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分子生长模式
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  molecule growth model
     The results show that the oxidation resistance of the dipped sample is improved 300℃ comparing with the raw braids, when the braids are treated by nitric acid. Then it is dipped with the sol, of which the viscosity is between 0.01-0.012(Pa·s)and the molecule growth model is linear. The thickness of coating is about 0.5μm.
     结果表明,纤维经丙酮、硝酸处理后,再采用粘度为0.01~0.012(Pa·s)、分子生长模式为线性的溶胶浸渍,当涂层厚度为0.5μm左右时,浸渍试样抗氧化性能好,完全氧化失重温度为900℃,较之原始编织体提高300℃。
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     10 ?
     分子
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     The Moleculer Mechanism of Copper-stimulated Growth
     铜促生长作用的分子机理
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     Molecular Scale Computer Simulation on Procedure of Thin Film Growth
     薄膜生长过程的分子尺度模拟
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     MOLECULAR MATERIALS
     分子材料
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     growth of diameter ,height and volume;
     材积生长
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Kinetics and influencing factors (such as pH value, TEOS concentration and tempe rature) of sol-gel transition of SiO 2 sol prepared through the hydrolytic met hod were studied. The activated energy of the transition was calculated also. Th e results showed that the molecule growth mode of sol is linear in acid conditio ns. A gradual increase in coagulation time of sol is observed for pH value lower than 2. Further increase of PH value slightly decreases the coagulation time. R eaction activated energy is...

Kinetics and influencing factors (such as pH value, TEOS concentration and tempe rature) of sol-gel transition of SiO 2 sol prepared through the hydrolytic met hod were studied. The activated energy of the transition was calculated also. Th e results showed that the molecule growth mode of sol is linear in acid conditio ns. A gradual increase in coagulation time of sol is observed for pH value lower than 2. Further increase of PH value slightly decreases the coagulation time. R eaction activated energy is related to pH value of systems also. The results wer e explained by chemical bond, charge density and reaction mechanism.

 以硅酸乙酯为前驱体,通过水解法制备SiO2溶胶,系统研究了SiO2胶体的溶胶-凝胶转变过程。讨论了不同参数(如pH值、温度、硅酸乙酯的浓度等)对溶胶体系胶凝时间的影响,并对该过程的活化能进行了计算。结果表明:在酸性条件下,溶胶分子的生长模式为线性;随pH值增加,体系胶凝时间先增加后减少,拐点在pH等于2处;活化能与体系的pH有关。同时对上述结果从化学键、电荷密度、反应机理等方面进行了合理的解释。

The SiO2 coating on 3-D carbon fiber braids was prepared by the sol-dipping method. And the influence of coating preparation process on the oxidation resistance of the braids was also studied. The results show that the oxidation resistance of the dipped sample is improved 300℃ comparing with the raw braids, when the braids are treated by nitric acid. Then it is dipped with the sol, of which the viscosity is between 0.01-0.012(Pa·s)and the molecule growth model is linear. The thickness of coating is about 0.5μm....

The SiO2 coating on 3-D carbon fiber braids was prepared by the sol-dipping method. And the influence of coating preparation process on the oxidation resistance of the braids was also studied. The results show that the oxidation resistance of the dipped sample is improved 300℃ comparing with the raw braids, when the braids are treated by nitric acid. Then it is dipped with the sol, of which the viscosity is between 0.01-0.012(Pa·s)and the molecule growth model is linear. The thickness of coating is about 0.5μm. The oxidation resistance of dipped samples decreases when the thickness of coating is either thicker or thinner, because the coating is coated asymmetrically or combined badly with fiber surface.

采用溶胶-浸渍法,在三维碳纤维编织体的纤维表面涂覆SiO_2涂层。实验研究了涂层制备工艺对编织体抗氧化性能的影响。结果表明,纤维经丙酮、硝酸处理后,再采用粘度为0.01~0.012(Pa·s)、分子生长模式为线性的溶胶浸渍,当涂层厚度为0.5μm左右时,浸渍试样抗氧化性能好,完全氧化失重温度为900℃,较之原始编织体提高300℃。涂层过厚或过薄,编织体抗氧化性能下降,这是由于涂层在纤维表面分布不均匀或与纤维表面结合性较差引起的。

 
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