Boron Carbide Ceramic Bonding Layer for High-Strength Joints
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Solution Overview
Problem
Current bonding technologies for boron carbide-containing ceramics lack the ability to achieve high bond strength and chemical resistance, particularly for high-purity boron carbide ceramics, making them unsuitable for high-speed operating machine members and applications where chemical resistance is crucial.
Innovation Solution
A process involving the use of aluminum, copper, gold, zirconium, or their alloys as bonding materials, with specific heating conditions, to create a bonded boron carbide-containing ceramics body with a bond strength of 100 MPa or higher and improved chemical resistance, utilizing techniques such as foil, paste, or vapor deposition layers to interpose the bonding material between ceramic members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bonding materials (brazing materials or glass) are used to bond boron carbide-containing ceramics members, then the bonding process is simple, but the bond strength is insufficient for high-speed operating machine members
Solution Approach 1:
An aluminum-based intermediate layer is introduced between the boron carbide-containing ceramics members to facilitate strong bonding. The aluminum layer reacts with boron carbide to form aluminum boride and aluminum carbide compounds, creating a chemically bonded interface that achieves bond strength of 100 MPa or higher, suitable for high-speed operating machine members.
Solution Approach 2:
The bonding process utilizes controlled heating to specific temperature ranges to induce chemical reactions between aluminum and boron carbide. By controlling the heating parameters, the aluminum transforms into reactive states that form strong chemical bonds with the ceramics, achieving high bond strength while maintaining process simplicity.
2Reliability
If high-purity boron carbide ceramics are used, then the chemical resistance and hardness are excellent, but conventional bonding methods cannot achieve sufficient chemical resistance at the bonded interface
Solution Approach 1:
The bonded structure creates a composite material system consisting of boron carbide-containing ceramics, aluminum-based intermediate layer, and reaction products (aluminum boride and aluminum carbide). This composite structure at the bonded interface provides both high bond strength and excellent chemical resistance, as the reaction products form a stable, chemically resistant barrier.
Solution Approach 2:
The aluminum-based intermediate layer serves as a mediator that chemically bonds to high-purity boron carbide ceramics while providing chemical resistance. The aluminum and its reaction products create a protective interface that maintains chemical stability even when bonding high-purity ceramics that are difficult to bond conventionally.
3Productivity
If small boron carbide-containing ceramics members are bonded together to form large members, then the production cost is reduced, but achieving high bond strength for high-speed applications is difficult
Solution Approach 1:
The large boron carbide-containing ceramics member is segmented into multiple smaller members that are individually manufactured and then bonded together using the aluminum-based intermediate layer. This segmentation allows for easier manufacturing of individual pieces while the chemical bonding process ensures the assembled structure achieves the required bond strength for high-speed operating machine members.
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 process achieves a bonded boron carbide-containing ceramics body with high bond strength and improved chemical resistance, enabling its use in high-speed applications and expanding the utility of boron carbide ceramics in industrial settings.
Implementation Method 1
heating the members at least at parts to be bonded together
Implementation Method 2
bonding materials, which contain aluminum, copper, gold or zirconium or an alloy of these metals as a base
Data Source
Figure 1~2-1
Figure 2-2
Figure 2-3
AI summary
A bonded, boron carbide-containing ceramic body includes ceramic members. These ceramic members each contain boron carbide at 2 mass% or higher, and are integrated together via a bonding layer bonded with a bonding material containing at least one metal selected from the group consisting of aluminum, copper, gold and zirconium or integrated together via a bonding layer formed from one of aluminum metal and an aluminum compound and a titanium compound as bonding materials, wherein a bonded part has a strength of 100 MPa or higher. According to this technology, the boron carbide-containing ceramic members can be bonded together with a high strength of 100 MPa or more by a simple process, and further, the bonding is feasible with excellent chemical resistance at the bonded part as needed.