共查询到18条相似文献,搜索用时 144 毫秒
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透明尖晶石陶瓷的透过性能研究 总被引:1,自引:0,他引:1
采用高纯、超细的尖晶石粉末作为起始原料,用真空热压烧结结合热等静压法制备出透明尖晶石陶瓷制品,制品抛光后在3~5 μm波段的透过率最高达到86%以上.通过酸碱腐蚀和高温退火对材料进行耐腐蚀和耐高温性能研究.实验结果表明,该工艺制备的透明尖晶石陶瓷有较好的耐酸碱腐蚀性能和耐高温性能.通过镀膜可提高制品中波红外透过率,单面镀增透膜后制品3~5 μm透过率最高可到92%.结合其他性能数据,简要介绍透明尖晶石陶瓷已经取得的应用和在基片、窗口材料等方面潜在的应用. 相似文献
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红外光学材料是红外技术应用的基础之一。适用于3~5μm波段的中波红外光学材料正向高性能、大尺寸、低成本等方面发展,具有广阔的应用前景。介绍了尖晶石陶瓷、蓝宝石晶体和氟化镁多晶等中红外光学材料的基本性质,开展了制备技术、光学性能、力学性能和热学性能的研究,比较了温度对发射率、抗弯强度和热导率的影响。结果表明:尖晶石陶瓷具备较高的发射率;氟化镁多晶抗弯强度较差;蓝宝石晶体综合性能较佳,适用于制备基于高温应用的弧形光学器件。 相似文献
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本刊编辑部 《电子产品可靠性与环境试验》2015,(3)
据报道,美国海军研究实验室的研究人员利用一种烧结新技术,研制出透明的防弹尖晶石片。尖晶石是一种矿物质,比玻璃更耐用,并且可以在压力的作用下变成各种形状。据称,利用尖晶石材料可以制作透明盔甲,将被用于装甲车辆或用作防护面罩;也可用作手表、智能手机等日用消费品的外壳。由于红外光能够穿透这种物质,美国海军将利用其在沙子或盐水中可以轻易地将玻璃刮坏的特性来保护激光。 相似文献
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为了研究Nd:YAG多晶透明陶瓷作为激光增益介质的可能性,测量了掺杂原子数分数为1%的Nd:YAG多晶透明陶瓷的吸收光谱、荧光光谱、荧光寿命等光学参量,并和Nd:YAG单晶进行了比较。测量结果表明,Nd:YAG多晶透明陶瓷作为激光增益介质具有极大的潜力。 相似文献
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该文以氟化锂(LiF)为烧结助剂,通过热压烧结(HP)的方式制备出钇铝石榴石(Y_3Al_5O_(12),YAG)透明陶瓷。表征了YAG透明陶瓷的光学性能及微观结构,并结合电化学阻抗谱进一步分析了LiF对热压烧结YAG陶瓷性能的影响。结果表明,LiF作为烧结助剂有利于促进YAG陶瓷晶粒的增长,有助于提高YAG陶瓷的致密度;阻抗谱分析显示,添加较多LiF的YAG陶瓷的晶界电阻较大,这表明LiF有助于晶界处"碳污染"等杂质的排除。当w(LiF)=1.0%时,通过真空热压烧结在1 450℃、50 MPa保温1 h可以制备出高性能的YAG透明陶瓷,样品在400 nm波长处直线透过率为58%,在1 100 nm波长处直线透过率为68%,在2 500 nm波长处直线透过率达到75%。 相似文献
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介绍了透明MgAl2O4陶瓷的优异性能及应用领域,综述了该陶瓷烧结工艺的最新研究进展,包括热压烧结/热等静压烧结、常压烧结、放电等离子烧结、微波烧结,并对透明MgAl2O4陶瓷离子掺杂及纳米透明MgAl2O4陶瓷的研究现状进行了介绍,展望了透明MgAl2O4陶瓷的研究方向. 相似文献
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超音速导引头整流罩的气动光学效应对红外光电成像系统的跟踪、识别产生很大的影响。结合工程实际,主要开展了在6 km高空、飞行速度达到2.4 Ma的尖晶石整流罩的气动力学、气动光学效应的研究。首先,对设计的尖晶石整流罩进行了流场气动效应的仿真计算分析,并采用电弧风洞模拟试验进行了研究。接着根据试验结果,设计了尖晶石的热冲击试验,通过在尖晶石外表面镀制金刚石保护膜,实现了整流罩的消热设计。采用静态保温加热试验,研究了整流罩的气动加热对导引头跟踪成像的影响。最后,采用火箭橇模拟试验,研究了约2 Ma音速飞行的导引头的跟踪成像。初步分析了气动效应对尖晶石整流罩物理性能以及中波红外成像的影响。 相似文献
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报道了采用真空烧结法结合热等静压技术制备的Nd:Y2O3透明陶瓷的荧光光谱特性及相关激光输出。通过与Nd:YAG透明陶瓷的荧光光谱对比,表明Nd:Y2O3透明陶瓷的4F3/2-4I11/2跃迁光谱存在着多个增益相当的谱线,这更有利于实现同时双波长段激光振荡;不同斯塔克子跃迁光谱的离散特性有利于通过腔镜镀膜控制不同波长损耗,获得丰富的1.0~1.1 μm波段激光。利用简单的平平两镜腔结构完成进一步的实验,通过选择的输出镜片镀膜获得了输出功率3.62 W、转换效率40.4%的1074.6 nm和1078.8 nm的双波长输出和输出功率1.7 W、转换效率19.4%的1130.3 nm波长输出。 相似文献
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透明尖晶石陶瓷(TMAC)材料具有耐高温、耐腐蚀、较高的硬度和机械强度等优点,透过波段从紫外、可见、中波红外到微波,是性能优异的宽波段窗口材料,能够满足不断发展的光电系统对窗口材料的多重要求,且有广阔的应用前景。对采用热压烧结结合热等静压工艺制备出的TMAC材料进行了透过性能研究,分别对可见和红外波段镀制了增透膜,测试了不同入射角的红外透过率,并根据入射角的不同镀制了增透膜,测试了镀制金刚石膜后的透过率,并对毫米波波段的透过率做了初步测试和仿真,分析了不足和未来的研究方向。 相似文献
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Copper-matrix molybdenum particle composites made from copper coated molybdenum powder 总被引:1,自引:0,他引:1
Copper-matrix molybdenum particle composites containing 33 ~73 wt.% Mo were fabricated by hot pressing copper coated molybdenum
powder. For comparison, corresponding composites fabricated by hot pressing a mixture of copper and molybdenum powders were
