Oxide Modification Layer on Ceramic Substrates for Thermal Shock Resistance
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Solution Overview
Problem
Ceramic heating bodies in electronic atomization devices suffer from poor thermal shock resistance and are prone to microcracks, leading to reduced service life due to poor thermal matching and low resistance to thermal cycles.
Innovation Solution
A modification layer composed of silicon dioxide, aluminum oxide, and lithium oxide, with optional additives, is applied to the ceramic substrate, enhancing thermal matching and resistance to thermal shocks through a specific formulation and processing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional modification layer is applied to the ceramic substrate, then the ceramic heating body achieves basic heating function, but the modification layer has poor thermal shock resistance and is prone to microcracks
Solution Approach 1:
The invention changes the chemical composition parameters of the modification layer by incorporating specific amounts of lithium oxide (0.1-6 parts), barium oxide (0.1-6 parts), and other oxides in controlled proportions. This compositional parameter adjustment optimizes the thermal expansion coefficient matching between the modification layer and ceramic substrate, thereby improving thermal shock resistance and preventing microcrack formation during thermal cycling
Solution Approach 2:
The invention creates a composite modification layer system combining multiple oxide components (silicon dioxide, aluminum oxide, lithium oxide, barium oxide, etc.) that work synergistically. This composite formulation enhances the overall thermal shock resistance and structural integrity of the modification layer, preventing the ceramic heating body from developing microcracks during long-term use
2Duration of action of stationary object
If the ceramic heating body is used for long-term heating, then the heating function is maintained, but the heating layer may be torn off due to microcracks in the modification layer
Solution Approach 1:
The invention addresses thermal expansion mismatch by carefully selecting and proportioning the oxide components in the modification layer, particularly lithium oxide and barium oxide, which have thermal expansion properties that bridge the gap between the ceramic substrate and the heating layer. This ensures consistent adhesion during thermal cycling and extends service life
Solution Approach 2:
The multi-component oxide composite in the modification layer provides enhanced mechanical bonding and thermal stability, preventing the heating layer from detaching during long-term operation. The composite structure absorbs thermal stress more effectively, maintaining heating layer integrity over extended service periods
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 modification layer improves thermal shock resistance, preventing microcracks and extending the service life of the ceramic heating body by maintaining structural integrity under thermal cycling.
Implementation Method 1
the modification layer has good matching with the ceramic substrate in terms of thermal expansion coefficient, and has good resistance to thermal shocks
Data Source
AI summary
A modification layer on a surface of a ceramic substrate, includes, in parts by mass: 56 to 67.5 parts of silicon dioxide; 12 to 18 parts of aluminum oxide; and 2.8 to 5.5 parts of lithium oxide. In an embodiment, the modification layer includes, in parts by mass: at least one of 1.8 to 2.8 parts of phosphorus pentoxide; 0.5 to 2.0 parts of calcium oxide; 0.15 to 1.5 parts of magnesium oxide; and 2.5 to 5.25 parts of barium oxide.