phoenix.eng.psu.ac.thphoenix.eng.psu.ac.th/qa/Reference54/GradPaper/Pajaree.pdf · were intermixed...
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phoenix.eng.psu.ac.thphoenix.eng.psu.ac.th/qa/Reference54/GradPaper/Pajaree.pdf · were intermixed in a planetary ball mill (250 rpm) for 30 min and enclosed into the steel pipe,