High Performance Ir-Re Composite.
Abstract
A novel low temperature chemical vapor deposition (CVD) process has been developed for the co-deposition of Ir and Re. The codeposit was dense and consisted of both Re and Ir with crystallites ranging from 30 A and 1000 A in size. A reactive vapor phase was formed between 205 deg C and 220 deg C, and deposition was carried out onto quartz, graphite and rhenium substrates at between 410 deg C and 425 deg C. Changes to the processing parameters resulted in an increase in the deposition rate up to 0.8 mil/hour. Various Ir: Re ratios were investigated and compositions between 90%Ir-10%Re and 95%Ir-5%Re were identified as showing the best oxidation resistance at 2000 deg C. Application of a 90%Ir-10%Re coating was carried out onto the inside surface of a rhenium matrix, carbon fiber reinforced 25lbf thruster. Densification of the thruster took 51 hours in total and resulted in a composite with 33.9% open porosity. This low temperature CVD technique is generic in its approach and can be applied to deposit a wide range of nano-crystalline metal coatings.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1996
- Accession Number
- ADB212769
Entities
People
- Shanjin He