共查询到20条相似文献，搜索用时 312 毫秒
1.
王均安 《上海大学学报(英文版)》2001,5(3):241-246
A review was made on the research progress of wear behavior of sintered steels in recent years.Wear is not an intrinsic property of sintered steels,which is strongly influenced by the wear test conditions.Howerver,many other factors that determine the mechanical properties of sintered steels also affect the wear behavior.Porosity has different effects on the wear of sintered steels depending on the application conditions.Under dry sliding condition ,higher porosity results in lower wear resistance.The influence of microstructures on wear resistance is in the order;Carbide,martensite,bainite and lamellar pearlite,The wear resistance increases with hardness,but this relationship changes with the porosity and microstructures of sintered steels. 相似文献
2.
用金属粉末注射成型的方法制备高硬度合金剪刀,其喂料使用440型不锈钢粉末和PEG/PMMA复合粘结剂制成。前人对该问题的研究主要集中在440型不锈钢粉末的PIM成型方法上,而本文结果表明:通过精确控制粉末的烧结条件和热处理工艺,就可以获得硬度高、粉末分布均匀、碳化物球化良好的制品。 相似文献
3.
4.
Ten studied steels including different carbon content, silicon content, and manganese content were deformed in compression over a temperature range of 600 C to 1 000 C at the strain rate of 1 s1. The curves of the mean flow stress-deformation temperature were drawn up. The mean flow stresses of higher carbon content steels decreased continuously as the applied deformation temperature increased in the whole temperature range, while the mean flow stress of lowest carbon steel displayed an abrupt drop near the two phases region. The reason for the abrupt drop phenomena was explained as the result of phase transformation. The mean flow stresses of steels with high silicon content and low manganese content also have this phenomena. 相似文献
5.
阐述了压铸法制备SiC/Al铝基复合材料的工艺,测试了碳化硅的粒径特性,并对碳化硅颗粒微观形貌进行了观察,采用湿法制备了碳化硅体积分数为60%碳化硅预制件素坯,并用该素坯制备了SiC/Al铝基复合材料。 相似文献
6.
钢结硬质合金工模具的加工方法、设计特点及应用 总被引：1，自引：0，他引：1
晁拥军 《温州职业技术学院学报》2002,2(3):26-28,31
钢结硬质合金是一种特性介于钢和硬质合金之间的新型金属材料，它既有硬质合金高硬度、高耐磨性的特点，也有钢的可加工性、可锻性，可焊性，可热处理性等特点，并已在机械工业、冶金工业、地质矿山和石化工业等领域得到了应用。研究钢结硬质合金的特性并进一步推广其应用，将有利于推进材料技术及相关领域的发展，能够创造出更大的经济、社会效益。 相似文献
7.
利用微波辅助溶胶—凝胶法合成碳化硅,既延续了溶胶凝胶技术高纯度、高均匀性以及合成温度低等优点,又兼具微波合成技术设备需求简便、反应时间短、操作便捷的特点,对工业化应用具有重要的意义. 相似文献
8.
碳钢／钢结硬质合金覆层材料制备及界面分析 总被引：1，自引：0，他引：1
采用爆炸压实成形和低真空液相烧结扩散串联工艺在钢板表面制备钢结硬质合金覆层（SBCTC）．用SEM、硬度测试和EDS元素分布分析等方法证实碳钢／钢结硬质合金覆层（CSTC）界面．结果表明：CSTC结合界面致密性好,沿着界面法向方向Fe,C,W主要元素分布呈现明显梯度分布．W元素向碳钢一侧渗透超过100μm,由复式碳化物导致SBCTC侧硬度值达600—700HV之间．沿着CSTC界面法向（由SBCTC侧指向碳钢侧）扩散区硬度渐趋下降． 相似文献
9.
The hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass is studied from ambient temperature to the temperature over Tx （the onset crystallization temperature） using a hot macro-hardness tester and scanning electron microscopy （SEM）. The results show that the hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass can be classified into 4 zones： the glassy zone in which the hardness almost linearly decreases with the increase of temperature, the viscoelastic zone in which the hardness is nearly unchanged, the viscous flow zone in which the hardness quickly tends towards near zero with temperature, and the crystallization zone in which the hardness sharply increases. The high temperature deformation behavior and the easy processable deformation region for bulk metallic glasses are also discussed on the basis of the hot marco-hardness. 相似文献
10.
LI Jun TIAN Rui XIAO Xue-shan School of Materials Science Engineering Shanghai University Shanghai P.R.China 《上海大学学报(英文版)》2007,(5)
The hot hardness behavior of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) bulk metallic glass is studied from ambient temperature to the temperature over T_x (the onset crystallization temperature) using a hot macro-hardness tester and scanning electron microscopy (SEM).The results show that the hot hardness behavior of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) bulk metallic glass can be classified into 4 zones:the glassy zone in which the hardness almost linearly decreases with the increase of temperature,the viscoelastic zone in which the hardness is nearly unchanged,the viscous flow zone in which the hardness quickly tends towards near zero with temperature,and the crystallization zone in which the hardness sharply increases.The high temperature deformation behavior and the easy processable deformation region for bulk metallic glasses are also discussed on the basis of the hot marco-hardness. 相似文献
11.
