首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 78 毫秒
1.
环氧树脂的增韧改性研究进展   总被引:1,自引:0,他引:1  
杨卫朋  艾静  王青松 《材料导报》2011,(Z2):394-397
综述了环氧树脂增韧的研究进展。主要介绍了环氧树脂的增韧方法(热塑性树脂增韧、热致性液晶聚合物增韧、核壳聚合物粒子增韧、原位聚合增韧等)及相关增韧机理,展望了今后环氧树脂增韧改性的发展趋势。  相似文献   

2.
综述了环氧树脂增韧的研究进展。主要介绍了环氧树脂的增韧方法(热塑性树脂增韧、热致性液晶聚合物增韧、核壳聚合物粒子增韧、原位聚合增韧等)及相关增韧机理,展望了今后环氧树脂增韧改性的发展趋势。  相似文献   

3.
双马来酰亚胺增韧改性研究进展   总被引:1,自引:0,他引:1  
综述了双马来酰亚胺(BMI)增韧改性的方法与原理,介绍了改性研究的最新进展,包括烯丙基化合物增韧,二元胺增韧,内扩链法增韧,热塑性树脂增韧,橡胶增韧,互穿网络法增韧,氰酸酯增韧与微胶囊增韧等方法的特点与改性效果.  相似文献   

4.
环氧树脂的增韧改性新方法   总被引:2,自引:0,他引:2  
介绍了环氧树脂增韧的一些方法,包括热塑性树脂增韧、液晶增韧、互穿聚合物网络增韧、纳米粒子增韧;并简要总结和分析了其增韧机理和实际应用中产生的问题.  相似文献   

5.
双马来酰亚胺树脂增韧改性研究新进展   总被引:2,自引:0,他引:2  
综述了双马增韧改性的最新研究进展,详细介绍了各种改性方法,并对其机理进行了简要阐述,内容包括Michael共聚增韧、Diels-Alder共聚增韧、内扩链法增韧、橡胶共混增韧、热塑性树脂共混增韧、互穿网络法增韧改性等几个方面,最后就双马增韧改性的发展趋势提出了几点建议.  相似文献   

6.
晶须和相变复合增韧陶瓷的复合增韧模型   总被引:8,自引:0,他引:8  
建立了晶须和相变复合增韧陶瓷的复合增韧模型,其中晶须增韧考虑了裂纹桥联和裂纹偏转两种机理;相变增韧在考虑体膨胀作用的基础上,用切应变影响因子来考虑切应变增韧效应.计算结果表明,相变增韧、桥联增韧和裂纹偏转增韧存在相干性,相变增韧降低晶须增韧效果,而晶须增韧促进相变增韧效果,SiCw/ZrO2(2mol%Y2O3)/Al2O3断裂韧性的计算结果与实验结果吻合.  相似文献   

7.
碳化硅陶瓷以其优异的性能被广泛利用于各种领域,但其脆性限制了其性能的发挥,因此其增韧技术得到广泛研究并取得良好效果。综合评述了碳化硅陶瓷增韧机理和增韧方法的研究进展,包括晶须或纤维增韧、颗粒弥散增韧、表面改性技术增韧、自增韧、层状结构复合增韧的增韧机理和方法进。  相似文献   

8.
热塑性高分子材料的增韧对拓宽脆性树脂的应用起着至关重要的作用。有关热塑性高分子材料增韧改性的研究已有大量报道,学者对增韧效果的影响因素进行了研究,并针对某一种增韧剂在特定树脂中的增韧机理进行探讨,但未见系统性阐述热塑性高分子材料增韧机理的相关报道。热塑性高分子材料增韧机理的研究对实际改性过程中增韧剂种类的选择、添加量的控制、增韧效果的提高等具有理论指导意义。介绍了受控液体银纹化、弹性体增韧、刚性粒子增韧和协同增韧等多种增韧机理,对比了各机理之间的异同,指明了增韧机理的研究方向。  相似文献   

9.
从陶瓷断裂的基本理论入手,对比了相变增韧、微裂纹增韧、纤维增韧和纳米颗粒增韧等技术应用到陶瓷领域的增韧机理及其实施方法,举例阐述了这些增韧方法的应用,并对其发展前景进行了展望。  相似文献   

10.
有机硅增韧环氧树脂的研究进展   总被引:1,自引:0,他引:1  
综述了有机硅改性环氧树脂增韧的主要方法及增韧机理;主要从硅橡胶改性环氧树脂增韧、聚硅氧烷改性环氧树脂增韧、共聚改性环氧树脂增韧3个方面介绍了有机硅改性环氧树脂增韧的研究现状,并介绍了近期进展,展望了有机硅改性环氧树脂的发展趋势.  相似文献   

11.
In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.  相似文献   

12.
13.
A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.  相似文献   

14.
On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……  相似文献   

15.
A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.  相似文献   

16.
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……  相似文献   

17.
In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M2(B,C), (W,Mo)2(B,C), M3(B,C), M23(B,C)6 type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm2. The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K1 mill housing of bar mill.  相似文献   

18.
We associate a variety of innovations with the term "Industry 4.0". The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...  相似文献   

19.
The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...  相似文献   

20.
Several researches have been reported about the characteristic of β-Ga2O3 nanowires which was synthesized on nickel oxide particle. But indeed, recent researches about synthesis of β-Ga2O3 nanowires on oxide-assisted transition metal are limited to nickel or cobalt oxide catalyst. In this work, Gallium oxide (β-Ga2O3 ) nanowires were synthesized by a simple thermal evaporation method from gallium powder in the range of 700 - 1000℃ using the iron, nickel, copper, cobalt and zinc oxide as a catalyst, respectively. The β-Ga2O3 nanowires with single crystalline without defects were successfully synthesized at the reaction temperature of 850, 900 and 950℃ in all the catalysts. But optimum experimental condition in synthesis of nanowires varied with the kind of catalyst. As increasing synthesis temperature,the morphology of gallium oxide nanowires changed from nanowires to nanorods, and its diameter increased. From these results, we could be proposed that the growth mechanism of β-Ga2O3 nanowires was changed with synthesis temperature of nanowires. Microstructure and morphology of Synthesized nanowire was characterized by HR-TEM, FE-SEM, EDX and XRD.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号