Ceramic-Metal Joint Structure with Corrosion-Resistant Solder
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional joint structures between ceramic and metal members in devices like heat exchangers face challenges with insufficient wettability and corrosion resistance, especially when exposed to gases such as exhaust gas from internal combustion engines.
Innovation Solution
A joint structure incorporating a glass portion and a metal solder portion with higher corrosion resistance, where the metal solder contacts a larger area of the gas than the glass, ensuring strong bonding and high corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If only metal solder is used for jointing the ceramic member and metal member, then the jointing process is simple, but the wettability with respect to the ceramic member is insufficient and jointing property cannot be secured
Solution Approach 1:
The patent applies composite materials by creating a joint portion composed of both glass and metal solder. The glass component provides excellent wettability with the ceramic member, while the metal solder ensures strong bonding strength. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both good jointing property and manufacturing feasibility.
Solution Approach 2:
The patent applies local quality by creating distinct regions within the joint portion: a glass-rich region adjacent to the ceramic member for optimal wettability, and a metal solder-rich region for strong bonding. This spatial differentiation of material composition allows each material to perform its optimal function at the appropriate location, resolving the wettability issue while maintaining jointing reliability.
2Reliability
If glass is used for jointing the ceramic member and metal member, then wettability with respect to the ceramic member is improved, but corrosion resistance with respect to gas is reduced
Solution Approach 1:
The patent uses composite materials to combine the advantages of glass (excellent wettability with ceramic) and metal solder (high corrosion resistance). The resulting joint portion has both good jointing property due to the glass component and high corrosion resistance due to the metal solder component, effectively resolving the contradiction between wettability and corrosion resistance.
Solution Approach 2:
The patent applies local quality by positioning the metal solder component to be exposed to the gas environment, where it provides corrosion protection, while the glass component remains in contact with the ceramic member, providing wettability. This spatial arrangement allows each material to address its specific functional requirement, resolving the contradiction between jointing property and corrosion resistance.
3Reliability
If a joint portion with both glass and metal solder is used, then both jointing property and corrosion resistance are improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the glass and metal solder into a single joint portion that simultaneously provides both wettability and corrosion resistance. Rather than using separate layers or components, the glass and metal solder are combined in one joint structure, reducing overall device complexity while achieving multiple functions.
Solution Approach 2:
The patent uses composite materials to create a joint portion that inherently provides both jointing property and corrosion resistance in a single integrated component. This composite approach avoids the need for multiple separate components or complex assembly processes, thereby reducing device complexity while maintaining high reliability.
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 joint structure secures jointing properties and provides high corrosion resistance to gases, improving the durability and performance of ceramic-metal member connections in gas-exposed devices.
Implementation Method 1
the glass has sufficient wettability with respect to the metal member and higher wettability with respect to the ceramic member than the metal solder
Data Source
AI summary
A joint structure jointing a ceramic member and a metal member is a joint structure jointing a ceramic member and a metal member that are provided in a device provided on a portion through which gas passes. The joint structure has a joint portion that joints the ceramic member and the metal member. The joint portion includes a glass portion made of a glass and a metal solder portion having higher corrosion resistance with respect to the gas than the glass. An area where the metal solder portion contacts to the gas is larger than an area where the glass portion contacts to the gas.