Semiconductor pigment of Cd-Zn-S is synthesized through the solid state reaction method and its structure and surface morphology is characterized by X-ray diffraction (XRD) and scanning electron microscope(SEM). It is...Semiconductor pigment of Cd-Zn-S is synthesized through the solid state reaction method and its structure and surface morphology is characterized by X-ray diffraction (XRD) and scanning electron microscope(SEM). It is demonstrated that the crystal lattice of the product is hexagonal. When the heat treatment temperature increases, the distortion of crystal lattice reduces. The samples annealed at different temperatures agglomerate to different degrees while the one annealed at higher temperature agglomerates clearly. The infrared emissivity of Cd-Zn-S at two window-bands of 3-5 μm and 8-14 μm is researched. The researched result shows that the infrared emissivity of Cd-Zn-S in 8-14 μm wave bands is much higher than that in 3-5 μm wave bands. The infrared emissivity decreases with the increasing of heat treatment temperature, which reason is that with the increasing of temperature, the infrared absorption decreases and the scatter by the particles rises.展开更多
电子束选区熔化成形技术(Selective Electron Beam Melting,SEBM),是20世纪90年代中期发展起来的一类新型增材制造技术,具有能量利用率高、无反射、功率密度高、扫描速度快、真空环境无污染、低残余应力等优点,特别适合活性、难熔、脆...电子束选区熔化成形技术(Selective Electron Beam Melting,SEBM),是20世纪90年代中期发展起来的一类新型增材制造技术,具有能量利用率高、无反射、功率密度高、扫描速度快、真空环境无污染、低残余应力等优点,特别适合活性、难熔、脆性金属材料的直接成形,在航空航天、生物医疗、汽车、模具等领域具有广阔的应用前景。10年来,作者团队主要开展SEBM成形钛合金的研究,合金包括TC4、TA7、Ti600、Ti Ta Nb Zr、Ti Al金属间化合物等;零件包括复杂薄壁、桁架/多孔及多孔/致密复合结构零件;并且搭建了从粉末制备、设备研发到技术服务的全产业链SEBM技术平台,通过科技成果转化成立了从事SEBM技术的专业化企业——西安赛隆金属材料有限责任公司。从成形装备、成形过程缺陷形成与控制、材料组织性能和主要应用4个方面,对国内外SEBM技术的发展现状进行了综述,最后对SEBM技术的发展前景进行了展望。展开更多
基金Chinese Postdoctoral Fund (2006040931)National Natural Science Foundation of China (90505008)
文摘Semiconductor pigment of Cd-Zn-S is synthesized through the solid state reaction method and its structure and surface morphology is characterized by X-ray diffraction (XRD) and scanning electron microscope(SEM). It is demonstrated that the crystal lattice of the product is hexagonal. When the heat treatment temperature increases, the distortion of crystal lattice reduces. The samples annealed at different temperatures agglomerate to different degrees while the one annealed at higher temperature agglomerates clearly. The infrared emissivity of Cd-Zn-S at two window-bands of 3-5 μm and 8-14 μm is researched. The researched result shows that the infrared emissivity of Cd-Zn-S in 8-14 μm wave bands is much higher than that in 3-5 μm wave bands. The infrared emissivity decreases with the increasing of heat treatment temperature, which reason is that with the increasing of temperature, the infrared absorption decreases and the scatter by the particles rises.
文摘电子束选区熔化成形技术(Selective Electron Beam Melting,SEBM),是20世纪90年代中期发展起来的一类新型增材制造技术,具有能量利用率高、无反射、功率密度高、扫描速度快、真空环境无污染、低残余应力等优点,特别适合活性、难熔、脆性金属材料的直接成形,在航空航天、生物医疗、汽车、模具等领域具有广阔的应用前景。10年来,作者团队主要开展SEBM成形钛合金的研究,合金包括TC4、TA7、Ti600、Ti Ta Nb Zr、Ti Al金属间化合物等;零件包括复杂薄壁、桁架/多孔及多孔/致密复合结构零件;并且搭建了从粉末制备、设备研发到技术服务的全产业链SEBM技术平台,通过科技成果转化成立了从事SEBM技术的专业化企业——西安赛隆金属材料有限责任公司。从成形装备、成形过程缺陷形成与控制、材料组织性能和主要应用4个方面,对国内外SEBM技术的发展现状进行了综述,最后对SEBM技术的发展前景进行了展望。
