会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 1. 发明授权
    • Method of manufacture of single phase ceramic superconductors
    • 单相陶瓷超导体的制造方法
    • US5401712A
    • 1995-03-28
    • US947324
    • 1992-09-18
    • Jitrenda P. SinghRoger B. PoeppelKenneth C. GorettaNan Chen
    • Jitrenda P. SinghRoger B. PoeppelKenneth C. GorettaNan Chen
    • H01L39/24H01B12/00H01L39/12
    • H01L39/2464Y10S505/742Y10S505/782
    • A ceramic superconductor is produced by close control of oxygen partial pressure during sintering of the material. The resulting microstructure of YBa.sub.2 Cu.sub.3 O.sub.x indicates that sintering kinetics are enhanced at reduced p(O.sub.2) and that because of second phase precipitates, grain growth is prevented. The density of specimens sintered at 910.degree. C. increased from 79 to 94% theoretical when p(O.sub.2) was decreased from 0.1 to 0.0001 MPa. The increase in density with decrease in p(O.sub.2) derives from enhanced sintering kinetics, due to increased defect concentration and decreased activation energy of the rate-controlling species undergoing diffusion. Sintering at 910.degree. C resulted in a fine-grain microstructure, with an average grain size of about 4 .mu.m. Post sintering annealing in a region of stability for the desired phase converts the second phases and limits grain growth. The method of pinning grain boundaries by small scale decompositive products and then annealing to convert its product to the desired phase can be used for other complex asides. Such a microstructure results in reduced microcracking, strengths as high as 230 MPa and high critical current density capacity.
    • 陶瓷超导体是通过在材料烧结过程中紧密控制氧分压而产生的。 所得到的YBa2Cu3Ox微观结构表明烧结动力学在降低的p(O 2)下得到提高,而由于第二相析出,可以防止晶粒生长。 当p(O2)从0.1降低到0.0001 MPa时,在910℃下烧结的样品的密度从理论上从79增加到94%。 由于增加的缺陷浓度和速率控制物质经历扩散的活化能降低,p(O 2)的密度增加来自增强的烧结动力学。 在910℃烧结得到细晶粒微观结构,平均粒径约4μm。 在所需相的稳定区域中的后烧结退火转变第二相并限制晶粒生长。 通过小规模分解产物固定晶界的方法,然后退火以将其产物转化成所需相,可用于其它复合物。 这种微观结构导致微裂纹减少,强度高达230MPa和高临界电流密度容量。