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Effects of gradient structure on the microstructures and properties of coated cemented carbides

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Journal of University of Science and Technology Beijing 2006年第4期13卷 363-367页

作者： Li Chen enxi wu Fei Yin Jia Li State Key Laboratory for Powder Metallurgy Central South University Changsha 410083 China Zhuzhou Cemented Carbide Cutting Tools Co. Ltd. Zhuzhou 412007 China

The effects of gradient structure on the microstructure and properties of coated cemented carbides were researched with optical microscopy （OM）, scanning electron microscopy （SEM）, strength measurements, and cutting tests. It shows that vacuum sintering of WC-Ti（C, N）-TaC-Co cemented carbides results in the formation of a surface ductile zone. The ductile zone prevents crack propagation and leads to the increase of transverse rupture strength of the substrate. The impact resistance of coated gradient inserts was obviously improved on the basis of maintaining resistance to abrasion and the forming mechanism of the gradient structure was also analyzed.

关键词： cemented carbide chemical vapor deposition (CVD) coating gradient structure

MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Ti(C,N) FILMS DEPOSITED BY PEMSIP

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中国有色金属学会会刊：英文版 1999年第2期9卷 143-147页

作者： Li, Sheng Wang, Yukui wu, enxi Han, Huimin Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＰｌａｓｍａＥｎｈａｎｃｅｄＭａｇｎｅｔｒｏｎＳｐｕｔｅｒｉｎｇＩｏｎＰｌａｔｉｎｇ（ＰＥＭＳＩＰ）ｉｓａｎｅｗｋｉｎｄｏｆＰｈｙｓｉｃａｌＶａｐｏｒＤｅｐｏｓｉｔｉｏｎ（ＰＶＤ），ｗｈｉ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＰｌａｓｍａＥｎｈａｎｃｅｄＭａｇｎｅｔｒｏｎＳｐｕｔｅｒｉｎｇＩｏｎＰｌａｔｉｎｇ（ＰＥＭＳＩＰ）ｉｓａｎｅｗｋｉｎｄｏｆＰｈｙｓｉｃａｌＶａｐｏｒＤｅｐｏｓｉｔｉｏｎ（ＰＶＤ），ｗｈｉｃｈｂａｓｅｄｏｎｔｒａｄｉｔｉｏ...

关键词： PEMSIPinterlayeradhesion strengthcrystalline orientation relationship

THERMAL DEBINDING OF A NEW BINDER

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中国有色金属学会会刊:英文版 1997年第4期7卷 108-111页

作者： Zhou Jicheng Huang Baiyun wu enxi Yu Ligong Qu Xuanhui National Key Laboratory for Powder Metallurgy Central South University of TechnologyChangsha 410083 Changsha Railway University Changsha 410075

The thermal debinding of new binder in cemented carbide's extruding compacts and its debinding mechanism have been studied here. When the low molecular mass components (LMMC) in these new binder systems are changed, their thermogravimetric analysis (TGA) curves are very different. As the paraffin wax is the main LMMC, the new binder has been removed in two different temperature zones; while the temperature is at 240 ℃, the LMMC have been almost totally debinded. When a kind of short time polymer X is the main LMMC, there are no zones of low temperature debinding in the TGA curves. The differential thermal analysis curves show that a new single phase microstructural material composing with X and polymer A has been made in these cases.

关键词： cemented carbide extrusion pressing binder formulation thermal debnding

Sintering characteristics and microstructure of WC-Co-VC/Cr_3C_2 ultrafine cemented carbides

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Rare Metals 2009年第5期28卷 482-486页

作者： LEI Yiwen wu enxi School of Mechanical and Electronic Engineering Tianjin Polytechnic University Tianjin 300160 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

The sintering characteristics, microstructure, and mechanical properties of ultrafine WC-12%Co-0.2%VC/0.5%Cr3C2 cemented carbides were investigated. Dilatometric and differential thermal analyses （DTA） indicate that the compacts start to shrink at 600°C, the shrinkage rate peak is at 1190°C, and the liquid formation temperature is lower than the W-C-Co eutectic temperature （1330°C）. Microstructure analysis results show that the cemented carbides with fine and homogeneous microstructure were obtained when sintered at 1430°C. Continuous and discontinuous grain growth was suppressed due to the synergistic action of VC/Cr3C2. The transverse rupture strength （TRS） of the samples reaches 4286 MPa, with the hardness HRA 92.1. The fine and homogeneous microstructure, alloy strengthening, and different phase constitutions of binder in the cemented carbides result in high hardness and TRS. Continuous and discontinuous grain growth was observed in the cemented carbide sintered at 1450°C, which results in significant decreases of hardness and TRS. It indicates that VC/Cr3C2 additions in the cemented carbides can only suppress the grain growth at a certain temperature.

