USA As Represented by Secretary of the Navy

Eric J Wuchina

Inna G Talmy

James A Zaykoski

Mark M Opeka

A chemical vapor deposition process comprising reacting HfCl.sub.4 with Bsub.3 and SiCl.sub.4 with BCl.sub.3 on a surface heated at 1100.degree. C. to 1300.degree. C. in a vacuum to produce a two phase HfB.sub.2 -SiB.sub.4 ceramic coating on the surface, wherein the HfCl.sub.4, SiCl.sub.4, and BCl.sub.3 reactants are deposited onto the heated surface from a vapor phase, and wherein H.sub.2 is used to dissociate the HfCl.sub.4, SiCl.sub.4 and BCl.sub.3 molecules.

Process for preparing a two phase HFB.sub.2 -SIB.sub.4 material

A two phase HfB.sub.2 --SiB.sub.4 material which is useful as a high tempture oxidation resistant coating.

Two phase HfB.sub.2 -SiB.sub.4 material

A composite with a reinforcing material that is Al.sub.2 O.sub.3, SiC, or xtures thereof in a matrix that is a ceramic material based on a solid solution of CrB.sub.2 and NbB.sub.2.

CrB.sub.2 -NbB.sub.2 /Al.sub.2 0.sub.3 and CrB.sub.2 -NbB.sub.2 /SiC

Ceramic materials based on solid solutions of chromium diboride (CrB.sub.2) nd niobium diboride (NbB.sub.2).

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Wheaton, MD, United States of America

Eric J Wuchina