共查询到19条相似文献,搜索用时 109 毫秒
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庞前涛 《中国材料科技与设备》2008,5(3):45-47
本文主要介绍了一种粉末烧结技术——放电等离子烧结。首先从结构设计上进行了介绍,放电等离子烧结的主要原理是在粉末进行压力烧结的同时施加电流,最终实现材料的致密化。放电等离子烧结的主要优点是烧结温度低、时间短、升温快、材料致密等。最后列举了放电等离子烧结技术在热电材料、硬质材料、功能梯度材料等的应用实例,论述表明放电等离子烧结技术是一种可以制备高性能材料的烧结技术。 相似文献
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脉冲电流烧结技术的研究进展 总被引:1,自引:1,他引:0
脉冲电流烧结(Pulse electric current sintering,PECS)是材料科学领域开发出的一种新型快速烧结技术,已广泛应用于金属与合金、结构陶瓷、氧化物超时体、复合材料、热电材料、离电材料、高分子材料以及功能梯度材料的制备;检验结果,对脉冲电流烧结非导电性粉体的烧结过程和机理,提出自己的观点。 相似文献
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现代烧结技术在难熔金属材料中的应用 总被引:2,自引:0,他引:2
微波烧结、放电等离子体烧结、选择性激光烧结作为材料烧结致密化的新技术是活化烧结和快速烧结的有机结合,它们不仅具有升温速度快、烧结时间短、抑制晶粒长大、组织结构可控等独特的优势,而且还具有生产周期短、高效节能的巨大工业应用价值和前景,已成为当今材料领域的研究热点。难熔金属材料及其合金的烧结一直是难熔材料制备和烧结领域的难题,为了进一步探索难熔金属材料及其合金的新型烧结技术,探讨了微波烧结、放电等离子体烧结、选择性激光烧结在难熔金属材料及其合金制备中的应用现状,综述了其工作原理、特点及系统组成。 相似文献
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概述了超导磁体技术的研究进展,分析了超导磁体在NdFeB永磁材料制备过程中的应用前景,重点讨论了超导磁体在烧结NdFeB磁体、NdFeB铸锭组织、HDDR(氢化-歧化)工艺制备NdFeB纳米晶粉末等领域的具体应用情况. 相似文献
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SPS----一种制备高性能材料的新技术 总被引:7,自引:1,他引:6
0引言 块状体材料可以由不同的制备技术获得:物理或化学气相沉积技术从气相出发直接制备固态材料;溶融-冷凝及溶胶-凝胶技术从液相出发制备固态材料.然而,大量先进材料,如精细陶瓷、硬质合金、纳米复合材料等,都采用一种更普遍应用的技术--粉末烧结来合成,也即从固态的粉末出发制备致密的固态材料.这一过程的关键点是如何在实现致密化的前提下,有效地控制合成材料中晶粒的尺寸和形貌以及界面的适度结合. 相似文献
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Olivier Guillon Wolfgang Rheinheimer Martin Bram 《Advanced Engineering Materials》2023,25(18):2201870
Novel sintering methods have emerged in the recent past years, which have raised great interest in the scientific community. Relying on electric field effects, high heating rates, the use of mechanical pressure, or hydrothermal conditions, they offer fundamental advantages compared to conventional sintering routes like minimizing the energy consumption and enhancing the process efficiency. This perspective aims at explaining these effects in a general way and presenting the status quo of using them for the processing of high-performing ceramic materials. In detail, this work focuses on flash sintering, ultrafast high-temperature sintering, spark plasma sintering, cold sintering, and photonic sintering methods based on different light sources. The specificities, potentials, and limitations of each method are compared, especially in the light of a possible industrialization. 相似文献
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Vipin C. Shukla 《Materials and Manufacturing Processes》2017,32(1):108-114
The importance of magnetic abrasive powder (MAP) in finishing the surface of work materials as a flexible cutting tool in the presence of a magnetic field during the ultrasonic assisted magnetic abrasive finishing (UAMAF) process is quite evident. A sufficiently intense magnetic field provides the desired magnetic force to the iron particles. This holds nonmagnetic abrasive particles firmly and thus makes flexible chains. However, at higher rotational speeds of the magnet due to the requirement of high centripetal force, the chains start flying away from the finishing zone. In the present work, to overcome this deficiency, bonded MAPs were developed using the sintering technique. The effect of various process parameters on the magnetic property (magnetization) of sintered MAPs was investigated. Design of experiments (DoE) was planned as per the L8 orthogonal array of the Taguchi method, and magnetizations along with M-H curves for all eight different MAPs were measured. Subsequently, analysis of experimental data was carried out using various techniques to optimize the process parameters. It was observed that sintering temperature affects magnetization the most. Scanned microscopy (SEM) and X-ray diffraction (XRD) analysis were also carried out to investigate bonding strength in sintered MAP. 相似文献
