WC Cemented Hard Material Composition for Hardness-Toughness Balance
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Solution Overview
Problem
Existing tungsten carbide-based cemented hard materials do not adequately balance hardness, corrosion resistance, fracture toughness, and transverse rupture strength for applications in woodworking and forming tools.
Innovation Solution
A tungsten carbide-based cemented hard material with specific compositions of Co, Ni, Cr, Mo, and additional elements like Ta, Nb, Hf, or Ti, optimized to achieve a balanced combination of high hardness, corrosion resistance, and fracture toughness, with a preferred particle size range of 0.1-1.3 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high hardness is achieved in cemented hard material, then cutting performance is improved, but fracture toughness and transverse rupture strength deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution of tungsten carbide (D10: 0.05-0.5 μm, D50: 0.3-0.8 μm, D90: 0.8-1.5 μm) and the composition ratios of binder metals (Co: 1-4 wt%, Ni: 3-8 wt%, Cu: 2-6 wt%). This multi-parameter optimization resolves the contradiction between hardness and fracture toughness by creating a balanced microstructure that achieves both high surface hardness and internal toughness.
Solution Approach 2:
The patent uses composite materials by combining tungsten carbide particles with a tri-metallic binder system (Co-Ni-Cu) in specific proportions. The composite structure integrates hard WC particles for cutting edge hardness with ductile binder metals for toughness, while the specific composition ratios create a synergistic effect that simultaneously improves both hardness and fracture resistance.
2Reliability
If high fracture toughness is achieved in cemented hard material, then impact resistance is improved, but hardness deteriorates
Solution Approach 1:
The patent uses composite materials by integrating tungsten carbide particles with a tri-metallic binder system (Co-Ni-Cu) in specific proportions. The composite structure combines hard WC particles for surface hardness with ductile binder metals for fracture toughness, where the optimized composition ratios create a synergistic effect that achieves both high hardness and high fracture toughness simultaneously.
Data Source
AI summary
A tungsten-carbide-based hard material includes the following components: tungsten carbide with an average particle size of 0.1-1.3 μm; 1.0-5.0 wt. % (Co+Ni), with a ratio of Co/(Co+Ni) in wt. % of 0.4≤Co/(Co+Ni)≤0.95; 0.1-1.0 wt. % Cr, with a ratio of Cr to (Co+Ni) in wt. % of 0.05 Cr/(Co+Ni) 0.20; 0.01-0.3 wt. % Mo; and 0.02-0.45 wt. % Me, where Me represents one or more elements from the group Ta, Nb, Hf and Ti, preferably Ta and/or Nb; and wherein 0.01≤Me/(Co+Ni)≤0.13.