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亚微米级sic粉体
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  “亚微米级sic粉体”译为未确定词的双语例句
     But no work has been reported on the oxidation of sub-micrometer sized silicon carbide powder in the literature.
     本文首次对亚微米级SiC粉体在自然流动的空气和氧气中的氧化行为规律进行了系统研究。
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  相似匹配句对
     Oxidation behavior of sub-micrometer silicon carbide powder
     亚微米SiC的氧化过程
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The oxidation of silicon carbide was investigated from both thermodynamic and kinetics aspects. The results indicated that the oxidation of silicon carbide is very easy to take place in the oxygen atmosphere at high temperature. It was postulated that the inward diffusion of oxygen through the growing silicon dioxide layer formed on the surface of silicon carbide particles during oxidation period, is the rate determining step. The apparent activation energy in this process was also obtained as 143.4 kJ/mol...

The oxidation of silicon carbide was investigated from both thermodynamic and kinetics aspects. The results indicated that the oxidation of silicon carbide is very easy to take place in the oxygen atmosphere at high temperature. It was postulated that the inward diffusion of oxygen through the growing silicon dioxide layer formed on the surface of silicon carbide particles during oxidation period, is the rate determining step. The apparent activation energy in this process was also obtained as 143.4 kJ/mol over the temperature range from 1 173.15 K to 1 473.15 K.

从热力学和动力学角度研究了亚微米级SiC粉体的氧化过程 ,结果表明 :当温度低于 80 0℃ ,亚微米级的SiC粉体很难在空气中氧化 ;但在较高温度下 (90 0~ 12 0 0℃ )极易氧化 ,且服从抛物线速度方程 ,受氧气通过SiO2 氧化膜的内扩散控制 ,反应的平均表观活化能为 143.4kJ/mol。

Concentrated SiC slurry with Y2O3 and Al2O3 as sintering assistants was prepared, by using the medium of gelcasting premix solution and pH adjusting reagent of TMAH (tetramethylammonium hydroxide). The measurements of Zeta potential, sedimentation and viscosity show that SiC, Y2O3 and Al2O3 can disperse well in premix solution at basic region. Rheological study clarifies that concentrated SiC gelcasting slurry has low viscosity and shear stress after adding 0.5wt% TMAH, which is suitable to cast into the mold....

Concentrated SiC slurry with Y2O3 and Al2O3 as sintering assistants was prepared, by using the medium of gelcasting premix solution and pH adjusting reagent of TMAH (tetramethylammonium hydroxide). The measurements of Zeta potential, sedimentation and viscosity show that SiC, Y2O3 and Al2O3 can disperse well in premix solution at basic region. Rheological study clarifies that concentrated SiC gelcasting slurry has low viscosity and shear stress after adding 0.5wt% TMAH, which is suitable to cast into the mold. The green body formed by gelcasting was pressureless sintered at 2000℃for 1h. SEM image of SiC ceramic indicates that the structure of SiC sintered body is homogeneous and no obvious defects existing. The relative density, flexural strength, hardness and toughness of SiC sintered body are (98.1±0.2)%, (722±70)MPa, (20.18±0.75)GPa and (4.00±0.20)MPa·m1/2, respectively.

采用一种凝胶浇注成型预配液作为陶瓷粉体的分散介质,将亚微米级SiC粉体和烧结助剂Y2O3、Al2O3直接混合,制得了固含量>50vol%的凝胶浇注浆料,在100s-1的剪切速率下,浆料粘度<1Pa·s,可以顺利实现凝胶浇注成型;对得到的SiC素坯进行了无压烧结.在2000℃保温1h(氩气氛)的烧结条件下,烧结体相对密度为(98.1±0.2)%,抗折强度、硬度和韧性分别为(722±70)MPa、(20.18±0.75)GPa、(4.00±0.20)MPa·m1/2.

 
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