Title: Chemical Vapor Deposition/Infiltration of Hafnium Diboride on Carbon Fiber with a Pyrolytic Carbon Interfacial Coating

Authors: Seth Shuster , Joseph Valus , Nathaniel Nisly , Kaveendra Yasas Wickramathilaka , Ryan Purgay , Fayaz Arif , Scott Bamonte Seth March , Kenneth Petroski , Akshay Waghray , Steven Suib L.

DOI: 10.33599/nasampe/s.24.0128

Abstract: Hafnium diboride is an ultra-high temperature ceramic with impressive thermal, mechanical, and electrical properties. It finds use in many high temperature aerospace applications. [1] Current methodologies for its synthesis utilize sintering techniques which require high temperatures, and can damage additional composite components. [2-3] Chemical vapor deposition/infiltration utilizes lower temperatures and offers wide degree of control of coatings by altering variables such as temperature, pressure, and gas flow ratios. [4-5] In this paper hafnium diboride was deposited on T-300 carbon fiber tows with pyrolytic carbon interfacial coatings, utilizing precursors consisting of HfCl4, H2, BCl3, and Ar. In this study all trials exhibited strong deposition rates which were as high as 35.4 μm/ hour, and impressive infiltration capabilities. Variables such as pressure and excess H2 amounts were changed, where temperature was kept consistent at 1250 °C. It was found that pressure affected deposition and morphologies rates and infiltration capabilities less than the ratios of excess H2.

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Conference: SAMPE 2024

Publication Date: 2024/05/20

SKU: TP24-0000000128

Pages: 16

Price: $32.00