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precursor conversion
相关语句
  先驱体转化
     Microstructure of the C f/SiC composites by precursor conversion hot pressing sintering
     先驱体转化-热压烧结碳纤维增韧碳化硅复合材料的显微结构
短句来源
     The microstructure of the C f/SiC composites, prepared by precursor conversion hot pressing sintering with polycarbosilane (PCS) as precursor and binder and AlN Y 2O 3 as additives, was investigated using XRD, HRTEM and SEM.
     采用XRD,HRTEM 和SEM 等分析测试手段,研究了以聚碳硅烷(PCS)为先驱体和粘结剂,Y2O3 和AlN 为烧结助剂,采用先驱体转化-热压烧结法制备的Cf/SiC复合材料的显微结构。
短句来源
     The C f/SiC composites were prepared by precursor conversion hot pressing sintering with AlN and Y 2O 3 as additives.
     以AlN和Y2 O3为烧结助剂 ,采用先驱体转化 -热压烧结的方法制备了Cf/SiC复合材料 .
短句来源
     As a typical example of precursor conversion method,the effects of each factor on SiC ceramic fiber mechanical properties are summarized in four stages of whole preparation of the fibers.
     本文以先驱体转化法为例 ,针对SiC陶瓷纤维整个制备工艺过程中的四个阶段 ,综述了各个因素对SiC陶瓷纤维最终力学性能的影响
短句来源
     Tantalum carbide materials were prepared by liquid precursor conversion, and the phase compositions and the microscopic structures of samples were characterized by XRD and SEM, respectively.
     报道了一种通过液相先驱体转化制备碳化钽的方法.用XRD分析材料高温处理后的相组成及晶态结构;
短句来源
  相似匹配句对
     On Conversion
     论转化构词法
短句来源
     PRL could modulate the conversion of the precursor into testosterone in the presence of hCG.
     催乳素在hCG存在下可调节底物转化为睾酮。
短句来源
     conversion of flavanones.
     黄烷酮的转化.
短句来源
     Conversion of adult human myoblasts into neural precursor cells in vitro
     体外诱导成人成肌细胞转化为神经前体细胞
短句来源
     A Feminist Precursor
     一个女权主义先行者
短句来源
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  precursor conversion
Obviously, both the rate and extent of gI precursor conversion to mature gI were increased in the presence of gp63.
      


C f/SiC composites were prepared by precursor conversion/hot_pressing with AlN-Y 2O 3 as additives. The effect of additives (AlN and Y 2O 3) and sintering temperature on the mechanical properties of the composites were investigated. The results show that, owing to the formation of AlN-SiC solid solution and liquid phase sintering, the composites exhibit better mechanical properties. The mechanical properties will be improved with the content of sintering additives at lower temperature(1 800 ℃). At...

C f/SiC composites were prepared by precursor conversion/hot_pressing with AlN-Y 2O 3 as additives. The effect of additives (AlN and Y 2O 3) and sintering temperature on the mechanical properties of the composites were investigated. The results show that, owing to the formation of AlN-SiC solid solution and liquid phase sintering, the composites exhibit better mechanical properties. The mechanical properties will be improved with the content of sintering additives at lower temperature(1 800 ℃). At higher temperature (1 850 ℃), the composites with less additives show excellent fracture toughness. With the increase of the additives, the flexural strength will be improved, but fracture toughness will decrease as the result of the strengthening of the interface between carbon fiber and matrix due to increase of grain boundary phase, which causes the failure of the pullout of fibers. On the other hand, the composite displays better fracture toughness because of the debonding of fibers. Debonding and pullout of the fibers play an important role in the toughening of these composites.

以AlN- Y2O3 为烧结助剂体系,采用先驱体转化- 热压法制备出了Cf/SiC复合材料. 研究了烧结助剂及其用量和烧结温度对复合材料力学性能的影响. 结果表明,由于AlN- SiC的固溶和液相烧结的作用,复合材料具有较好的力学性能. 烧结温度为1 800 ℃时,复合材料的抗弯强度和断裂韧性随烧结助剂用量的增加而不断提高;烧结温度为1 850 ℃时,烧结助剂用量较少的复合材料具有很好的断裂韧性. 随着烧结助剂用量的增加,虽然复合材料的抗弯强度不断提高,但由于晶界相和AlN- SiC 固溶体量的增加,使纤维与基体的结合过强,从而导致纤维不能发挥拔出作用,复合材料的断裂韧性值降低. 不过,复合材料由于纤维的脱粘仍具有较好的断裂韧性. 碳纤维的脱粘和拔出对Cf/SiC 复合材料的增韧起到了重要的作用.