关键词： cemented carbides sintering characteristic grain growth microstructure mechanical properties

Fe3O4/金属-有机框架复合材料合成及应用的研究进展

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山西大学学报(自然科学版) 2022年第2期45卷 451-464页

作者：冯思思武恩喜白羽婷山西大学化学生物学与分子工程教育部重点实验室分子科学研究所山西大学化学化工学院

金属-有机框架材料是一类新型多孔材料,由于其合成简单,比表面积大,孔径可调等特点在超级电容器、催化剂和吸附剂中得到了广泛的应用。磁性金属-有机框架复合材料是将金属-有机框架和磁性金属纳米粒子结合,通过两种材料的协同效应使金属... 详细信息

金属-有机框架材料是一类新型多孔材料,由于其合成简单,比表面积大,孔径可调等特点在超级电容器、催化剂和吸附剂中得到了广泛的应用。磁性金属-有机框架复合材料是将金属-有机框架和磁性金属纳米粒子结合,通过两种材料的协同效应使金属-有机框架材料的部分原有性能增强,甚至使复合材料集成新的性能,形成具有优异协同性能的复合材料,解决金属-有机框架材料稳定性差、机械强度弱、不易回收等问题,拓展其应用范围。文章综述了目前研究中最常使用的磁性金属纳米粒子Fe3O4与金属-有机框架形成的复合材料的合成和应用的最新进展。详细介绍了混合法、嵌入法、逐层生长法、干凝胶转化法等合成Fe3O4/金属-有机框架复合材料的方法,并且讨论了复合材料在环境修复,生物医药,催化和化学分析中的应用。最后,对Fe3O4/金属-有机框架复合材料的发展和应用提出了未来展望。

关键词：金属-有机框架四氧化三铁磁性框架复合材料合成方法应用

GRINDING RESIDUAL STRESS OF CEMENTED CARBIDE

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中国有色金属学会会刊：英文版 1993年第1期3卷 49-52,57页

作者： Qian, Chongliang wu, enxi Lu, Haibo Central South University of Technology. Changsha 410083. China Chen, Ruikuan She, Zhenhui wu, Chunhua Zhenzhou Cemented Carbide Industry Company. Zhenzhou 412000. China

Grinding residual stress in the surface layer of WC-6 Wt—％Co hard alloy was measured by means of X-ray diffraction. The effects of various grinding parameters and treatment processes on the stress were studied. By means of electrolytic etching, the stress distribution along the depths beneath the surface was measured. The relationship between the stress and the service life of the alloy is discussed.

关键词： residual stress hard alloy X-ray diffraction

DEVELOPMENT OF MATERIAL USED FOR AVIATION APPARATUS AXLE JOURNALS

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中国有色金属学会会刊：英文版 1998年第2期8卷 19-24页

作者： wu enxi, Li Shen, Qian Chongliang and Zou ZhiqiangState Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China

ＤＥＶＥＬＯＰＭＥＮＴＯＦＭＡＴＥＲＩＡＬＵＳＥＤＦＯＲＡＶＩＡＴＩＯＮＡＰＰＡＲＡＴＵＳＡＸＬＥＪＯＵＲＮＡＬＳ①ＷｕＥｎｘｉ，ＬｉＳｈｅｎ，ＱｉａｎＣｈｏｎｇｌｉａｎｇａｎｄＺｏｕＺｈｉｑｉａｎｇＳｔａｔｅＫｅｙ... 详细信息

ＤＥＶＥＬＯＰＭＥＮＴＯＦＭＡＴＥＲＩＡＬＵＳＥＤＦＯＲＡＶＩＡＴＩＯＮＡＰＰＡＲＡＴＵＳＡＸＬＥＪＯＵＲＮＡＬＳ①ＷｕＥｎｘｉ，ＬｉＳｈｅｎ，ＱｉａｎＣｈｏｎｇｌｉａｎｇａｎｄＺｏｕＺｈｉｑｉａｎｇＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｆｏｒＰｏｗｄ...

关键词： Co25W alloy axle journals consumableelectrode melting wiredrawing agehardening

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硬质合金深冷处理

硬质合金 2007年第2期24卷 96-98页

作者：张平吴恩熙中南大学粉末冶金国家重点实验室

本文简要介绍了一种程控深冷处理装置的结构和性能,并介绍了几种不同牌号的硬质合金经深冷处理后性能的变化情况。

关键词：深冷处理结构性能硬质合金

(Ti,Al)N单层和TiN/(Ti,Al)N多层涂层的物理及力学性能研究

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粉末冶金技术 2006年第4期24卷 271-274页

作者：陈利吴恩熙尹飞汪秀全中南大学粉末冶金国家实验室

借助EPMA、XRD、SEM、纳米压痕、EDX、Rockwell A压痕、强度测试和切削实验研究了采用磁控溅射法在硬质合金基体上沉积的(Ti,Al)N单层和Ti N/(Ti,Al)N多层涂层的物理和力学性能。研究结果表明:两种涂层均与基体结合紧密,(Ti,Al)N为面心... 详细信息

借助EPMA、XRD、SEM、纳米压痕、EDX、Rockwell A压痕、强度测试和切削实验研究了采用磁控溅射法在硬质合金基体上沉积的(Ti,Al)N单层和Ti N/(Ti,Al)N多层涂层的物理和力学性能。研究结果表明:两种涂层均与基体结合紧密,(Ti,Al)N为面心立方结构;Ti N/(Ti,Al)N多层涂层具有更高的硬度、更低的脆性和更好的切削性能。

关键词：物理气相沉积 (Ti A1)N单层涂层 TiN/(Ti A1)N多层涂层