Effect of Heat Treatment on Silicon Carbide Based Joining Materials for Fusion Energy

Book · Mon Oct 01 04:00:00 EDT 2001

OSTI ID:984273

Lewinsohn, Charles A; Jones, Russell H; Nozawa, T; Kotani, M; Kishimoto, H; Katoh, Y; Kohyama, A

Two general approaches to obtaining silicon carbide-based joint materials were used. The first method relies on reactions between silicon and carbon to form silicon carbide, or to bond silicon carbide powders together. The second method consists of pyrolysing a polycarbosilane polymer to yield an amorphous, covalently bonded material. In order to assess the long-term durability of the joint materials, various heat treatments were performed and the effects on the mechanical properties of the joints were measured. Although the joints derived from the polycarbosilane polymer were not the strongest, the value of strength measured was not affected by heat treatment. On the other hand, the value of the strength of the reaction-based joints was affected by heat treatment, indicating the presence of residual stresses or unreacted material subsequent to processing. Further investigation of reaction-based joining should consist of detailed microscopic studies; however, continued study of joints derived from polymers is also warranted.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 984273
• Report Number(s): PNNL-SA-31892; AT6020100
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CARBON
HEAT TREATMENTS
MATERIALS
MECHANICAL PROPERTIES
POLYMERS
PROCESSING
RESIDUAL STRESSES
SILICON
SILICON CARBIDES
THERMONUCLEAR REACTORS