Chromium boride coated articles
Abstract
Abstract A MATERIAL HAVING AN OUTER LAYER OF CHROMIUM BORIDE FORMED ON AN INTERMEDIATE SUBLAYER OF ESSENTIALLY PURE CHROMIUM ON A SUBSTRATE. THE CHROMIUM LAYER AND THE DIFFUSION ZONE BETWEEN THE CHROMIUM AND SUBSTRATE SERVE AS A THERMAL EXPANSION MISMATCH ACCOMMODATION REGION TO MINIMIZE CRACKING OF THE CHROMIUM BORIDE LAYER. THE CHROMIUM LAYER SERVES AS A SECONDARY CORROSION BARRIER AT THE BASE OF MINOR CRACKS SOMETIMES FORMED IN THE OUTER CHROMIUM BORIDE LAYER. IN THE PREFERRED EMBODIMENTS WE PRODUCE A CRACK-FREE CHROMIUM BORIDE LAYER BY SELECTING A SUBSTRATE MATERIAL WHICH IS EXPANSION MATCHED THEREWITH. THE PRESENT MATERIALS HAVE PARTICULAR UTILITY ON TEMPERATURE SENSING DEVICES IN MOLTEN ALUMINUM.
Inventors
- 👤 Thyne R Van
- 👤 J Rausch
Bibliographic Details
Claims Analysis
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