Additive Manufacturing of Structural Non-oxide Ceramics by Photothermochemically-assisted Reaction Bonding
Abstract
Additive Manufacturing (AM) has become a highly valuable technique for rapid prototyping and for manufacturing of complicated parts that cannot be produced easily otherwise. To date, most AM implementations have focused primarily on metal and polymer materials, but non-oxide ceramics (including carbides, nitrides, borides, silicide s) are an important class of materials with many applications that could benefit from the use of AM methods. Non-oxide ceramics present unique technical issues that must be addressed for successful AM> Chemical bonds in most non-oxide ceramics are highly covalent and atomic diffusion below decomposition temperatures are limited. Also, high thermal stresses can be generated during processing owing to the extreme temperature gradients that can exist. While we will exploit aspects of existing metallic AM processing, ceramic AM cannot be effective achieved using high power laser techniques with typical feedstock currently being used (such as ceramic powders) since resulting structures are highly porous and significant post-consolidation processing is required to decrease porosity and increase structural strength, Also, the overarching hypothesis for the proposed program is that deposition of precursor feedstock s can be performed using established additive manufacturing techniques in controlled atmospheres and that these precursors can be photothermochemically converted into ceramics (especially carbides, nitrides and borides) using laser excitation to yield dense materials with useful mechanical and chemical properties.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141612460
Entities
People
- James B. Spicer
Organizations
- Johns Hopkins University
- Office of Naval Research
- United States Navy