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Reaction moulding of metal and ceramic powders
Author(s) -
Birkinshaw C.,
Buggy M.,
O'Neill A.
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199605)66:1<19::aid-jctb458>3.0.co;2-l
Subject(s) - materials science , ceramic , depolymerization , polymerization , thermogravimetry , thermal stability , silicon nitride , monomer , volume fraction , viscosity , composite material , softening point , rheology , metal , fabrication , chemical engineering , silicon , polymer chemistry , polymer , metallurgy , medicine , alternative medicine , pathology , engineering
A processing route for fabrication of products from hard metal and ceramic powders is described in which a reactive monomer such as ethylcyanoacrylate is used as carrier and binder with the opportunity of recovery through thermal depolymerization. A feasibility study has examined some of the main technical points including monomer–powder reactivity and rheology, debinding rates and compact green density. The stability of ethylcyanoacrylate with various powder volume fractions of silicon nitride and 316L stainless steel has been examined, with p ‐toluenesulphonic acid used as polymerization inhibitor, and it was found that mixes with higher powder volume fractions required higher levels of inhibitor. Assessment of the flow behaviour of several of the compositions showed them to be significantly non‐Newtonian and the high viscosity of blends with a high loading of stainless steel suggests some premature polymerization. Measurement of green density of polymerized compacts demonstrated that high packing efficiency could be achieved. Thermogravimetry showed that rates of binder loss depended upon sample size and powder thermal conductivity.