The microstructure of the C f/SiC composites, prepared by precursor conversion hot pressing sintering with polycarbosilane (PCS) as precursor and binder and AlN Y 2O 3 as additives, was investigated using XRD, HRTEM and SEM. The results showed that Y 2O 3 reacted with the pyrolytic products of the PCS and the oxides on the surface of the AlN and SiC grains, forming the liquid phase assisting in the densification of the composites, and the fine SiC AlN solid solution was formed between AlN...

The microstructure of the C f/SiC composites, prepared by precursor conversion hot pressing sintering with polycarbosilane (PCS) as precursor and binder and AlN Y 2O 3 as additives, was investigated using XRD, HRTEM and SEM. The results showed that Y 2O 3 reacted with the pyrolytic products of the PCS and the oxides on the surface of the AlN and SiC grains, forming the liquid phase assisting in the densification of the composites, and the fine SiC AlN solid solution was formed between AlN and the PCS through reaction dissolution precipitation at the grain boundaries and the fiber/matrix interface. Due to the presence of the carbon rich fiber/matrix interphase with a certain of SiC AlN solid solution, a desirable fiber/matrix interfacial bonding was obtained, which facilitated the debonding and pullout of the fibers. As a result, the composite exhibited excellent mechanical properties.

采用XRD,HRTEM 和SEM 等分析测试手段,研究了以聚碳硅烷(PCS)为先驱体和粘结剂,Y2O3 和AlN 为烧结助剂,采用先驱体转化-热压烧结法制备的Cf/SiC复合材料的显微结构。结果表明,Y2O3 主要与PCS的裂解产物以及AlN 和SiC表面的氧化物发生反应,形成有助于复合材料致密化的液相,而AlN 则与烧结液相和PCS之间通过反应- 溶解- 沉积过程,形成主要分布于界面相中的微小SiC-AlN 固溶体。正是由于含有一定量SiC-AlN 固溶体的富碳界面相使纤维与基体之间的结合适中,纤维易发挥脱粘和拔出作用,复合材料具有很好的力学性能

The C f/SiC composites were prepared by precursor conversion hot pressing sintering with AlN and Y 2O 3 as additives. The effects of sintering temperature and additives on the microstructures and properties of the composites were investigated. The composite sintered at as low as 1 750 ℃ already showed higher density and better mechanical properties, which was mainly attributed to the liquid phase sintering and the formation of the AlN SiC solid solution. On increasing sintering temperature to 1...

The C f/SiC composites were prepared by precursor conversion hot pressing sintering with AlN and Y 2O 3 as additives. The effects of sintering temperature and additives on the microstructures and properties of the composites were investigated. The composite sintered at as low as 1 750 ℃ already showed higher density and better mechanical properties, which was mainly attributed to the liquid phase sintering and the formation of the AlN SiC solid solution. On increasing sintering temperature to 1 800 ℃, the flexural strength and fracture toughness of the composite were substantially improved up to 691.6 MPa and 20.7 MPa·m 1/2 respectively in spite of the slightly elevated density, and the composite exhibited tough failure. Despite the improved density, the composite sintered at 1 850 ℃ displayed brittle failure, which mainly attributed to the strongly bonded fiber/matrix interface and the degradation of the fibers. All the results indicated that the fiber/matrix interface played a critical role in the properties determination, and the prevalent toughening mechanism operating in the composites is the debonding and pullout of the fibers. [

以AlN和Y2 O3为烧结助剂 ,采用先驱体转化 -热压烧结的方法制备了Cf/SiC复合材料 .研究了烧结温度对复合材料界面和力学性能的影响及烧结助剂对显微结构的影响 .结果表明 :由于烧结时晶界液相和SiC AlN固溶体的形成 ,当烧结温度为 1 750℃时 ,复合材料具有较高的致密度和较好的力学性能 ;当烧结温度升为 1 80 0℃时 ,在复合材料密度增大的同时 ,其力学性能也大幅度提高 ,此时复合材料抗弯强度与断裂韧性分别高达 691 .6MPa和2 0 .7MPa·m1 / 2 ,复合材料呈现韧性断裂 ;进一步提高烧结温度至 1 850℃时 ,虽然复合材料的密度有所增加 ,但由于纤维 /基体界面结合过强以及纤维本身性能退化加剧 ,复合材料呈现典型的脆性断裂 ,其力学性能急剧降低 ;纤维 /基体的界面是导致纤维增强陶瓷基复合材料性能的关键因素 ,其中 ,纤维的脱粘与拔出是主要的增韧因素 .

 
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