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不锈钢椭圆封头热压制裂纹分析

石油化工设备 2005年第3期34卷 65-67页

作者：梁方杰巨化集团公司工程公司浙江衢州324004

热压制是压力容器封头制造中常见的工艺之一。对不锈钢椭圆封头,其压制工艺过程特殊。通过一次质量事故分析,提出了不锈钢椭圆封头热压制过程中影响裂纹形成的因素。

关键词：椭圆封头不锈钢裂纹热压制

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热压法获得Zn-Al共析组织的研究

机械工程材料 2002年第9期26卷 7-9,40页

作者：韩彬李世春邹增大山东大学新材料研究中心山东济南250061 石油大学机电工程学院山东东营257061

用压制烧结、热压烧结等不同工艺制备出块状Zn 5Al试样 ,用热压烧结得到了更细密的两相相间排列的Zn Al共析组织。结果表明 :Zn 5Al粉末压制试样的密度随压制压力的增大而升高 ;压制压力为 35 0MPa时 ,烧结后密度变大 ,但压制压力为 90 ... 详细信息

用压制烧结、热压烧结等不同工艺制备出块状Zn 5Al试样 ,用热压烧结得到了更细密的两相相间排列的Zn Al共析组织。结果表明 :Zn 5Al粉末压制试样的密度随压制压力的增大而升高 ;压制压力为 35 0MPa时 ,烧结后密度变大 ,但压制压力为 90 0MPa时 ,烧结后密度变小 ;压制和烧结后锌相和铝相的晶格常数都变大 ,但压制压力的增大和烧结条件的改变对晶格常数无明显的影响 ;原子沿晶界 (相界 )和自由表面的扩散在Zn

关键词：热压制共析组织密度晶格常数扩散锌铝合金

Synthesis of high-purity Ti_2AlN ceramic by hot pressing

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中国有色金属学会会刊：英文版 2008年第1期18卷 82-85页

作者：严明陈艳林梅炳初朱教群 College of Chemistry and Environmental Engineering Hubei University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

High-purity Ti2AlN ceramic was prepared at 1300 ℃ by hot pressing(HP)of Ti/Al/TiN powders in stoichiometric *** sintered product was characterized using X-ray diffraction(XRD)and MDI Jade 5.0 software(Materials Data Inc,Liverpool,CA).Scanning electron microscopy(SEM)and electron probe micro-analysis(EPMA)coupled with energy-dispersive spectroscopy(EDS)were utilized to investigate the morphology *** results show that Ti2AlN phase is well-developed with a close and lamellar *** grains are plate-like with the size of 3-5 μm,thickness of 8-10 μm and elongated *** density of Ti2AlN is measured to be 4.22 g/cm3,which reaches 97.9% of its theory *** distribution of Ti2AlN grains is homogeneous.

关键词： Ti2AlN 合成方法热压制烧结方法

Warm compaction of Al_2O_3 particulate reinforced powder metallurgy iron-base composite

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中国有色金属学会会刊：英文版 2002年第5期12卷 886-889页

作者：倪东惠陈维平肖志瑜邵明张双益 College of Mechanical Engineering South China University of Technology Guangzhou 510640

Mechanical properties of the warm compacted alumina particulate reinforced powder metallurgy composite materials was compared with those of the materials obtained by conventional cold compaction. Factors affecting the properties of the warm compacted material such as compaction temperature, lubricant content and alumina content were studied. A 3%(mass fraction) alumina particulate reinforced iron-base composite with a green density of 7.0 g/cm 3 can be obtained by pressing the powder with a pressure of 700 MPa at 175 ℃. The sintered materials have a density of 6.88 g/cm 3, a tensile strength of 512 MPa and an elongation of 1.3%. Results show that as alumina content increases, density and mechanical properties of the composite decrease.

