Tribological Behavior of Advanced Base Oil and Grease for Space Applications

航天应用先进基础油和润滑脂的摩擦学行为

基本信息

批准号：
18560138
负责人：
OHNO Nobuyoshi
金额：
$ 2.48万
依托单位：
Saga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560138/
关键词：
Lubrication Space Lubricants EHL Rolling Element Bearing Fatigue Life MAC 815Z PFPE

项目摘要

Bearing Fatigue Life Tests in Advanced Base Oil and Grease for Space Applications1. The results of L_<10> life tests showed a long life in order of grease 601EF with base oil 815Z, base oil 2001A, grease R2000 with base oil 2001A and base oil 815Z.2. In the case of oil 815Z, bearing life is hardly related to film parameter A, in contrast to mineral oils, which show a general feature that bearing life increases with increasing A.3. Oil 815Z, having the acetal group (-OCF_2O-), at high shear rate in EHL conjunction the decomposition of oil molecule occurred by mechanical shear and hydrogen fluoride is occurred with the decomposition of acetal group. As a result, the permanent viscosity loss at high Hertzian pressure and hydrogen fluoride generation made shorten bearing life of 815Z oil.4. In the case of grease 601EF with base oil 815Z, thus viscosity loss doesn't occur in ball bearings and lengthen bearings life.5. Under the same A condition, grease 601EF, oil 2001A and grease R2000 with the lower friction coefficient under boundary lubrication has the longer life than paraffinic mineral base oil.Viscosity Loss in PFPE Lubricant for Space Applications under EHL conditions1. The viscosity loss occurred in 815Z fluid under EHL conditions. Permanent viscosity loss and temporary viscosity loss are observed.2. Permanent viscosity loss of 815Z fluid occurred rapidly with time at mean contact pressure of 1.95 GPa to 2.67 GPa. When mean contact pressure decreased, degree of viscosity loss decreased gradually.3. The fluid contains acetal group (-OCF_2O-), which the cause of permanent viscosity loss by decomposition of molecule under the high-pressure conditions.4. Viscosity loss increases with the change of phase from liquid to elastic-plastic solid.5. In the inlet region of EHL test, 815Z fluid showed temporary viscosity loss with lower film thickness.

航天应用高级基础油和润滑脂的轴承疲劳寿命测试1。 L_<10>寿命试验结果显示，润滑脂601EF加815Z基础油、基础油2001A、润滑脂R2000加2001A基础油、基础油815Z.2的寿命长。与矿物油相比，815Z 油的轴承寿命与油膜参数 A 几乎没有关系，这表明轴承寿命随着 A.3 的增加而增加。油815Z，具有缩醛基团(-OCF_2O-)，在EHL结合的高剪切速率下，通过机械剪切发生油分子的分解，并随着缩醛基团的分解而发生氟化氢。结果，高赫兹压力下的永久粘度损失和氟化氢的产生，使815Z油的轴承寿命缩短。 4．当润滑脂601EF配以815Z基础油时，球轴承不会出现粘度损失，延长了轴承的使用寿命。 5．在相同A条件下，边界润滑下摩擦系数较低的润滑脂601EF、油2001A和润滑脂R2000比石蜡矿物基础油具有更长的寿命。EHL条件下空间应用PFPE润滑剂的粘度损失1。 815Z 油液在 EHL 条件下发生粘度损失。观察到永久粘度损失和暂时粘度损失。2．在 1.95 GPa 至 2.67 GPa 的平均接触压力下，815Z 流体随着时间的推移会迅速发生永久性粘度损失。当平均接触压力减小时，粘度损失程度逐渐减小。 3．流体中含有缩醛基团（-OCF_2O-），在高压条件下会因分子分解而导致永久性粘度损失。 4．粘度损失随着从液体到弹塑性固体的相变而增加。5．在EHL测试的入口区域，815Z流体表现出暂时的粘度损失，且膜厚度较低。