度计数仪测试出单位重量的颗粒数,通过多次循环试验数据对比判断晶体的长大速度。试验溶液苛性碱浓度为155和175g/L,温度61~51℃,每次循环试验分解40h。循环试验的粒度变化发现:铝酸钠溶液分解过程中,晶体长大速率较慢;苛性碱浓度为175g/L的溶液,在分解长大过程中细颗粒(-20μm)晶体长大速度较苛性碱浓度为155g/L溶液的晶体长大速度慢;浓度对相对较粗颗粒(60μm以上)晶体长大趋势的影响不明显。 相似文献
36.
SrAl2O4: (Eu2+, Dy3+) phosphor was prepared by solid state reaction. B2O5 as a flux was added in SrAl2O4:(Eu
2+, Dy3+) in order to accelerate a solid state reaction. In this paper, the effects of B2O3 on the crystal structure and the phosphorescent properties of the material have been evaluated. The synthesized phosphor
exhibited a broad band emission spectrum peaking at 520 nm, and the spectrum peak showed little effect by the B2O3 contents. The maximum afterglow intensity of the SrAl2O4: (Eu2+, Dy3+) phosphor was obtained at the B2O3 content of 5%. Adding the B2O3 caused uniform distortion to the crystal structure of the phosphor and resulted in reducing the lengths of a and c axes and
Β angle of the SrAl2O4 crystal. The uniform distortion was accompanied with crystal defects which can trap the holes generated by the excitation
of Eu2+ ions. The afterglow characteristic of the SrAl2O4: (Eu2+, Dy3+) phosphor was thus enhanced. 相似文献
37.
To investigate the correlations between the structural transformations of calcium aluminates and luminescent properties, Eu doped Ca–Al–O system phosphors were synthesized by solid-state reaction process in H2 atmosphere with CaCO3, Al2O3, Eu2O3, and a flux, H3BO3 as starting materials. Various phases such as CaAl2O4, CaAl4O7, Ca3Al2O6, and Ca12Al14O33 were achieved depending on firing temperature, flux amounts, and the mixing ratio of CaO to Al2O3. Among various phases, only CaAl2O4 contributed to a strong blue emission at 440 nm with an excitation wavelength of 330 nm. 相似文献
38.
In this paper, methyl vinyl silicone rubber vulcanizates were filled with silver-zirconium phosphate treated with aluminate coupling agent. The effect of the surface modification was characterized by the Fourier transform infrared and viscosity methods. The dispersion of silver-zirconium phosphate in ethanol and methyl vinyl silicone rubber was examined by the scanning electron micrograph. The cross-link density, mechanical properties, and antibacterial performance of methyl vinyl silicone rubber were analyzed. The results showed that the aluminate coupling agent significantly suppressed the agglomeration of silver-zirconium phosphate particles. The modification of silver-zirconium phosphate mitigated the degeneration of mechanical properties resulted from the addition of antimicrobials and had no negative effect on the antibacterial property. 相似文献
39.
《Ceramics International》2019,45(16):19784-19792
40.
Etsuo Sakai Tomoaki Sugiyama Tuyoshi Saito Masaki Daimon 《Cement and Concrete Research》2010,40(6):966-970
This paper describes the mechanical properties and microstructure of calcium aluminate based ultra high strength cement at early age. By using silica fume, polycarboxylate based superplasticizers and a hybrid defoaming mixer, which is anon-contact mixer, cement paste with water to powder ratio of 0.1 can be cast in a mold. When the water to powder ratio is 0.1, the bending strength of hardened samples can be obtained over 30 MPa. Samples were cured at 40 or 60 °C for 7 days. At 60 °C, C3AH6 is mainly produced, whereas C3AH6 and C2AH8 are produced at 40 °C. The mechanical properties of hardened samples with low water to powder ratio are related to the pore volume and pore size distribution. 相似文献