关键词：热压制粉末冶金氧化铝微粒强化离子基合成物机械性能

Synthesis of Ti_2AlC by hot pressing and its mechanical and electrical properties

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中国有色金属学会会刊：英文版 2007年第5期17卷 1001-1004页

作者：王苹梅炳初洪小林周卫兵 School of Science Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Ti2AlC bulk material was synthesized by hot pressing of mixture powders of TiC, Ti, Al and active carbon. The phase compositions of resultant product at different temperature were detected by X-ray diffractometer. The microstructures of the samples were observed by SEM. Finally, the mechanical properties and thermal properties of the sample at 1400 ℃ were measured. The results show that high purity Ti2AlC material with little Ti3AlC2 can be synthesized by hot pressing 0.5TiC/1.5Ti/1.0Al/0.5C at 1 400 ℃. Ti2AlC exhibits high mechanical properties and metallic electrical properties. Its fracture toughness is 7.0 MPa·m1/2, its flexural strength is 384 MPa at room temperature, and its electrical conductivity is 2.56×106 Ω1·m-1 at room temperature.

关键词：热压制 Ti2AlC 机械力学电工材料

Effects of warm compaction on mechanical properties of sintered P/M steels

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Journal of Central South University of Technology 2007年第4期14卷 447-451页

作者：易健宏叶途明彭元东夏庆林王红忠 State Key Laboratory of Powder Metallurgy Central South University

The green and sintered densities,and tensile strength of sintered P/M steels produced by cold compaction,warm compaction,warm compaction combined with die wall lubrication(DWL)were measured under various compaction pressures using polytetrafluoroethylene(PTFE)emulsion as the die wall *** effects of warm compaction on the mechanical properties were *** tensile fracture behaviors of cold compaction and warm compaction were studied using scanning electron microscope(SEM).The results show that the density of sintered P/M steel prepared by warm compaction or warm compaction with DWL is higher than that by cold compaction under all compaction ***,the highest tensile strength is obtained by combination of warm compaction and die wall lubrication under all compaction *** SEM results show that the fracture modes of the sintered samples prepared by cold compaction and warm compaction at 700 MPa are the mixed mode of ductile fracture and brittle fracture,and obvious dimples can be found in some *** fracture of sample prepared by cold compaction is uneven and has irregular and big pores,but that by warm compaction is relatively even and the pores are round mostly,and the samples have many obvious dimples on the whole fracture surface.

关键词：粉末冶金热压制机械工具钢材

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定向刨花板产业在中国的发展机遇

国际木业 2014年第9期44卷 2-5页

作者：郭文静中国林业科学研究院木材工业研究所北京100091

国外定向刨花板行业状况根据《LY/T1580-2010定向刨花板》的定义：定向刨花板（Oriented strand board,OSB）是由规定形状和厚度的木质大片刨花施胶后定向铺装,再经热压制成的多层结构板材,其表层刨花沿板材的长度或宽度方向定向排列。

关键词：定向刨花板中国产业行业状况多层结构定向排列热压制板材

An experimental investigation of wire electrical discharge machining of hot-pressed boron carbide

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Defence Technology（防务技术） 2015年第4期11卷 344-349页

作者： Ravindranadh BOBBILI V.MADHU A.K.GOGIA Defence Metallurgical Research Laboratory

The present work discusses the experimental study on wire-cut electric discharge machining of hot-pressed boron *** effects of machining parameters,such as pulse on time(TON),peak current(IP),flushing pressure(FP) and spark voltage on material removal rate(MRR)and surface roughness(R_a) of the material,have been *** parameters are found to have an effect on the surface integrity of boron carbide machined *** rate of brass wire increases with rise in input energy in machining of hot-pressed boron *** surfaces of machined samples were examined using scanning electron microscopy(SEM).The influence of machining parameters on mechanism of MRR and R_a was *** was demonstrated that higher TON and peak current deteriorate the surface finish of boron carbide samples and result in the formation of large craters,debris and micro *** generation of spherical particles was noticed and it was attributed to surface tension of molten ***-ridges were also observed on the surface due to protrusion of molten material at higher discharge energy levels.

关键词：电火花加工碳化硼热压制实验扫描电子显微镜材料去除率表面粗糙度电火花线切割

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双金属复合管件及管道预制成套工艺研究

双金属复合管件及管道预制成套工艺研究