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DongmingZHANG ZhengyiFU JingkunGUO 《材料科学技术学报》2003,19(6):526-528
Microstructure of reaction sintering of ZnAl2O4 at 1500℃ by hot-pressing(HP) and pulse electric current was investigated. The results indicated that the existed cracks in sintered body were caused by structure mismatch. It is the evidence that periodical temperature field existed during pulse electric current sintering of nonconductive materials.The distance between high temperature areas was related to die diameter. 相似文献
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AbstractWe have studied the combined effects of the templated grain growth and magnetic alignment processes on sintering, anisotropic sintering shrinkage, microstructure development and texture in ZnO ceramics. Suspensions of 0–10 vol % ZnO template particles were slip cast in a 12 T rotating magnetic field. Sintering and texture characteristics were investigated via thermomechanical analysis and electron backscatter diffraction, respectively. Sintering as well as texture characteristics depend on template concentration. For the studied ZnO system, there is a critical template concentration (2 vol % in this study) above which densification is limited by the templates owing to constrained sintering. Below this limit, the densification is enhanced and the anisotropic shrinkage is reduced, which is attributed to densifying characteristics of the templates. 相似文献
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《Materials and Manufacturing Processes》2007,22(5):623-633
Possibilities for manufacturing cellular metallic materials are reviewed. However, this study primarily concerns the role of a cell-wall structure in influencing the mechanical behavior of metallic foams. A porous low-carbon steel with a controlled porous structure is processed from spark plasma sintering of ferromagnetic metal segments with a special, elongated shape. The ferromagnetic metal segments are filled into a die-block and their orientation is settled by a static magnetic field. The cell-wall structures of the porous low-carbon steel can be modified in order to improve its performance because differences in the cell-wall structure substantially affect the mechanisms of deformation and failure under different types of loading. The optimal shape of the structure following the required macroscopic mechanical response is established by means of the search scheme of an evolution strategy. 相似文献
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Room Temperature Electrochemical Sintering of Zn Microparticles and Its Use in Printable Conducting Inks for Bioresorbable Electronics 下载免费PDF全文
Yoon Kyeung Lee Jeonghyun Kim Yerim Kim Jean Won Kwak Younghee Yoon John A. Rogers 《Advanced materials (Deerfield Beach, Fla.)》2017,29(38)
This study describes a conductive ink formulation that exploits electrochemical sintering of Zn microparticles in aqueous solutions at room temperature. This material system has relevance to emerging classes of biologically and environmentally degradable electronic devices. The sintering process involves dissolution of a surface passivation layer of zinc oxide in CH3COOH/H2O and subsequent self‐exchange of Zn and Zn2+ at the Zn/H2O interface. The chemical specificity associated with the Zn metal and the CH3COOH/H2O solution is critically important, as revealed by studies of other material combinations. The resulting electrochemistry establishes the basis for a remarkably simple procedure for printing highly conductive (3 × 105 S m?1) features in degradable materials at ambient conditions over large areas, with key advantages over strategies based on liquid phase (fusion) sintering that requires both oxide‐free metal surfaces and high temperature conditions. Demonstrations include printed magnetic loop antennas for near‐field communication devices. 相似文献