Bulk paint and ceramic powder systems, methods of forming same, and methods of forming a flexible ceramic coating on a metal substrate are disclosed. The systems may include a ceramic composition having between 2 to 30 weight percent of an alkali metal oxide, such as K.sub.2O, Na.sub.2O, and Li.sub.2O or mixtures thereof, between 10 to 74 weight percent SiO.sub.2, and between 23 to 79 weight percent B.sub.2O.sub.3. Additives that are nonwetting with molten metals, such as boron nitride, provide durable coatings for metal processing operations. The ceramic composition may include less than 5 weight percent additional metal oxides. The bulk paint system further may include water and a cellulosic suspension agent to form a bulk paint. The ceramic powder system may be processed to form a uniform powder. The bulk paint or uniform powder may be applied to a metal substrate, such as a ferrous metal substrate, dried, and heated to form a flexible coating on the metal substrate.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the glass contains silicon, boron, and magnesium.

A method of manufacturing a tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention, the tubular member including a tubular main body made of a metal and an insulating layer formed on at least an inner peripheral surface of the tubular main body, the insulating layer containing glass, includes steps of: forming a coating film by spraying a coating liquid for insulating layer formation onto the inner peripheral surface of the tubular main body; and firing the coating film to obtain the insulating layer. The spraying is performed while the tubular main body is rotated with a length direction thereof being a rotation axis.

Disclosed are barrier coatings for fused silica components used in semiconductor processing. In particular, the present disclosure concerns protective substrate-barrier coatings composed of corrosion-resilient metal compounds which provide superior resistance to erosion/corrosion when a coated substrate is subjected to the acidic environments at elevated temperatures typical for semiconductor processing.

A method for producing a metal powder provided on the surface thereof with a glassy thin film, wherein a glassy substance is produced in the vicinity of the surface of the metal powder by spray pyrolysis from a solution that contains a thermally decomposable metal compound and a glass precursor that produces a glassy substance that does not form a solid solution with the metal produced from the metal compound by thermal decomposition, so as to form the metal powder provided on the surface thereof with the glassy thin film. The glass precursor is prepared such that the melting temperature Tm.sub.M of the metal and the liquid phase temperature Tm.sub.G of the mixed oxide of the glassy substance satisfy the following formula (1):
−100 [° C.]≤(Tm.sub.M−Tm.sub.G)≤500 [° C.]  (1).

A method for producing a metal powder provided on the surface thereof with a glassy thin film, wherein a glassy substance is produced in the vicinity of the surface of the metal powder by spray pyrolysis from a solution that contains a thermally decomposable metal compound and a glass precursor that produces a glassy substance that does not form a solid solution with the metal produced from the metal compound by thermal decomposition, so as to form the metal powder provided on the surface thereof with the glassy thin film. The glass precursor is prepared such that the melting temperature Tm.sub.M of the metal and the liquid phase temperature Tm.sub.G of the mixed oxide of the glassy substance satisfy the following formula (1):
−100 [° C.]≤(Tm.sub.M−Tm.sub.G)≤500 [° C.]  (1).

The present disclosure provides systems and methods for in-line thermal flattening and enameling of steel sheets. The systems and methods include an in-line thermal flattening of a feed stock steel sheet and a subsequent enamel coating of the steel sheet. The resulting enamel coated steel sheet has improved flatness compared with other coated steel sheets that are enamel coated but do not undergo the in-line thermal flattening. The systems and methods allow the use of less expensive source materials without sacrificing quality in the finished enameled product.

The present disclosure provides systems and methods for in-line thermal flattening and enameling of steel sheets. The systems and methods include an in-line thermal flattening of a feed stock steel sheet and a subsequent enamel coating of the steel sheet. The resulting enamel coated steel sheet has improved flatness compared with other coated steel sheets that are enamel coated but do not undergo the in-line thermal flattening. The systems and methods allow the use of less expensive source materials without sacrificing quality in the finished enameled product.

A manufacturing process of a heat-resisting glass or enamel coating of a thermally insulated container chamber is described. The process comprises selecting a thermally insulated metal container body, and performing sand blasting to a chamber surface of the body such that the chamber surface becomes a rough surface. The process comprises spraying a glass or enamel glazing material on the rough surface of the body and drying the glazing material on the rough surface. The process comprises placing a dried body on a bracket and sintering the dried body. After sintering is performed, the process comprises removing the body from the bracket. Using this disclosure the chemical properties of the glass coating or enamel coating are relatively stable, so corrosion will not occur. Because the thermal expansion and cold contraction are relatively small, the coating is suitable for manufacturing thermally insulated containers such as thermally insulated cups.

A method of producing an enamel coating for a cylinder bore in a cylinder block of an internal combustion engine is provided. The method also provides for coating a cast iron gray cylinder block with an enamel coating.