Braze for silicon carbide bodies

Details Braze for silicon carbide bodies Braze for silicon carbide bodies

1993-11-08

1995-09-05

Simmons, David A.

Alloys or metallic compositions

Ferrous

Two percent or more silicon containing

420424, 420428, 420436, 420580, 420583, 420588, 420578, 148423, 148425, 148442, 228121, 2282629, 219 8513, C22C 3710, C22C 3834

Patent

active

054476836

ABSTRACT:
Dense monolithic SiC or SiC ceramic composites are strongly bonded using brazing compositions which, in their preferred composition, include a braze alloy consisting essentially of less than 50 weight percent silicon and at least two metals from the group of Fe, Cr, Co and V and produce a joint suitable for use in a high neutron flux environment. Brazing is carried out at a temperature of about 1200.degree. to 1500.degree. C. in an inert atmosphere and is complete in about 15 minutes. Broadly, a genus of brazing compounds are disclosed which include between about 10 and about 45 weight percent silicon and at least two elements selected from the following group: Li, Be, B, Na, Mg, P, Sc, Ti, V, Cr, Mn, Fe, Co, Zn, Ga, Ge, As, Rb, Y, Sb, Te, Cs, Pr, Nd, Ta, W and Tl.

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Loehman and Tomsia, "Joining of Ceramics," Ceramic Bulletin 67:375-380 (1988).
McDermid and Drew, "Thermodynamic Brazing Alloy Design for Joining Silicon Carbide," J. Am. Soc. 74:1855-1860 (1991).
Rabin, B., "Joining of Silicon Carbide/Silicon Carbide Composites and Dense Silicon Carbide Using Combustion Reactions in the Titanium-Carbon-Nickel System," J. Am. Cer. Soc. 75:131-135 (1992) (no month available).

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