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METHODOLOGY Description of Apparatus To achieve the desired outcomes, various apparatus are required, namely for diffusion bonding and post‐bond heat treatment. Apparatus for Diffusion Bonding The apparatus for diffusion bonding is de‐ signed to provide compressive loading (pressing) and heating in a vacuum at the interface of a specimen to be joined. The configuration of the working part of the apparatus is shown at Fig. 3. Apparatus for Post‐Bond Heat Treatment This apparatus is designed to carry out post‐ bond heat treatment for further diffusion processes to takes place in the diffusion cou‐ ples obtained by diffusion bonding. A sche‐ matic drawing of the annealing furnace, vac‐ uum chamber, specimen and its mounting is shown in Fig. 5. MIMET Technical Bulletin Volume 1 (2) 2010 Materials and Specimen Preparation for Diffu‐ sion Bonding. Materials used in this study as parent metals are commercial grade aluminum and steel with various carbon contents. These materials are cut in a lathe to cylindrical specimen of sizes; 12 mm diameter by 10 mm length, and 14 mm diameter by 20 mm length for metallographic observation and tensile test specimens respec‐ tively. This specimen and their assembly are shown in Fig. 6 and Fig.7 respectively. 4.3 Bonding Procedure The specimens are positioned in the apparatus as shown in Fig. 3. The temperature used for the metallographic specimens is 600°C and for tensile specimen are 500°C, 550°C and 600°C. The bonding of these specimens is conducted under a dynamic vacuum pressure of the order of 10‐2 Torr for 30 minute with bonding pressure of 0.5 kgf/mm. | MARINE FRONTIER @ UniKL 71
Heat Treatment Procedure Specimens for metallographic observations, after diffusional bonded, are sectioned axially into two halves and each half is mounted in the apparatus for post‐bond heat treatment, as shown in Fig 5. MIMET Technical Bulletin Volume 1 (2) 2010 Metallographic Preparation and Examinations After diffusion heat treatment, the speci‐ mens are prepared for metallography. Photo‐ graphs of the prepared metallographic speci‐ mens, in the vicinity of diffusion zones, along the bonding interface are then taken by optical microscope. From the microphoto‐ graphs the microstructures of the diffusion zone are examined and the diffusion layer thickness measured directly. Electron probe analysis (EPMA) is also per‐ formed on some of these specimens to determine composition. | MARINE FRONTIER @ UniKL 72
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MIMET Technical Bulletin Volume 1 (
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