MgB2 Wire Joint Pressurizing Member Design
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Solution Overview
Problem
The existing methods for joining magnesium diboride (MgB2) wires fail to achieve a dense sintered body at the joint portion, leading to inadequate conducting properties and reliability due to insufficient pressurization and mechanical support of the B powder, resulting in potential voids and reduced adhesion between the MgB2 core and sintered body.
Innovation Solution
A pressurizing member is designed with a space for filling Mg in a portion not adjacent to the B powder-filled area, allowing for high-density pressurization of B powder and mechanical support during heat treatment, ensuring a firm MgB2 sintered body formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If B powder is filled in the end portion of the wire and Mg powder is filled thereon for forming MgB2 sintered body, then the joint portion can be formed, but the sintered body is not dense enough leading to inadequate conducting properties
Solution Approach 1:
The container is divided into multiple chambers: a first chamber for holding B powder and a second chamber for holding Mg powder. This segmentation allows independent control and optimization of each powder's filling and pressurization, enabling the B powder to be densely packed before Mg powder is added, thus forming a dense MgB2 sintered body with excellent conducting properties
Solution Approach 2:
B powder is filled and pressurized into a dense state in the first chamber before Mg powder is added in the second chamber. This preliminary densification of B powder ensures that when Mg powder is subsequently added and pressurized, the resulting MgB2 sintered body achieves high density and excellent conducting properties
2Reliability
If pressurization is applied to B powder and Mg powder to form dense sintered body, then conducting properties improve, but the mechanical support during heat treatment is insufficient causing potential voids
Solution Approach 1:
The first chamber containing densely packed B powder is nested within the second chamber containing Mg powder. Both chambers are together nested within the container. This nested structure provides mechanical support during heat treatment, preventing void formation while maintaining the density achieved through pressurization
3Device complexity
If Mg powder is filled directly on B powder without separate chamber, then the structure is simpler, but adhesion between MgB2 core and sintered body is reduced
Solution Approach 1:
The container is segmented into a first chamber for B powder and a second chamber for Mg powder, with each chamber having controlled access to the wire end portion. This segmentation ensures proper layering and contact between powders and the wire core, enhancing adhesion between the MgB2 core and the formed sintered body while maintaining manageable structural complexity
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 results in a joint portion with excellent conducting properties and high reliability, preventing void formation and enhancing adhesion between the MgB2 core and sintered body, enabling stable operation of superconducting magnets without quenching.
Implementation Method 1
a method is described, in which only B powder is filled in the end portion of the wire and Mg powder is filled thereon
Implementation Method 2
A sintered body of MgB2 is formed by heat treatment, and the wires are joined to each other
Implementation Method 3
performing heat treatment is disclosed. A sintered body of MgB2 is formed by heat treatment
Data Source
AI summary
The present invention provides a joint portion of MgB2 superconducting wires having exceptional energization characteristics and high reliability. The joint portion of the superconducting wires according to the present invention has a space for filling Mg into a portion inside a container or pressurizing member, the portion not being adjacent to an MgB2 sintered body.