The importance of zero gravity environment in the development and production of new and improved materials is considered along with the gravitational effects on phase changes or critical behavior in a variety of materials. Electronic property characterization of the superconducting transition temperatures were made using an impedance change-tuned coil method.įuture utilization of space: Silverton Conference on material science and phase transformations in zero-gravity, summary of proceeding The morphology was developed using optical and scanning electron microscopy and microprobe analyses. Materials systems studied were Ca-La, Cd-Ga and Al-Bi evaluation of the processed samples included the morphology and electronic property measurements. The design is included of drop tower apparatus to provide the electromagnetic and acoustic mixing equipment, and a thermal model was prepared to design the specimen and cooling procedure. The same process methods were applied during free fall on the MSFC drop tower facility. Under one- gravity, these included thermal processing, thermal plus electromagnetic mixing, and thermal plus acoustic mixing. Study on processing immiscible materials in zero gravityĪn experimental investigation was conducted to evaluate mixing immiscible metal combinations under several process conditions. Our results indicate that space processed immiscible materials may form an entirely new class of electronic materials. By measuring the electrical resistivity and superconducting critical temperature, Tc, of zero-g processed Ga-Bi samples, it has been found that the electrical properties of such materials are entirely different from the basic constituents and the ground control samples. However, when the immiscibles are dispersed and solidified in zero-gravity, density separation does not occur, and unique composite solids can be formed with many new and promising electrical properties. When dispersed or mixed immiscibles are solidified on earth, a large amount of separation of the constituents takes place due to differences in densities. The electrical properties of zero-gravity processed immiscibles
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