Journal ArticleDOI
Solid state SiC/Ni alloy reaction
Reads0
Chats0
TLDR
The solid state reaction between silicon carbide and a model superalloy consisting of 70 at.pct Ni, 20 at. pct Cr, and 10 at pct Al was studied between 700 °C and 1150 °C for times ranging from “0” hours to 330 hours as discussed by the authors.Abstract:
The solid state reaction between silicon carbide and a model superalloy consisting of 70 at. pct Ni, 20 at. pct Cr, and 10 at. pct Al was studied between 700 °C and 1150 °C for times ranging from “0” hours to 330 hours. Reaction couples consisting of SiC/Ni, SiC/Cr, and SiC/NiCr were also studied. The reactions were carried out in air with the materials, in the shape of discs, maintained in contact under a pressure of 7 MPa. A reaction was detected with SiC and the model alloy at all temperatures studied, and the reaction was diffusion controlled with an activation energy of 184 kJ/mole. In the ceramic the reaction was dominated by the diffusion of Ni into the ceramic forming a banded structure consisting of alternating layers of δ-Ni2Si and a two phase mixture of graphite and δ. On the metal side, the reaction was very dependent on the presence of alloying elements, with pure Ni reacting to the greatest extent, followed by the binary NiCr alloy, and finally by NiCrAl. The growth and presence of the phases detected in these reactions is consistent with phase equilibria concepts.read more
Citations
More filters
Journal ArticleDOI
Wettability and interfacial energies in SiC-liquid metal systems
TL;DR: In this paper, the sessile drop technique is used to measure the contact angles of molten Si, Sn, Cu and Ni in contact with mono- and polycrystalline α-SiC as well as CVD β -SiC in purified argon atmosphere and at various temperatures.
Journal ArticleDOI
Diffusion bonding of ceramics
TL;DR: In this article, the effects of operational variables on joint strength are discussed, including principal bonding parameters such as temperature, time and pressure, and the influence of atmosphere, mismatch in coefficient of thermal expansion between the joint members, interlayers and surface structure.
Journal ArticleDOI
Reactions between α‐Silicon Carbide Ceramic and Nickel or Iron
TL;DR: In this article, the interactions of very pure and practically 100% dense α-SiC with nickel and iron at 850°C were investigated by means of marker experiments, the diffusion mechanisms were investigated: only Ni and Fe migrate through the reaction layer.
Journal ArticleDOI
Solid state reactions of SiC with Co, Ni, and Pt
T.C. Chou,A. Joshi,J. Wadsworth +2 more
TL;DR: In this article, solid state reactions between SiC ceramics and Co, Ni, and Pt metals have been studied at temperatures between 800 and 1200 °C for various times under He or vacuum conditions.
Journal ArticleDOI
Further insight into mechanisms of solid-state interactions in UMo/Al system
TL;DR: In this article, the solid-state interactions between metastable γ-UMo alloys (containing 5, 7 and 10%Mo) and Al, at temperatures ranging from 440 to 600°C and for ageing times up to 10h, are studied using the diffusion couple technique and nuclear fuel plate annealing.
References
More filters
BookDOI
Introduction to analytical electron microscopy
TL;DR: Chpater et al. as discussed by the authors proposed the Monte Carlo Simulation in Analytical Electron Microscopy (Monte Carlo Simulation) for X-Ray Microanalysis (X-ray microscopy).
BookDOI
Ceramics for High-Performance Applications III
TL;DR: Fifty-eight papers were presented at the meeting and a separate abstract was prepared for each of 51 papers, with one paper appeared previously in ERA.