Cemented Carbide Composition for Wear-Resistant Cutting Tools
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Solution Overview
Problem
There is a need for a cemented carbide that can extend the lifetime of tools used for high-efficiency processing of hard-to-cut materials like titanium alloys and stainless steel, as existing tools have limited durability and efficiency.
Innovation Solution
A cemented carbide composition comprising tungsten carbide particles, a second hard phase containing TiNbC, TiNbN, or TiNbCN, and a binder phase with cobalt, optimized in terms of particle size, volume percentage, and dispersion, which provides enhanced mechanical strength, welding resistance, and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional cemented carbide with WC and iron-group element binder is used, then manufacturing simplicity is maintained, but tool lifetime is limited
Solution Approach 1:
The patent uses a composite hard phase consisting of tungsten carbide particles combined with fine ceramic particles (titanium carbonitride, titanium carbide, and/or zirconium carbide) in specific size ranges. This composite structure provides both the toughness of WC and the wear resistance of ceramics, extending tool lifetime while managing composition complexity through defined particle size distributions and phase ratios
Solution Approach 2:
The patent optimizes multiple parameters including binder phase content (8-16 vol%), fine ceramic particle content (0.1-0.5 vol%), and particle size distributions (D10, D50, D90 values) to achieve the balance between mechanical strength and wear resistance. These parameter changes transform the conventional single-phase structure into a multi-phase composite with controlled morphology and distribution
2Strength
If hard phase particle size is increased for mechanical strength, then breakage resistance improves, but wear resistance deteriorates
Solution Approach 1:
The hard phase is segmented into two distinct particle size ranges: larger tungsten carbide particles (D10: 0.30-0.60 μm, D90: 0.90-1.40 μm) providing mechanical strength and breakage resistance, and finer ceramic particles (average diameter 0.03-0.50 μm) providing wear resistance. This segmentation allows each particle size to fulfill its specific functional role without compromising the other
Solution Approach 2:
Different regions of the cemented carbide exhibit different local qualities: areas with larger WC particles provide toughness and impact resistance, while areas with finer ceramic particles provide wear resistance. The binder phase distribution is also optimized locally, with average particle diameter 0.15-0.45 μm and degree of dispersion 0.15-0.25, ensuring uniform mechanical properties throughout the material
3Strength
If binder phase content is increased for mechanical strength, then toughness improves, but welding resistance deteriorates
Solution Approach 1:
The binder phase content is precisely controlled within 8-16 vol%, with the binder consisting of 80 mass% or more cobalt. This parameter optimization ensures sufficient toughness while limiting the binder amount that could cause welding. The fine particle size distribution of the binder (average diameter 0.15-0.45 μm, D95 ≤ 1.5 μm) further optimizes the balance between mechanical strength and welding resistance by reducing binder aggregation
Data Source
AI summary
A cemented carbide is composed of a first hard phase, a second hard phase, and a binder phase, wherein the first hard phase is composed of tungsten carbide particles and having a particle diameter D10 of 0.30 μm to 0.60 μm, a particle diameter D90 of 0.90 μm to 1.40 μm, the second hard phase contains at least one first compound selected from the group consisting of TiNbC, TiNbN, and TiNbCN, and having an average particle diameter of 0.03 μm to 0.50 μm, a content of the binder phase in the cemented carbide is 8.0 vol % to 16.0 vol %, an average particle diameter of the binder phase is 0.15 μm to 0.45, a particle diameter D95 of the binder phase is 1.5 μm or less, and a degree of dispersion of the binder phase is 0.15 to 0.25.