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正向电压对赤泥等离子体电解氧化层结构和耐蚀性的影响
赤泥 等离子体电解氧化技术 5005铝合金 正向电压 耐腐蚀性能
2019/11/5
以赤泥(RM)为电解液添加剂,采用等离子体电解氧化(PEO)技术在5005铝合金表面制备一层复合陶瓷层,研究了不同正向电压对陶瓷层厚度、组织结构和耐腐蚀性能的影响。结果表明:随正向电压的升高,陶瓷层生长加快,厚度增大,氧化时间为20 min时,陶瓷层的最大厚度可达35.33 μm;陶瓷层的表面粗糙度不断增大,最小为0.68 μm,最大可达4.21 μm;陶瓷层的表面孔隙率先减小后增大,最小为24....
Mechanical approach of PP/MMT polymer nanocomposite
Engineering materials MMT Polymer nanocomposites Polymer processing
2010/8/17
Features like mechanical properties and morphology of injection moulded composites, strongly depend on thermomechanical processing variables [1]. It is noteworthy that by compounding and processing (t...
Torsional fatigue behaviour and damage mechanisms in the very high cycle regime
Damage mechanisms Ultrasonic fatigue Cyclic torsion Very high cycle regime SEM
2010/8/17
The fatigue of materials in the very high cycles (VHCF) regime (>107 cycles) has been studied in the past 20 years to understand the fatigue damage mechanism of mechanical parts subjected to very high...
Cost calculation of constructions series of types
Cost calculation constructions series types
2010/8/12
To be competitive on modern market, which changes very dynamically, the producer has to readjust to customers expectations. The technological progress is still speeding up and this creates very hard t...
Behaviour of nitrided layers subjected to influence of hydrogen
Corrosion Plasma nitriding Hydrogen permeation and uptake Hydrogen embrittlement
2010/8/17
High-strength steels may exhibit severe loss of ductility, toughness and strength due to hydrogen embrittlement (HE), resulting in sudden fracture or delayed failure. The susceptibility of steels to H...
Nanomechanical properties of silicon surfaces nanostructured by excimer laser
Nanomechanical properties silicon surfaces nanostructured excimer laser
2010/10/12
Excimer laser irradiation at ambient temperature has been employed to produce nanostructured silicon surfaces. Nanoindentation was used to investigate the nanomechanical properties of the deformed sur...
A comparative approach to modelling of hard tissues
CAD Modelling Manufacturing Customized Implant
2010/8/17
In recent years biomedical engineering has opened a new window to CAD and this technology has been extensively used in many application areas. Among these, modelling hard tissues has been of interest ...
FEM applications to model friction processes in plastic strain conditions
Analysis and modelling CAD/CAM Process Systems Design FEM analysis Tribo-meter
2010/8/17
One of the basic problems in different aspects of movement is the determination of frictional resistance occurring in the analyzed friction node. Plastic working processes are also included in such ge...
Compaction of the diamond – Ti3SiC2 graded material by the high – speed centrifugal compaction process
High-speed centrifugal compaction process Sedimentation Barnea-Mizrahi equation
2009/12/1
Purpose: Sedimentation of particles in a viscous fluid is a main physical problem in fluid mechanics.
Sedimentation is benchmark of one of the technica; methods to produce the functionally graded mat...
钙钛矿型铋铁氧体纳米微粒的弱铁磁性
铁氧体 纳米微粒 弱铁磁性
2009/11/11
采用溶胶-凝胶法制备了不同粒径的纯净单相钙钛矿型BiFeO3纳米微粒. X射线衍射分析表明，BiFeO3纳米微粒仍为菱方结构，但晶格畸变随颗粒尺寸的减小而增大. 磁测量显示，BiFeO3纳米微粒具有明显弱铁磁性，且弱铁磁性随温度升高显著降低. 弱铁磁性的自发磁化强度随温度升高呈线性下降，磁化强度和磁化率均随颗粒尺寸的减小而增大. 穆斯堡尔谱分析揭示，颗粒愈小，自旋倾角愈大，其分布也愈宽. 从纳米微...
钛酸钾晶须的微波合成
微波 固相合成 晶须 钛酸钾
2009/11/9
应用微波合成技术，以碳酸钾和水合氧化钛为前驱体，CuO和Fe3O4为加热介质，合成出系列钛酸钾(K2Ti2O5, K2Ti4O9和K2Ti6O13)晶须和高结晶度的六钛酸钾粉末. 考察了微波加热介质、反应时间和反应Ti/K比等因素对产物物相和形貌的影响，证明微波条件下晶须的生长符合液相熔体诱导模型.
Ca掺杂及Ca--Sm和Ca--Gd复合掺杂CeO2基纳米粉体的制备
无机非金属材料 均相沉淀 掺杂氧化铈 纳米级固溶体
2009/10/16
以草酸铵为沉淀剂, 以尿素为pH调节剂, 以Ce(NO3)3 ?6H2O、Ca(NO3)2? 4H2O、Sm2O3和Gd2O3为起始原料, 采用改进的均相沉淀法合成前驱物, 将其在700℃焙烧4.5 h, 分别制备出Ca掺杂及Ca--Sm和Ca--Gd复合掺杂的CeO2 基纳米粉体. 用X射线衍射(XRD)、扫描电子显微镜(SEM)和BET法等技术对焙烧粉体的物相、形貌、晶粒尺寸及比表面积进行了分...
La掺杂对TiO2薄膜性能的影响
无机非金属材料 溶胶--凝胶法
2009/10/16
用溶胶--凝胶法制备TiO2以及La掺杂TiO2的前驱体凝胶, 将其均匀旋涂不同层数制备出不同厚度的薄膜, 研究了La掺杂对TiO2薄膜结晶性能、表面形貌、光学特性和亲水性能的影响. 结果表明: 在500℃可以获得结晶性良好的锐钛矿相TiO2薄膜; 随着La掺杂量的增加, 薄膜中TiO2晶粒会变大, 同时引起紫外可见光谱中吸收边的蓝移. 掺La的TiO2 薄膜经紫外照射后其接触角明显高于未掺杂样品...
磁控溅射制备SiC薄膜的高温热稳定性
无机非金属材料 磁控溅射 热稳定性
2009/10/16
采用磁控溅射方法在Si基底上制备SiC薄膜, 研究了SiC薄膜经不同温度和气氛条件高温退火前后结构、成份的变化. 结果表明, 薄膜主要以非晶为主, 由Si--C键, C--C键和少量Si的氧化物杂质组成; 在真空条件下经高温退火后, 薄膜C--C键的含量减少, 而Si--C键的含量增加, 真空退火有利于SiC的形成; 在800℃空气中退火后, 薄膜表面生成一层致密的SiO2薄层, 阻止了氧气与薄膜...