WANG Jun-an LI Qiang YAO Mei-yi ZHOU Bang-xin Institute of Materials School of Material Science Engineering Shanghai University Shanghai China 《上海大学学报(英文版)》2000,(Z1)
1 IntroductionElectrical steels have been researched and developedfor more than one cense for their great application inpower and electronic devices. Nowadayshigh-Performance silicon steels are widely used inproducing high power generator and Precision adapterand so on. High oriented silicon steels have goodmagnetic induction and less iron loss. Depending on therequirements of electrical indusal and electronics devices,tWo typical cold-rolled silicon steel sheets are Produced inindusal i.e.,… 相似文献
12.
Over the past several decades, the texture, properties and manufacture of quality silicon steels have been investigated for
application in magnetic devices requiring magnetically soft materials, such as transformers, inductive devices, etc. Most recently, the factors
effecting the texture and magnetic properties, e.g. impurities, rolling process and annealing process, have been greatly studied. The benefits
of this study are that low core loss silicon steels with stable high-performance can be obtained through an economic production process. This
review is intended to summarize the recent developments in the texture, properties, manufacture and application of oriented silicon steel
sheets. 相似文献
13.
童和平 《广东广播电视大学学报》2014,(1):109-112
基于集群磁流变效应超光滑平面抛光理论及试验装置对单晶碳化硅基片进行了平面抛光试验,结果表明,金刚石磨料对单晶Sic基片具有较高的材料去除率;加工间隙在1．5I砌左右具有较好的加工效果,随着加工时间的延长表面粗糙度越来越小,且30min内表面粗糙度变化率达到89％以上。通过优化工艺参数对单晶SiC进行集群磁流变平面抛光,发现经过30min加工,表面粗糙度Ra从42．1m下降到4．2nm,表明集群磁流变效应平面抛光用于加工单晶SiC基片可行且效果显著。 相似文献
14.
Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 ℃ and 8 MPa have been reported in this paper.SiCNTs with special morphology were characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM).There are two kinds of silicon carbide with special morphology:One is oval SiCNTs with small aspect ratio,the other is bamboo cone-shape structure.SiCNTs have been analyzed by fluorescence spectrometer.The results indicate that the SiCNTs have strong photoluminescence (PL) property.The SiCNTs with oval shape are one kind of intermediate state of growth process of nanotube.The growth mechanism of silicon nanotubes has been proposed based on experiment data.The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the growth process play the important role in SiCNTs with special structure. 相似文献
15.
Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 °C and
8 MPa have been reported in this paper. SiCNTs with special morphology were characterized by transmission electron microscopy
(TEM) and high-resolution TEM (HRTEM). There are two kinds of silicon carbide with special morphology: One is oval SiCNTs
with small aspect ratio, the other is bamboo cone-shape structure. SiCNTs have been analyzed by fluorescence spectrometer.
The results indicate that the SiCNTs have strong photoluminescence (PL) property. The SiCNTs with oval shape are one kind
of intermediate state of growth process of nanotube. The growth mechanism of silicon nanotubes has been proposed based on
experiment data. The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the
growth process play the important role in SiCNTs with special structure. 相似文献
16.
太阳能多晶硅铸锭用熔融石英坩埚氮化硅涂层的制备 总被引：1，自引：0，他引：1
熔融石英坩埚是生产太阳能多晶硅铸锭的必要容器,为脱模方便,需在其内表面喷涂一层氮化硅．采用高纯氮化硅粉在国产石英坩埚上喷涂,研究喷涂氮化硅浆液时石英基底温度和涂膜厚度对石英坩埚氮化硅涂层结合强度的影响．结果表明：采用高纯氮化硅粉喷涂石英坩埚基底,温度应在40℃以下且喷涂涂层厚度不宜超过80μm． 相似文献
17.
18.
目前在科技研究,工业生产等各行业中,对于位移角度的高精度测量都是不可或缺的。利用光栅传感器完成测量是目前的主要方法。光栅传感器利用光电转换的原理将位移、角度等几何量转换为电信号,该信号经过整形、细分后输出给后级电路完成对信号的处理,最后得到位移、角度的大小方向。本文在分析光栅传感器工作原理的基础上,提出借助CMOS图像传感器代替传统的硅光电池检测莫尔条纹,完成信号的细分,实现对位移角度的高精度测量。 相似文献
19.
Pd77Cu6Si17 （PCS） tbin film metallic glasses （TFMGs） with high glass forming ability and hardness were selected as a hard coating for improving the surface hardness ofAZ31 magnesium alloy. Both microindentation and nanoindentation tests were conducted on specimens with various PCS film thicknesses from 30 to 2000 nm. The apparent hardness and the relative indenta- tion depth （fl） were integrated using a quantitative model. The interaction parameters involved and relative hardness values were extracted from iterative calculations. According to the results, surface hardness can be enhanced greatly by PCS TFMGs in the shallow region, followed by gradual decrease with increasing fl ratio. In addition, specimens with thinner coatings （e.g., 200 nm） showed greater substrate-film interaction and those with thick coatings （e.g., 2000 nm） became prone to film cracking. The op- timum TFMG coating thickness in this study was estimated to be around 200 nm. 相似文献
20.
本文制备的纳米SnO2/SiO2/TiO2溶胶凝胶,能够常温5～30℃成膜,可见条件下具有超亲水、防雾、自清洁的性能。其中水接触角为3.7°,最大透光率波长在555～565 nm处,增投率达3.89%。一年测试结果,涂膜玻璃比普通玻璃透光率提高8.32%（12次平均）。 相似文献