Sn-CuNi Intermetallic Sliding Member for Motor Durability
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Solution Overview
Problem
Existing sliding members in rotary devices, such as motors, face durability issues due to resin-based materials that abrade and release powders, leading to short circuits, while non-resin-based materials require high sintering temperatures, complicating manufacturing and increasing costs.
Innovation Solution
A sliding member with a slide-contact portion made from an intermetallic compound, such as Cu6Sn5 or Ni3Sn4, produced by reacting Sn or its alloys with CuNi, CuMn, AgPd, or CuCr alloys, which has a lower sintering temperature and higher melting point, enhancing durability and manufacturing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resin-based materials are used for sliding members, then ease of manufacture is improved, but durability deteriorates due to abrasion and powder release
Solution Approach 1:
The patent uses composite materials consisting of metal powder (such as copper, silver, or aluminum) mixed with thermoplastic resin. This composite structure combines the ease of manufacture from resin-based materials with improved durability and reduced powder release from metal-containing compositions. The metal powder particles are distributed throughout the resin matrix to create a sliding member that maintains structural integrity while being manufacturable through conventional processes.
Solution Approach 2:
The patent modifies the chemical composition parameters of the sliding member by incorporating specific metal powders (copper, silver, aluminum) with controlled particle sizes and concentrations into the thermoplastic resin. By adjusting these compositional parameters, the material achieves optimal balance between manufacturability and durability, reducing abrasion resistance issues while maintaining ease of manufacturing through thermoplastic processing.
2Reliability
If non-resin-based materials are used for sliding members, then durability is improved, but manufacturing complexity increases due to high sintering temperature requirements
Solution Approach 1:
The patent fundamentally changes the processing temperature parameter by using thermoplastic resin as the binding matrix instead of requiring high-temperature sintering. The sliding member is manufactured by molding the metal powder-resin mixture at relatively low temperatures (below the decomposition temperature of the thermoplastic resin), then heat-treating at controlled temperatures to form the intermetallic compound. This parameter change eliminates the need for high-temperature sintering equipment and complex manufacturing processes while maintaining durability through the formation of robust intermetallic compounds.
Solution Approach 2:
The patent utilizes phase transitions of the thermoplastic resin during processing. The resin transitions from a solid powder state to a molten state during molding, allowing the metal powder particles to be embedded and consolidated. Subsequent controlled heat treatment induces phase transitions in the metal components, forming intermetallic compounds with enhanced durability. These phase transitions occur at manageable temperatures that simplify manufacturing compared to traditional high-temperature sintering methods.
3Reliability
If high sintering temperature is applied to non-resin-based materials, then durability is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent changes the temperature parameter from high-temperature sintering (1350°C or above for silicon carbide, 700°C or above for carbon-based materials) to low-temperature thermoplastic processing followed by moderate heat treatment. This parameter change prevents thermal distortion and dimensional changes associated with high-temperature sintering, thereby maintaining high manufacturing precision and dimensional accuracy while still achieving durable intermetallic compound formation through controlled heat treatment at lower temperatures.
4Ease of manufacture
If resin-based materials are used for sliding members, then ease of manufacture is improved, but harmful factors increase due to carbon powder release causing short circuits
Solution Approach 1:
The patent changes the compositional parameters by replacing carbon-based fillers with metal powders (copper, silver, aluminum) in the thermoplastic resin matrix. This compositional change eliminates the generation of carbon powder during operation, as metal powders do not combust or decompose to form fine particles under normal operating conditions. The metal powder particles remain stable and embedded in the resin, preventing the harmful powder release that causes short circuits while maintaining ease of manufacture through thermoplastic processing.
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 intermetallic compound sliding member offers improved durability and easier, more accurate manufacturing compared to resin-based and non-resin-based brushes, with enhanced abrasion resistance and heat dissipation through a porous structure, reducing the risk of powder release and maintaining high conductivity.
Implementation Method 1
an intermetallic compound produced by reaction between first metal which is Sn or an alloy including Sn and second metal which is a CuNi alloy, a CuMn alloy, an AgPd alloy, a CuAl alloy, or a CuCr alloy
Implementation Method 2
enhanced abrasion resistance and heat dissipation through a porous structure
Data Source
AI summary
A slide-contact portion of a motor has a slide-contact face that contacts a rotating rotor. The slide-contact portion is composed of a material containing an intermetallic compound phase produced by chemical reaction between a first metal which is Sn or an alloy including Sn and a second metal which is a CuNi alloy, a CuMn alloy, an AgPd alloy, a CuAl alloy, or a CuCr alloy.