Results 51 to 60 of about 271 (103)

稀土掺杂改性Zn-Bi基压敏陶瓷的研究进展

Dianci bileiqi
综述了近年来国内外稀土氧化物掺杂改性ZnO-Bi2O3（Zn-Bi）基压敏陶瓷的研究进展（2012年至2024年）。适量掺杂稀土氧化物可明显地减小Zn-Bi基压敏陶瓷的晶粒尺寸，并且使陶瓷晶粒尺寸大小分布均匀，提高陶瓷的致密度，可以有效地调控Zn-Bi基压敏陶瓷的综合性能和微观结构，可以显著地提高Zn-Bi基压敏陶瓷的电位梯度、降低漏电流密度、增大非线性系数等。掺杂1.2 mol% Y2O3的Zn-Bi基压敏陶瓷具有最好的综合电性能，电压梯度为2113 V/mm，非线性系数为184.6，漏电流密度为0 ...
陈映义, 陈甲天, 王新苗, 肖文华, 牛继恩   +4 more
doaj  

高电位梯度ZnO压敏电阻大电流冲击下电学性能的研究

Dianci bileiqi, 2009
通过Y2O3掺杂等工艺手段制备出具有高电位梯度值的ZnO压敏电阻,并进行大电流冲击条件下的电学性能测试。实验结果表明,在掺杂0.08%（摩尔浓度）Y2O3后,试样的电位梯度值达到2 460.5 V/mm,残压比为1.48,最大通流容量达到1 263 A,能量耐受密度达到404.7 J/cm3,具有良好的抵抗大电流冲击的性能。掺杂后的试样晶粒尺寸减小到1.5μm,并且分布比较均匀,细致均匀的微观结构有利于试样电位梯度和大电流冲击下电学性能的提高。
柯磊, 蒋冬梅, 马学鸣
doaj  

[Progress in preparation and application of sodium alginate microspheres]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2023
Liu X, Wang Y, Liang Z, Lian X, Huang D, Hu Y, Wei Y.   +6 more
europepmc   +1 more source

高压开关用碟簧液压机构活塞杆激光熔覆工艺研究

Gaoya dianqi
为提高35CrMo基活塞杆关键部位的耐磨性，防止电镀工艺带来的镀层剥落失效问题。采用激光熔覆技术在35CrMo钢基材上制备不同工艺参数的20%WC/Ni基复合涂层，利用SEM、EDS、维氏硬度计和HRS-2M往复式摩擦磨损测试仪，研究了熔覆层的宏观形貌、微观形貌、显微硬度和耐磨性，最后采用激光熔覆最优工艺参数制备活塞杆并开展10 000次机械寿命试验。激光能量密度为63.3 J/mm2能够提高熔覆层组织均匀性、降低晶粒尺寸和提高熔覆层硬度；熔覆层组织越均匀、晶粒越细小有利于硬度、摩擦磨损等性能的提高 ...
张晓敏, 司晓闯, 舒明泽, 李凯, 苗晓军, 韩丽娟, 范艳艳, 牛溪野, 何流流   +8 more
doaj  

[Effect of porous surface structure on fatigue strength of 3D printed zirconia]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Zhao J, Ding Q, Li W, Ma Q, Lan Y, Zhang L, Han J.   +6 more
europepmc   +1 more source

An investigation of the microstructure and mechanical properties of dental zirconia manufactured by digital light processing 3D printing. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi, 2021
Mei ZY, Lu YQ, Lou YX, Zhang JJ, Sun ML, Yu HY.   +5 more
europepmc   +1 more source

[Bioactive substances delivery for bone repair via nanocomposites: advantages, mechanisms, and emerging trends]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Ma Y, Du Z, Wang J, Li X.
europepmc   +1 more source

[Effect of slurry proportion on the microstructure and properties of dental lithium disilicate ceramics manufactured through 3D printing]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Lin B, Chen X, Li R, Wan Q, Pei X.
europepmc   +1 more source

[Applications of ordered porous materials in chromatography separation and analysis]. [PDF]

Se Pu
Wang ZX, Wang DD, Wang ST, Song YY.
europepmc   +1 more source

Hierarchical evolution of bone biomimicry and osteo-coagulo-immunomodulation induced by the size of biological hydroxyapatite. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Xu J, Zhao Y, Liu H, Yin J, Chen Z.
europepmc   +1 more source