Refractory Composition for Thermal Shock and Creep Resistance
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Solution Overview
Problem
Refractory articles used in high-temperature processes face challenges with corrosion, shock, and deformation, leading to frequent replacement or repair, necessitating improved resistance to shock and creep.
Innovation Solution
A refractory composition comprising 50-90% chamotte, 5-25% mullite, 3-20% fused silica, and 3-30% aqueous colloidal silica binder, with specific particle size distributions and proportions, providing enhanced high-temperature shock and creep resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional refractory compositions are used, then manufacturing simplicity is maintained, but shock resistance and creep resistance deteriorate at high temperatures
Solution Approach 1:
The patent employs a composite refractory material system combining four key components: chamotte (50-90%), mullite (5-25%), fused silica (3-20%), and aqueous colloidal silica binder (3-30%). This multi-component composite structure synergistically improves shock resistance through chamotte's thermal stability, mullite's high-temperature strength, fused silica's thermal shock resistance, and colloidal silica's binding properties, thereby resolving the contradiction between reliability and composition complexity
Solution Approach 2:
The patent optimizes specific parameter ranges for each component to achieve enhanced performance: chamotte particle size distribution (35-65% by weight), mullite content (5-25%), fused silica (3-20%), and colloidal silica binder (3-30%). These controlled parameter variations within defined ranges enable the composition to achieve superior shock and creep resistance while maintaining manufacturability, addressing the technical contradiction
2Productivity
If refractory articles are used in high temperature processes, then industrial production continues, but frequent replacement or repair is required due to corrosion, shock and deformation
Solution Approach 1:
The patent applies local quality enhancement by selecting specific particle size distributions and proportions of different refractory components. The chamotte is divided into multiple particle size fractions (35-65% by weight), and each component is positioned to provide localized functional benefits: larger particles for structural framework, smaller particles for filling voids, and colloidal silica for binder distribution. This localized optimization extends service life while maintaining continuous production
Solution Approach 2:
The patent performs preliminary action by pre-mixing all refractory components with the aqueous colloidal silica binder before casting into the final article form. This preliminary mixing ensures uniform distribution of all components and proper bonding throughout the structure before the article is subjected to high-temperature service, thereby extending its operational duration and reducing replacement frequency
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 refractory composition exhibits excellent high-temperature shock resistance and creep resistance, reducing the need for frequent replacement and minimizing downtime in industrial processes.
Implementation Method 1
about 3% to about 30% by weight of an aqueous colloidal silica binder
Implementation Method 2
excellent shock resistance and creep resistance at high temperatures
Data Source
AI summary
A method of making a refractory article having excellent high-temperature thermal shock resistance and creep resistance is provided. The method includes the step of providing a refractory composition primarily composed of chamotte having controlled particle sizes. The refractory composition may also include mullite, fused silica, calcined alumina and microsilica having controlled particle sizes, and further includes an aqueous colloidal silica binder. The refractory composition is then formed into a refractory article, which is dried and hardened.