Full sintering of powdered-metal bodies in a microwave field

Rustum Roy, Dinesh Agrawal (), Jiping Cheng and Shalva Gedevanishvili
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Rustum Roy: Materials Research Laboratory, The Pennsylvania State University
Dinesh Agrawal: Materials Research Laboratory, The Pennsylvania State University
Jiping Cheng: Materials Research Laboratory, The Pennsylvania State University
Shalva Gedevanishvili: Materials Research Laboratory, The Pennsylvania State University

Nature, 1999, vol. 399, issue 6737, 668-670

Abstract: Abstract The use of microwaves to process absorbing materials was studied intensively in the 1970s and 1980s, and has now been applied to a wide variety of materials1,2,3,4. Initially, success in microwave heating and sintering was confined mainly to oxide and some non-oxide ceramics5,6,7,8,9,10,11; but recently the technique has been extended to carbide semimetals12,13,14 used in cutting tools. Here we describe the microwave sintering of powdered metals to full density. We are able to sinter a wide range of standard powdered metals from commercial sources using a 2.45-GHz microwave field, yielding dense products with better mechanical properties than those obtained by conventional heating. These findings are surprising in view of the reflectivity of bulk metals at microwave frequencies. The ability to sinter metals with microwaves should assist in the preparation of high-performance metal parts needed in many industries, for example, in the automotive industry.

Date: 1999
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DOI: 10.1038/21390

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