Methods for producing components for use in high temperature systems that include reacting a fluid reactant and a porous preform that has a pore volume and contains a solid oxide reactant that defines a solid volume of the porous preform. The method includes infiltrating the fluid reactant into the porous preform to react with the solid oxide reactant to produce a oxide/metal composite component, during which a displacing metal replaces a displaceable species of the solid oxide reactant to produce at least one solid oxide reaction product that has a reaction product volume that at least partially fills the pore volume. The oxide/metal composite component includes at least one oxide phase and at least one metal phase. The component is exposed to temperatures greater than 500 C. and the at least one oxide phase and the at least one metal phase exhibit thermal expansion values within 50% of one another.

Methods for producing components for use in high temperature systems that include reacting a fluid reactant and a porous preform that has a pore volume and contains a solid oxide reactant that defines a solid volume of the porous preform. The method includes infiltrating the fluid reactant into the porous preform to react with the solid oxide reactant to produce a oxide/metal composite component, during which a displacing metal replaces a displaceable species of the solid oxide reactant to produce at least one solid oxide reaction product that has a reaction product volume that at least partially fills the pore volume. The oxide/metal composite component includes at least one oxide phase and at least one metal phase. The component is exposed to temperatures greater than 500 C. and the at least one oxide phase and the at least one metal phase exhibit thermal expansion values within 50% of one another.

Precision glass molds are described, which are formed by coating a mold made from high purity, fme grain sized graphite, with a coating including titanium. In various implementations, the titanium coating is overcoated with yttria (Y.sub.2O.sub.3) to provide a high precision glass mold of superior performance character. The resultant glass molds can be used to form glass articles having a highly smooth finish, for high precision applications such as consumer electronic device applications, medical instruments, and optical devices. The use of high purity, fme grain size graphite allows molds to be machined at low cost, thereby eliminating the need to fabricate a metal mold that must be coated with multiple layers including metal diffusion barrier layers to meet operational requirements for such precision applications.

Precision glass molds are described, which are formed by coating a mold made from high purity, fme grain sized graphite, with a coating including titanium. In various implementations, the titanium coating is overcoated with yttria (Y.sub.2O.sub.3) to provide a high precision glass mold of superior performance character. The resultant glass molds can be used to form glass articles having a highly smooth finish, for high precision applications such as consumer electronic device applications, medical instruments, and optical devices. The use of high purity, fme grain size graphite allows molds to be machined at low cost, thereby eliminating the need to fabricate a metal mold that must be coated with multiple layers including metal diffusion barrier layers to meet operational requirements for such precision applications.

A method of metallizing a ceramic substrate includes depositing a barrier layer onto the substrate, depositing a tie layer onto the barrier layer, and depositing a metal layer onto the tie layer to metallize the substrate. The barrier layer may include an oxygen rich material, a nitrogen rich material, or a carbon rich material.

A coated tool according to the present disclosure is a coated tool including a base body and a coating film located on the base body. The coated tool has a first surface with a rake face, a second surface with a flank face, and a third surface located between the first surface and the second surface and being a C surface or an R surface. The coating film includes a first coating film located on the first surface and/or a second coating film located on the second surface, and a third coating film located on the third surface. When a wavenumber of a maximum Raman peak of the first coating film is referred to as a first wavenumber, a wavenumber of a maximum Raman peak of the second coating film is referred to as a second wavenumber, and a wavenumber of the maximum Raman peak of the third coating film is referred to as a third wavenumber, the third wavenumber is smaller than the first wavenumber and the second wavenumber.

A coated tool according to the present disclosure is a coated tool including a base body and a coating film located on the base body. The coated tool has a first surface with a rake face, a second surface with a flank face, and a third surface located between the first surface and the second surface and being a C surface or an R surface. The coating film includes a first coating film located on the first surface and/or a second coating film located on the second surface, and a third coating film located on the third surface. When a wavenumber of a maximum Raman peak of the first coating film is referred to as a first wavenumber, a wavenumber of a maximum Raman peak of the second coating film is referred to as a second wavenumber, and a wavenumber of the maximum Raman peak of the third coating film is referred to as a third wavenumber, the third wavenumber is smaller than the first wavenumber and the second wavenumber.

A fluid heating component including: a pillar-shaped member made of ceramics and formed with through channels through which a fluid passes, and a conductive coating layer disposed on at least a part of a circumferential surface of the pillar-shaped member, wherein the conductive coating layer is disposed on coats the whole circumference of a cut surface of the pillar-shaped member in a state where the conducive coating layer is electrically connected, in the cut surface of the pillar-shaped member which is perpendicular to a passing direction of the fluid.

A fluid heating component including: a pillar-shaped member made of ceramics and formed with through channels through which a fluid passes, and a conductive coating layer disposed on at least a part of a circumferential surface of the pillar-shaped member, wherein the conductive coating layer is disposed on coats the whole circumference of a cut surface of the pillar-shaped member in a state where the conducive coating layer is electrically connected, in the cut surface of the pillar-shaped member which is perpendicular to a passing direction of the fluid.

A method of protecting a carbon-containing composite material part against oxidation, includes applying a first coating composition in the form of an aqueous suspension on an outside surface of the part, the first coating composition including a metallic phosphate; a powder of an ingredient comprising titanium; and a powder of B.sub.4C; subjecting the applied first coating composition to heat treatment in order to obtain a first coating on the outside surface of the part; applying a second coating composition on the first coating composition, the second coating composition including an aqueous suspension of colloidal silica; a powder of borosilicate glass; and a powder of TiB.sub.2; and subjecting the applied second coating composition to second heat treatment in order to obtain a second coating on the first coating.