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23 条记录 (耗时 0.013 秒)

    Detecting defects by distribution of positron lifetimes in crystalline materials
    6.
    发明授权
    Detecting defects by distribution of positron lifetimes in crystalline materials 失效
    通过在结晶材料中分配POSITRON LIFETIMES来检测缺陷

    公开(公告)号：US3593025A

    公开(公告)日：1971-07-13

    申请号：US3593025D

    申请日：1968-06-14

    申请人： MIDWEST RESEARCH INST

    发明人： GROSSKREUTZ JOSEPH C

    IPC分类号： G01N23/203 ,  G01T1/30 ,  G01T1/20

    CPC分类号： G01N23/203 ,  G01T1/30

    摘要： A method of nondestructively testing a structural member of crystalline material employs positrons from a radioactive source as a probe to detect the presence of latent defects in the crystalline structure of the member, such as those due to early fatigue damage or microscopic porosity. The half-life of positrons is longer in materials containing such defects than in undamaged materials; therefore, a measurement of the time of existence of positrons in a given material is effected and serves as an indication as to whether the half-life of the positrons in the material under test is longer than normal.

    Polyphenylene sulfide bonded solid film lubricant
    9.
    发明授权
    Polyphenylene sulfide bonded solid film lubricant 失效
    聚苯硫醚粘结固体润滑剂

    公开(公告)号：US3878113A

    公开(公告)日：1975-04-15

    申请号：US34130373

    申请日：1973-03-14

    申请人： MIDWEST RESEARCH INST

    发明人： CAMPBELL MAHLON E ,  WALKER WILLIAM D

    IPC分类号： C10M169/00 ,  F16C33/20 ,  C10M7/40 ,  C10M7/02 ,  C10M7/06

    CPC分类号： C10M7/00 ,  C10M2201/041 ,  C10M2201/042 ,  C10M2201/05 ,  C10M2201/062 ,  C10M2201/066 ,  C10M2221/00 ,  C10M2221/02 ,  C10N2240/02 ,  C10N2250/04 ,  C10N2250/08 ,  C10N2250/10 ,  F16C33/201

    摘要： A relatively thick, solid film lubricant comprising a polyphenylene sulfide binder having a finely divided, solid phase lubricating material dispersed throughout the binder, wherein the polyphenylene sulfide polymer has a chain of from 6 to 12 recurring C6H4-S units in its initial state prior to curing. The lubricant layer is heat cured on the surface of a bearing substrate to advance the polymerization of the binder to an infusible state in which the binder is resistant to thermal degradation at useful temperatures in air on the order of 1000* F. The thickness of the layer may be from 0.001 to 0.01 inch without flaking under load.

    摘要翻译： 一种相对厚的固体膜润滑剂，其包含具有分散在整个粘合剂中的细分散的固相润滑材料的聚苯硫醚粘合剂，其中聚苯硫醚聚合物具有6-12个重复的C6H4-S单元的链，其初始状态为 养护。 润滑剂层在轴承基材的表面上被热固化，以使粘合剂的聚合促进粘合剂在1000°F左右的空气中的有用温度下耐热降解的不熔状态。 层可以是0.001至0.01英寸，而不会在负载下剥落。