Sintered Contact Component with Oriented Grains
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Solution Overview
Problem
Existing electrical contact components for high voltage switches face challenges in achieving low electrical resistance and robustness due to material hardness and brittleness, requiring time-intensive heat treatments for hardening.
Innovation Solution
A contact component comprising a sintered contact element with grains oriented in a preferential direction through cold working, combined with a hardened contact carrier, allowing for efficient current conduction and deformation without stress cracks, using tungsten alloys and copper materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat treatment is used to harden the contact carrier, then hardness and electrical conductivity are improved, but production time and cost increase
Solution Approach 1:
The contact element is cold-worked before the contact carrier is cast onto it, so that the grains are oriented in a preferential direction and the contact element is pre-hardened. This preliminary action eliminates the need for subsequent heat treatment of the contact carrier, reducing production time while maintaining hardness and electrical conductivity properties
Solution Approach 2:
The heat treatment step is completely removed from the production process. The invention extracts the hardening function from the thermal processing stage and achieves it instead through cold working and grain orientation, thereby eliminating the time-consuming heat treatment while still achieving the required hardness
2Strength
If the contact element material is made harder to improve wear resistance, then durability is improved, but brittleness increases and deformation without cracks becomes difficult
Solution Approach 1:
The invention changes the microstructural parameters of the contact element by cold-working it to create a preferred grain orientation. This parameter change allows the material to maintain high hardness and wear resistance while improving its ability to deform without cracking, as the oriented grain structure provides a more favorable path for plastic deformation
Solution Approach 2:
The contact component is formed as a composite of the sintered contact element and the cast contact carrier. The contact element provides wear resistance while the contact carrier provides ductility and crack resistance. The metallurgical bond between these two materials creates a composite structure that combines the advantages of both materials, achieving wear resistance without excessive brittleness
3Loss of energy
If grains are oriented in a preferential direction through cold working, then electrical resistance is reduced, but additional processing steps are required
Solution Approach 1:
The invention merges the grain orientation function with the necessary cold working that is already required for shaping the contact component. The cold working process serves dual purposes: it shapes the component and simultaneously orients the grains in a preferential direction to reduce electrical resistance, eliminating the need for separate grain orientation treatment
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 solution results in a robust, low-loss contact component with reproducible properties, improved electrical conductivity, and reduced production time and costs compared to traditional heat treatment methods.
Implementation Method 1
the contact element has a lower electrical resistance in the preferential direction. In other words, the contact element or the contact component can conduct current with less loss in the preferential direction
Implementation Method 2
after the sintering, the contact element is in a cold-worked state or undergoes cold working, so that the grains of the contact element are in an elongated form and oriented along a preferential direction
Implementation Method 3
the contact carrier is hardened by the cold working
Data Source
AI summary
An electrical contact component and a method for the production thereof. The contact component has a sintered contact element and a contact carrier cast onto the contact element. The grains of the contact element are oriented in a preferential direction.