Cemented Carbide Plastic Deformation Resistance
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Solution Overview
Problem
There is a limit to the improvement in plastic deformation resistance of cemented carbides, which is essential for achieving longer-lasting cutting tools and dies under stricter machining conditions.
Innovation Solution
A cemented carbide with a hard phase comprising 80% or more tungsten carbide and a binder phase with an iron-group element, where the ratio of tungsten carbide particles with one or fewer contact points to the total number of particles is 0.05 or less, ensuring robust binding and increased contact points between tungsten carbide particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the composition of cemented carbide is adjusted to improve plastic deformation resistance, then the plastic deformation resistance is improved to a certain extent, but there is a limit to further improvement
Solution Approach 1:
The invention changes the parameter of tungsten carbide particle contact points from a compositional parameter to a structural parameter. By controlling the number of contact points between particles (B/A ratio) rather than just adjusting chemical composition, the patent achieves superior plastic deformation resistance that cannot be obtained through composition adjustment alone.
Solution Approach 2:
The invention creates a composite microstructure where tungsten carbide particles are arranged with specific contact point configurations. The binder phase (iron-group element) and hard phase (tungsten carbide) form a composite structure where the spatial arrangement and contact points between particles are optimized to enhance plastic deformation resistance beyond what composition alone can achieve.
2Strength
If the number of contact points between tungsten carbide particles is increased, then plastic deformation resistance is improved, but the manufacturing precision required to achieve this structure increases
Solution Approach 1:
The invention performs preliminary arrangement of tungsten carbide particles before final sintering. By pre-positioning particles to achieve the desired contact point configuration (B/A ≤ 0.05) and using green strength during the forming stage, the complex particle arrangement is achieved without requiring extremely high manufacturing precision in the final sintering process.
Solution Approach 2:
The invention allows dynamic adjustment of particle arrangements during the forming and sintering processes. The green compact can be adjusted and repositioned to achieve optimal contact point configurations, and the sintering process itself allows for some particle rearrangement, making the system dynamic rather than static in achieving the desired structure.
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 configuration enhances the plastic deformation resistance of the cemented carbide, leading to cutting tools with extended life and improved machining efficiency under demanding conditions.
Implementation Method 1
a binder phase containing, as a main component, an iron-group element
Implementation Method 2
JP 2015-101746 A discloses a method for preparing a cemented carbide. The method includes the steps of mixing WC carbide powder, other material and solvent; forming with the mixed powder into a predetermined shape; and firing the formed body at the temperature within the range of 1350°C to 1450°C.
Data Source
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AI summary
Provided are a cemented carbide having excellent plastic deformation resistance and a cutting tool in which the cemented carbide is used as a substrate. A cemented carbide includes a hard phase containing tungsten carbide particles and a binder phase containing, as a main component, an iron-group element, wherein the formula B/A ≤ 0.05 is satisfied, where A represents the number of the tungsten carbide particles, and B represents the number of tungsten carbide particles whose number of contact points with other tungsten carbide particles is 1 or less. Preferably, the iron-group element includes cobalt, and the cobalt content in the cemented carbide is 8% by mass or more. Preferably, the tungsten carbide particles have an average particle diameter of 3 µm or more.