also made. The former method gave composites of lower porosity, higher hardness, higher compressive yield strength, lower
coefficient of thermal expansion, lower electrical resistivity and higher thermal conductivity than the latter method. These
differences are partly due to the separation of the molybdenum particles by the copper coating in the former case. In contrast,
molybdenum particle clustering occurred in the latter case when the Mo content exceeded 53 wt.%. 相似文献
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Zong-Liang Tseng Lung-Chien Chen Jian-Fu Tang Meng-Fu Shih Sheng-Yuan Chu 《Journal of Electronic Materials》2017,46(3):1476-1480
Transparent conducting Nb-doped titanium oxide (NTO) films were deposited on a non-alkali glass substrate using an RF magnetron sputtering method with post-annealing. Structural, electrical and optical properties of the NTO films were found to be strongly dependent on film thickness. A resistivity of 4.2 × 10?3 Ω cm and an average visible transmittance of ~70% were obtained at the film thickness of 360 nm, indicating that the polycrystalline NTO fabricated by the sputtering method has sufficient potential as a transparent conducting oxide (TCO) candidate for practical applications. 相似文献
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Shabaldin A. A. Konstantinov P. P. Kurdyukov D. A. Lukyanova L. N. Samunin A. Yu. Stovpiaga E. Yu. Burkov A. T. 《Semiconductors》2019,53(6):742-746
Semiconductors - Nanocomposite thermoelectrics based on Bi0.45Sb1.55Te2.985 solid solution of p-type conductivity are fabricated by the hot pressing of nanopowders of this solid solution with the... 相似文献
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Yue Gong Li Yu Xiaolin Lyu Shixiang Zheng Yan Yu Piaopiao Zhou Zhong-Zhen Luo Zhigang Zou 《Advanced functional materials》2023,33(47):2305314
Flexible conductive materials capable of simulating transparent ocean organisms have garnered interest in underwater motion monitoring and covert communication applications. However, the creation of underwater flexible conductors that possess mechanical robustness, adhesion, and self-healing properties remains a challenge. Herein, hydrophobic interaction is combined with electrostatic interaction to obtain a solvent-free transparent poly(ionic liquid) elastomer (PILE) fabricated using soft acrylate monomers and acrylate ionic liquids. The synergy of hydrophobic and electrostatic interactions can eliminate the hydration of water molecules underwater, giving the PILE adjustable fracture strength, good elasticity, high stretchability, high toughness, fatigue resistance, underwater self-healing ability, underwater adhesion, and ionic conductivity. As a result, the transparent iontronic sensor generated from the PILE can achieve multifunctional sensing and human motion detection with high sensitivity and stability. In particular, the sensor can also transmit information underwater through stretching, pressing, and non-contact modes, demonstrating its huge potential in underwater flexible iontronic devices. 相似文献