Method and apparatus for inhibiting infiltration of a reactive gas into porous refractory insulation
AssigneeGoodrich Corporation
InventorJames Warren Rudolph
Life of this patent
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Abstract
The invention is relates to CVI/CVD furnace apparatus. More specifically, the invention is directed to methods and apparatus for inhibiting infiltration of reactive gas into insulation for a high temperature CVI/CVD furnace. A method and apparatus is provided that inhibits infiltration of reactant gas into porous insulation over extended periods of time, preferably the life of the furnace.
Claims9
A method of inhibiting infiltration of a reactive gas into porous refractory thermal insulation during high temperature processing of refractory composites, comprising the step of:
- sealing porous refractory insulation that may be exposed to a reactive gas during high temperature processing of refractory composites with a coating sufficiently impervious to said reactive gas to block penetration of said reactive gas into said porous refractory insulation, said coating comprising a first component that is absorbed into and bonds to said porous refractory insulation, and a second component overlying said first component that forms an impervious barrier to said reactive gas.
A method of inhibiting infiltration of a reactive gas into porous refractory thermal insulation during high temperature processing of refractory composites, comprising the step of:
- sealing a susceptor lid to a susceptor within a furnace with a compliant gasket impervious to reactive gas during said CVI/CVD or heat treatment process.
A method of inhibiting infiltration of a reactive gas into porous refractory thermal insulation during high temperature processing of refractory composites, comprising the step of:
- sealing a susceptor lid to a susceptor within a furnace with a braided gasket impervious to reactive gas during high temperature processing of refractory composites.
A method of insulating an induction coil for a furnace configured to process refractory composites, the induction coil having a cylindrical inside surface, comprising the step of:
- disposing a porous refractory thermal insulation adjacent said inside surface of said cylindrical induction coil for said furnace configured to process refractory composites, said porous refractory thermal insulation being sealed with a coating sufficiently impervious to reactive gas to block penetration of said reactive gas into said porous refractory thermal insulation, said coating comprising a first component that is absorbed into and bonds to said porous refractory insulation, and a second comnponent overlying said first component that forms an impervious barrier to said reactive gas.
A method of insulating an induction coil for a furnace configured to process refractory composites, the induction coil having a cylindrical inside surface to be insulated, comprising the step of:
- covering said cylindrical inside surface of said induction coil for said furnace configured to process refractory composites with a first compressible layer;
- covering said first compressible layer with a rigid refractory thermal insulation;
- covering said rigid refractory thermal insulation with an impervious layer on a side opposite said first comprehensible layer;
- and,
- disposing a cylindrical susceptor immediately adjacent said impervious layer.
A method of alleviating stresses due to differences in thermal expansion and contraction in an induction coil and a cylindrical rigid thermal insulation wall within a furnace configured to process refractory composites of the type wherein said induction coil defines a cylindrical inside surface disposed around said cylindrical rigid thermal refractory insulation, comprising the step of:
- forming a smooth surface on said cylindrical rigid refractory insulation wall adjacent said cylindrical inside surface.
A method of alleviating stresses due to differences in thermal expansion and contraction in a cylindrical rigid thermal insulation wall and a susceptor within a furnace configured to process refractory composites of the type wherein said cylindrical rigid refractory insulation is disposed around a cylindrical outside surface of said susceptor, comprising the step of:
- forming smooth surfaces on said cylindrical outside surface and said cylindrical rigid refractory insulation wall adjacent said cylindrical outside surface.
Dependencies are inferred from the claim text.