Refractory Joint Reinforcement with Metal Mesh
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Solution Overview
Problem
Existing methods for forming sealed joints in molten metal containment vessels, particularly those made of refractory or ceramic materials, deteriorate over time due to thermal cycling, leading to leakage issues, especially when heated.
Innovation Solution
A method involving a mesh body of metal wires resistant to molten metal, positioned between refractory sections, covered with a moldable refractory material to form a reinforced seal, which provides a flexible support and creates a tortuous path for molten metal penetration, preventing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If refractory sections are joined with traditional sealing methods (refractory paper, sealant, or rope), then the joint can accommodate thermal expansion initially, but the joint deteriorates over time due to thermal cycling and eventually allows leakage
Solution Approach 1:
The joint structure combines multiple materials with complementary properties: metal mesh provides tensile strength and flexibility to accommodate thermal expansion, while refractory concrete provides high-temperature resistance and sealing capability. This composite construction creates a joint that maintains both flexibility and structural integrity under thermal cycling conditions.
Solution Approach 2:
The metal mesh is embedded within the refractory concrete before the joint is fully assembled, creating a pre-reinforced structure that anticipates future thermal stress and potential cracking. This preliminary reinforcement ensures the joint can withstand repeated thermal expansion and contraction without deteriorating.
2Reliability
If a rigid seal is used to prevent leakage, then sealing is effective initially, but the seal cannot accommodate thermal expansion and contraction, leading to cracking and leakage over time
Solution Approach 1:
The combination of metal mesh and refractory concrete creates a joint that is both rigid and flexible. The refractory concrete provides rigidity for sealing, while the embedded metal mesh provides flexibility to accommodate thermal expansion and contraction without cracking.
Solution Approach 2:
The metal mesh is strategically embedded within the refractory concrete at the joint interface, providing localized flexibility exactly where thermal expansion occurs, while the bulk of the refractory concrete maintains its rigid sealing properties.
3Reliability
If refractory sealant is forced into the gap between abutting surfaces, then the joint is sealed initially, but the sealant deteriorates with thermal cycling and allows direct leak paths to appear
Solution Approach 1:
The metal mesh is embedded in the refractory concrete before assembly, creating a reinforcement structure that prevents future cracking and deterioration of the sealant. This preliminary reinforcement protects the sealant from thermal stress throughout its service life.
Solution Approach 2:
The refractory concrete containing metal mesh provides a more durable sealing material than sealant alone. The composite structure resists thermal cycling better, preventing the formation of direct leak paths that would occur with sealant deterioration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains a sealed joint over time, even under thermal expansion and contraction, reducing the likelihood of molten metal penetration and protecting heating elements from damage.
Implementation Method 1
to accommodate thermal expansion or contraction
Implementation Method 2
the mesh body...creates a tortuous path for any molten metal that does penetrate the surface of the mesh body
Data Source
AI summary
An exemplary embodiment of the invention provides a method of preparing a reinforced refractory joint between refractory sections of a vessel used for containing or conveying molten metal, e.g. a metal-contacting trough. The method involves introducing a mesh body made of metal wires into a gap between metal-contacting surfaces of adjacent refractory sections of a vessel so that the mesh body is positioned beneath the metal conveying surfaces, and covering the mesh body with a layer of moldable refractory material to seal the gap between the metal-contacting surfaces. Other embodiments relate to a vessel formed by the method and a vessel section with a pre-positioned mesh body suitable for preparing a sealed joint with other such sections.