| 摘要 |
The invention provides a composition that significantly shortens the time necessary to produce a ceramic shell mold. The composition of the invention is used to produce a shell-mold for the investment casting process, providing decreased processing times by reducing the number of shell dips, and better handling and dewaxing through increased green strength. The invention provid es a method of forming a shell mold, comprising providing an investment casting shell-mold composition comprising 0.1 to 70 percent by weight inorganic fibe rs providing a disposable pattern, applying said composition to said pattern to form a binder coated pattern, applying refractory flour to said binder coate d pattern to form a binder and flour pattern coating, the improvement wherein said binder composition comprises. The invention provides in a method of forming a shell mold, comprising providing an investment castign shell-mold composition comprising a binder composition comprising a mixture of 20-98 percent by weight of a colloidal sol comprising inorganic particles, 1-20 percent by weight organic polymer; providing a disposable pattern, applying said composition to said pattern to form a binder coated pattern, applying refractory flour to said binder coated pattern to form a binder and flour pattern coating, the improvement wherein the binder composition comprises 0. 1 to 70 percent by weight of inorganic fibers.
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