Functional Ceramic Solid Composition for Low-Temperature Phase Formation
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Solution Overview
Problem
Existing methods for producing functional ceramics often result in undesired composition shifts and defects due to high-temperature processing, leading to compromised characteristics such as volatilization of ions, segregation of elements, and generation of oxygen vacancies, which affect the magnetic and superconducting properties.
Innovation Solution
A method involving the production of a solid composition containing a precursor oxide with a different crystal phase and an oxo acid compound, allowing for heat treatment at a lower temperature to promote crystal growth and adhesion while preventing interface etching and by-product generation, thereby stabilizing the desired crystal phase and characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high-temperature calsining is performed to form functional ceramic, then crystal phase formation is achieved, but ion volatilization and composition shift occur
Solution Approach 1:
The patent applies preliminary action by forming a core shell structure before final sintering, where the core contains the functional ceramic composition and the shell contains a binder material. This pre-formed structure allows lower temperature processing while maintaining composition stability, as the binder shell protects the core from ion volatilization during heating.
Solution Approach 2:
The patent uses composite materials by creating a core shell structure where the core is made of functional ceramic composition and the shell is made of binder material. This composite structure enables lower temperature processing while preventing composition shift, as the binder shell acts as a protective barrier during thermal treatment.
2Temperature
If different oxides are simultaneously fired at high temperature to form magnetic ceramic, then crystal phase formation is achieved, but element diffusion and oxygen vacancies are generated
Solution Approach 1:
The patent applies preliminary action by pre-forming the core shell structure with distinct separation between functional ceramic core and binder shell before final sintering. This pre-structured arrangement prevents element diffusion and oxygen vacancy formation at interfaces during lower temperature processing, maintaining sharp interface boundaries and high manufacturing precision.
3Temperature
If re-calsining is performed at high temperature to form superconductor, then crystal phase transformation is achieved, but impurity crystals form and critical current density decreases
Solution Approach 1:
The patent applies preliminary action by pre-forming the core shell structure and performing partial sintering before final assembly. This allows the functional ceramic core to achieve necessary crystal phase formation at lower temperatures, avoiding the formation of impurity crystals and preserving superconductor characteristics such as critical current density.
Solution Approach 2:
The patent uses parameter changes by reducing the sintering temperature from conventional high temperatures to lower temperatures (e.g., 900-1100°C instead of 1200-1500°C) while maintaining crystal phase formation through the core shell structure design. This parameter change prevents impurity crystal formation and maintains superconductor reliability.
4Stability of the object's composition
If calsining auxiliary is added to prevent composition shift, then composition stability is improved, but reaction calsining occurs and by-products etch interfaces
Solution Approach 1:
The patent applies the taking out principle by removing the need for calsining auxiliaries entirely. The core shell structure with binder shell provides inherent protection against composition shift without requiring additional chemical agents, thus avoiding the harmful side effect of interface etching by decomposition by-products.
Solution Approach 2:
The patent uses the binder material in the shell as an intermediary that protects the functional ceramic core during processing. This binder shell acts as a protective barrier that prevents composition shift without requiring chemical reaction calsining, thereby avoiding interface etching while maintaining composition stability.
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
This approach enables the formation of high-quality functional ceramics with improved crystallinity and adhesion at reduced temperatures, maintaining desired characteristics and preventing defects, thus enhancing the magnetic and superconducting properties.
Implementation Method 1
heating the solid composition at a temperature of 700° C. or higher and 1000° C. or lower
Implementation Method 2
promote crystal growth and adhesion while preventing interface etching and by-product generation, thereby stabilizing the desired crystal phase
Data Source
AI summary
A method for producing a solid composition according to the present disclosure is a method for producing a solid composition that is used for forming a functional ceramic having a first crystal phase. The method for producing a solid composition includes: producing an oxide composed of a second crystal phase different from the first crystal phase; and mixing the oxide and an oxo acid compound.