Accession Number:

ADB205552

Title:

Out-of-Furnace Brazing Technology for Assembly of Large Carbon-Carbon Space Structures.

Descriptive Note:

Final rept. May-Nov 93,

Corporate Author:

FOSTER-MILLER INC WALTHAM MA

Personal Author(s):

Report Date:

1994-04-01

Pagination or Media Count:

52.0

Abstract:

In this Phase I SBIR program, Foster-Miller demonstrated the feasibility of an innovative joining technique for two-dimensional carboncarbon CC composite materials using active braze alloys. Traditionally, brazing of CC composites required use of high- temperature vacuum furnaces. Vacuum brazing required expensive capital equipment with a limited working area and brazing cycles on the order of several hours to more than a day. The Foster-Miller technique utilized a controlled atmosphere induction brazing to reduce the brazing times to minutes and increased the interlaminar strengths by using of the proprietary Foster-Miller z-pin reinforcement technique. The use of the out-of-furnace brazing concept combined with z-direction reinforcements showed strengths of up to 1550 psi compared to the vacuum furnace braze joint strengths of 1153 psi. The constituents of the purging gases as well as proprietary solid oxygen getters were adjusted to eliminate all oxygen while brazing, thus minimizing problems associated with oxidation. This program analyzed the advantages of the oxygen getters in addition to the effect of braze layer thicknesses on strengths of the brazed CC joints. The follow-on Phase II program will focus on transitioning the brazing technology to aerospace and terrestrial thermal management and structural applications of CC composites.

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE