Ceramic Liner Segmentation for Furnace Efficiency
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Solution Overview
Problem
Current furnace liners in foundries face challenges with sintering aids reducing refractory properties and shortening service life, and the need for additional heat cycles to remove metal forms, which decreases furnace efficiency and increases contamination risks during metal production.
Innovation Solution
A ceramic liner with a monolithic body featuring a discontinuous amorphous phase on the surface portion that can sinter at lower temperatures than the metal form, allowing for its removal before heating the bulk portion, thereby extending the liner's service life and improving furnace efficiency without the need for pre-sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sintering aids are used in lining mixes to allow sintering at lower temperatures, then the metal form can be removed more easily, but the liner becomes less refractory and service life is significantly shortened
Solution Approach 1:
The patent divides the liner into two distinct portions: a surface portion containing sintering aids that enables low-temperature sintering and form removal, and a bulk portion that is substantially free of sintering aids to maintain high refractory properties and long service life. This segmentation allows each portion to serve its specific function without compromising the other.
Solution Approach 2:
The sintering aids are localized specifically in the surface portion of the liner where they are needed for form removal, while the bulk portion maintains high purity and refractory characteristics. This local quality approach ensures that sintering aids do not compromise the overall service life of the liner.
2Ease of manufacture
If metal forms are kept in the furnace after lining installation, then the lining can be installed using a simple metal form, but additional heat cycles are required to wash out the residual metal, reducing furnace efficiency
Solution Approach 1:
The patent enables the metal form to be removed immediately after low-temperature sintering by incorporating sintering aids in the surface portion, eliminating the need for subsequent heat cycles to wash out residual metal. This preliminary removal action prevents contamination and allows the furnace to be used immediately for metal production.
3Reliability
If the bulk portion of the liner is sintered at high temperatures, then the liner achieves high refractory properties, but the metal form must withstand these temperatures which complicates the installation process
Solution Approach 1:
The patent segments the sintering process into two stages: first, low-temperature sintering of the surface portion to remove the metal form, and second, high-temperature sintering of the bulk portion to achieve refractory properties. This segmentation simplifies the installation process by allowing form removal before the bulk is sintered.
Solution Approach 2:
The surface portion with sintering aids performs the preliminary function of enabling form removal at low temperatures, which simplifies the overall installation process before the bulk portion is sintered at high temperatures to achieve the desired refractory properties.
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 enables the ceramic liner to withstand extreme heat without degradation, reduce metal contamination, and extend the service life of the liner, while also improving furnace efficiency by allowing the metal forms to be reused and reducing the number of heat cycles required.
Implementation Method 1
The surface portion can sinter at a temperature lower than the melting temperature of a lining form used to install the ceramic liner
Implementation Method 2
applying heat to transfer at least a portion of the coating from the form to the bulk material
Data Source
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AI summary
A ceramic liner can include a monolithic body having a surface portion and a bulk portion. The surface portion can have a thickness less than the total thickness of the monolithic body. The monolithic body can include an amorphous phase. The amorphous phase can be discontinuous. At least one member of the discontinuous phase can be embedded in the surface portion. The bulk portion can be substantially free of the amorphous phase. A method of forming a ceramic liner can include providing a furnace with a coating and a bulk material of the ceramic liner and heating the bulk material and the coating. In an embodiment, a coated lining form can be used to provide the coating. In a particular embodiment, the coating can be transferred to the bulk material from the coated lining form.