Thermal shock resistant ceramic article
AssigneeVesuvius Crucible Company
InventorEric Hanse
Life of this patent
Estimating the term…
Abstract
A thermal shock-resistant ceramic article and a method of manufacturing the article include alternating layers of a first material (2) comprising a fusible, particulate ceramic composition and a second material (3), typically comprising a porous, pyrolyzable material. The layered structure increases the article's work of fracture and toughness, and may lead to improved thermal shock-resistance. The method advantageously uses a sheet, film or sleeve to prepare the article for firing. The composition, thickness, and porosity of the second material (3) will affect the desired properties. The method is particularly adapted for manufacturing cylindrical articles, including stopper rods, nozzles, and pouring tubes for the metal casting industry.
Claims21
A method for producing a multi-layer article, comprising:
- a) laying down a sheet having a thickness between about 0.005 mm and about 2.0 mm;
- b) depositing onto the sheet a fusible, particulate ceramic composition at a thickness between about 0.05 mm and about 20 mm, thereby producing a layer;
- c) depositing at least one additional layer;
- d) pressing the layers to form a piece;
- and
- e) firing the piece at a temperature sufficient to fuse the ceramic composition.
A method for producing an article for use with molten metal, comprising:
- a) laying down a sheet having a thickness between about 0.005 mm and about 1 mm;
- b) depositing onto the sheet a fusible, particulate ceramic composition to a thickness of between about 0.05 and about 10 mm;
- c) compacting the ceramic composition;
- d) rolling up the sheet and the ceramic composition about a center point until a desired thickness is achieved, whereby the first layer and the second layer spiral outward from the center point;
- e) pressing the layers to form a piece;
- and
- f) firing the piece at a temperature sufficient to fuse the ceramic composition.
A method for producing an article for use with molten metal, comprising:
- a) filling a flexible sleeve with a fusible, particulate ceramic composition;
- b) compacting the filled sleeve;
- c) layering a plurality of compacted sleeves to form a piece;
- d) pressing the piece;
- and
- e) firing the piece at a temperature sufficient tofuse the ceramic composition.
21 A method for producing an article for use with molten metal, comprising:
- a) filling a flexible, porous sleeve with a fusible, particulate ceramic composition;
- b) compacting the filled sleeve;
- c) wrapping the filled sleeve around a mandrel to form a piece;
- d) isostatically pressing the piece;
- and
- e) firing the piece at a temperature sufficient to fuse the ceramic composition.
Dependencies are inferred from the claim text.