Diffusion bonding of silicon nitride to austenitic stainless steel with metallic interlayers

Journal Article · Sun Jan 01 00:00:00 EST 1995 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02669806· OSTI ID:6610039

Stoop, B T.J.; Ouden, G den ^[1]

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1. Delft Univ. (Netherlands). Dept. of Materials Science and Engineering

This article deals with the diffusion bonding of hot-pressed silicon nitride (HPSN) to austenitic stainless steel using metallic interlayers. Experiments were carried out with Fe, Ni, invar, and kovar as the interlayer material. The best results were obtained with invar interlayers. Using these interlayers, joints having an average shear strength of 95 MPa were produced. The reaction layer formed at the ceramic-interlayer interface during the diffusion-bonding process consists of a porous zone anchored in the silicon nitride and a diffusion zone extending in the interlayer. No silicides were detected. The formation of the joint is governed by the decomposition of the silicon nitride. The free silicon generated by the decomposition reaction diffuses into the interlayer, whereas part of the free nitrogen disappears to the surface, the remainder being trapped in the form of pores. The mechanical strength of the joint depends strongly on the residual stress generated in the joint during cooling from diffusion-bonding temperature to room temperature due to the difference in thermal shrinkage between the ceramic and the metal. The residual stress level is directly related to the thickness of the reaction layer.

• OSTI ID: 6610039
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 26:1; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
JOINTS
MECHANICAL PROPERTIES
SILICON NITRIDES
BONDING
STAINLESS STEEL-316
EXPERIMENTAL DATA
IRON
NICKEL
SHEAR PROPERTIES
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
DATA
ELEMENTS
FABRICATION
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
METALS
MOLYBDENUM ALLOYS
NICKEL A
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
PNICTIDES
SILICON COMPOUNDS
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication