| Summary: | 碩士 === 遠東科技大學 === 機械工程研究所 === 102 === Daily health care has been becoming an important topic for the general public that we can find more and more products allegedly of health care function with infrared radiation are appearing in the market. For commercial infrared thermotherapy devices currently available, the infrared radiation frequency in fertility wavelength needs to be improved. The used materials often contain heavy metals such as lead, chromium, cadmium, antimony, germanium and other metallic elements that may cause environmental pollutions. Moreover, the price is usually high. Therefore, we used the inexpensive natural cordierite as the substrate material and make improvements to this environmental friendly material which does not contain any heavy metal elements in hope of enhance the infrared property and decrease the manufacture costs in the meantime.
in this study, we used cordierite ceramics and infrared materials as the raw materials for research and manufacture of honeycomb infrared thermotherapy ceramics. Beginning with material selection, we investigated into the fundamental properties of the cordierites and then add different amount of infrared powders for synthesis. Subsequently the combination of materials is subject to mixing and kneading so to make the slurry of plasticity. After extrusion to be molded, shape-fixing under microwaves, and drying, the intermediate material is then sintered. Under condition of 60°C , the finished product is analyzed by FT-IR for its infrared properties. As demonstrated by the data, by addition of 20wt% infrared materials the infrared radiation rate can be as high as 0.978 for wavelength range from 5-13 μm.
By analyzing the mineral phase of cordierites, it has been confirmed and shown that the phase of cordierite ceramics becomes obviously directional after being sintered at 1,300°C. By addition of 20wt% infrared materials, cordierites can be sintered at 1,250°C to a structure of crystal phase being a potassium-hexagon cordierite. Based on the results, it can be inferred that the mineral structure of such potassium-hexagon cordierite has remarkable property of releasing infrared radiations at condition of 60°C.
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