Binder system for ceramic arc discharge lamp

申请公布号：AU3973202(A)

申请号：AU20020039732

申请日期：2001.11.09

申请公布日期：2002.06.03

申请人：

GENERAL ELECTRIC COMPANY

发明人：DANIEL L. POLIS;DAVID DUDIK;VISHAL GAURI

分类号：B22F1/00;C04B35/634

主分类号：B22F1/00

摘要：A binder system for forming a ceramic body, such as a translucent arc tube for a metal halide lamp, comprises a hydrocarbon, such as a paraffin wax, a copolymer, such as poly (ethylene-co-vinyl acetate), and optionally a surfactant. The binder system is mixed with a ceramic powder and heated to above the melting point of the binder. The heated mixture is formed into a compact having the general shape of the finished ceramic body and then cooled or allowed to cool. The hydrocarbon and copolymer have overlapping freezing points so that when the shaped compact cools, crystalline segments of the copolymer (such as ethylene segments) co-crystallize with the hydrocarbon, while amorphous segments (such as vinyl acetate) form bridges between the crystalline regions. As a result, the cooled compact has improved green strength over conventional binder systems.

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