Sr-Nb Ceramic Dielectric Composite for Thermal Stability
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Solution Overview
Problem
Current ceramic dielectrics used in electronic components face challenges in achieving high dielectric constants and thermal stability over a wide temperature range, which is crucial for applications in high-temperature devices such as electric vehicles and smart cars.
Innovation Solution
A ceramic dielectric composite is developed, comprising a first dielectric with a tetragonal system and a second dielectric with an orthorhombic system, both containing strontium (Sr) and niobium (Nb), along with additional metals or semi-metals, which are synthesized using a layered ceramic powder and subjected to acid-exchange treatment and sintering to maintain a high dielectric constant and resistivity across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single dielectric material is used, then the manufacturing process is simple, but the dielectric constant and thermal stability cannot be simultaneously optimized
Solution Approach 1:
The patent employs a composite dielectric material comprising two distinct ceramic phases: a first dielectric with tetragonal crystal system (e.g., Sr1-aBaaNb2O6 or Sr6Nb10O30) and a second dielectric with orthorhombic crystal system (e.g., Sr2Nb2O7). This composite structure enables simultaneous optimization of dielectric constant and thermal stability, resolving the contradiction between manufacturing simplicity and performance reliability.
2Reliability
If high dielectric constant materials are used, then capacitance performance is improved, but thermal stability deteriorates due to Curie temperature effects
Solution Approach 1:
The patent utilizes parameter changes by controlling the crystal structures of the constituent dielectrics. The first dielectric maintains tetragonal structure and the second maintains orthorhombic structure across the operating temperature range, preventing phase transitions that would cause Curie temperature effects. This enables the composite to achieve both high dielectric constant (≥800) and thermal stability without significant variation up to 200°C.
3Stability of the object's composition
If a composite with multiple crystal systems is used, then thermal stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-determining the crystal structures of the constituent dielectrics before final sintering. The first dielectric is designed to form tetragonal structure and the second to form orthorhombic structure through controlled composition ratios and sintering conditions. This preliminary structuring ensures that the composite achieves the desired thermal stability while maintaining manageable manufacturing precision requirements.
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 composite exhibits a dielectric constant of at least 800 at room temperature and maintains stability up to 200°C, with minimal variation, ensuring effective performance in high-temperature applications without a Curie temperature within the operational range, thus providing improved thermal stability and performance.
Implementation Method 1
performing acid-exchange treatment of the layered ceramic powder
Implementation Method 2
sintering the pellet to obtain a composite comprising a first dielectric and a second dielectric
Data Source
AI summary
Disclosed are a ceramic dielectric including a composite of a first dielectric and a second dielectric, wherein each of the first dielectric and the second dielectric includes strontium (Sr) and niobium (Nb) and has a different crystal system, a ceramic electronic component, and a device.