Joining of Ultra High Temperature Ceramics using Reactive Metal Melts

2014 Fiscal Year Final Research Report

• Project/Area Number: 24686085
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Metal making engineering
• Research Institution: Kyushu University
• Principal Investigator: SAITO Noritaka 九州大学, 工学(系)研究科(研究院), 准教授 (80432855)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 超高温セラミックス / 接合 / 金属融体 / 濡れ性 / 界面反応 / 曲げ強度

Outline of Final Research Achievements

Joint-region microstructural characterization revealed well-bonded interfaces with microstructures strongly dependent on the interlayer. It was found that the Ti interlayer exhibited more intensive interfacial reaction with ZrB2 composite than the Zr interlayer, which is mainly attributed to the formation of Ti-Zr-Si ternary liquid phase at the bonding temperature. Additionally, the bending strength at room temperature reached 477.7±88 MPa for the Ti interlayer and 439±70 MPa for the Zr interlayer, respectively. Then at high temperature (1000 °C, under air), the bending strength exhibited 495.3±45 MPa for the Ti interlayer and 190.7±84 MPa for the Zr interlayer, respectively. These results indicated that the strength of the joints were comparable at room temperature, however at elevated temperature, the joint with Zr interlayer revealed significantly reduced strength, which is due to the residual metallic Zr at the interface and its oxidization during the bending test at 1000 °C.

Free Research Field

融体物理化学