National Space Development Agency of Japan Space Utilization Research Center
Ishikawajima Jet Service Co Ltd Space Department
Ishikawajima Jet Service Co Ltd Space Department
Ishikawajima-Harima Heavy Industries Co Ltd Space Experiment System Development Department
National Space Development Agency of Japan Space Utilization Research Center
National Space Development Agency of Japan Space Utilization Research Program
National Space Development Agency of Japan Space Utilization Research Program
出版者
宇宙開発事業団
出版者（英）
National Space Development Agency of Japan (NASDA)
The measurement experiment of self- and mutual-diffusion coefficients was planned in the flight of TR-1A-7 rocket to verify the Darken's relationship between them. The Ag-Cu alloys are suitable for the investigation because of easiness of sample handling due to low chemical reactivity. However, the Ag-Cu system has a solidification problem since the system is a eutectic alloy. The shear cell technique was investigated to avoid the problem. Described is an outline of the experimental preparations in terms of reactivity test of the alloy with a crucible material, vaporization characteristics of liquid Ag-Cu system and sample preparation. A shear cell was developed, which contains ten diffusion couples in one cartridge. A sample of 1.5 mm in diameter is pushed by a tungsten spring to cope with the volume change of the sample during the experiment. Boron nitride was chosen as a material for crucible because of its high contact angle and less reactivity with the alloy. Vaporization characteristic of the alloy was tested to prevent the sample to vaporize through the slight gap of the cell. The reduction of the sample weight was measured by the use of the thermogravimetric and differential thermal analyses. The maximum experimental temperature was determined to be 1,260 C from the analytical results. Prior to determining the sample preparation of Ag-Cu alloys, deoxidation procedure was examined. The sample made of deoxidized material had better surface than that made without deoxidation. Uniformity of concentration profile and longitudinal shrinkage of the diffusion sample were investigated to find a suitable way for preparing a sample. The change of the concentration profile during a diffusion experiment was calculated and the length of a diffusion sample was decided to be 10 mm.
Technical development for the liquid diffusion experiments on Ag-Cu alloys in the TR-1A No.7 rocket
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