Abstract
Many benefits can be realized by incorporating hydrostatic bearings into liquid hydrogen turbopumps; however, suitable material coatings must be used to avoid excessive wear during multiple starts and stops. Chemical vapor deposited (CVD) diamond coatings were developed and tested at Phillips Laboratory for use as liquid hydrogen rocket turbopump bearing surfaces. A short list of coating materials other than diamond is suggested. Nine manufacturers out of fifty contacted are identified as capable of depositing durablecoatings on Inconel 718. A cost effective low temperature tribometer based on the hydrostatic bearing application should be designed and built prior to performing full scale tests.
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