Cemented Carbide Insert Gamma Phase Wear Resistance
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Solution Overview
Problem
Cemented carbide inserts used in mining operations with gamma phase carbides suffer from brittleness, leading to premature cracking and reduced lifespan when subjected to percussive drilling, as they do not provide improved wear resistance without increasing brittleness.
Innovation Solution
A sintered cemented carbide insert with a mean WC grain size of 0.8-18 μm, a binder phase of 4-18 wt %, and gamma phase precursors of 0.8-10 wt %, subjected to a high energy post-treatment to enhance wear resistance without increasing brittleness, allowing for the use of recycled carbide materials and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If gamma phase carbides are added to improve wear resistance, then wear resistance is improved, but brittleness increases leading to premature cracking
Solution Approach 1:
The patent applies parameter changes by precisely controlling the gamma phase content within 0.8-10 wt% and WC grain size within 0.8-18 μm ranges. This optimization ensures sufficient wear resistance from gamma phase while preventing excessive brittleness that would cause cracking during percussive drilling operations.
Solution Approach 2:
The patent creates a composite cemented carbide material combining multiple phases (gamma phase carbides, WC, and binder phase) with specific proportions. This composite structure achieves synergistic effects where gamma phase provides wear resistance while the controlled composition maintains overall toughness and reliability for mining applications.
2Strength
If gamma phase carbides are added to improve wear resistance, then lifespan is reduced due to cracking, but wear resistance is improved
Solution Approach 1:
The patent optimizes parameters including gamma phase content (0.8-10 wt%), WC grain size (0.8-18 μm), and binder phase (4-18 wt%) to achieve the best balance between wear resistance and lifespan. This controlled composition prevents premature cracking while maximizing wear resistance for extended insert service life in mining operations.
3Quantity of substance
If recycled carbide materials are used, then material availability is improved, but composition control becomes difficult affecting performance
Solution Approach 1:
The patent establishes specific parameter ranges (gamma phase: 0.8-10 wt%, WC grain size: 0.8-18 μm, binder phase: 4-18 wt%) that provide manufacturing flexibility when using recycled carbide materials. These controlled ranges ensure consistent performance and composition control even with recycled inputs, enabling effective utilization of available materials.
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 cemented carbide inserts with improved wear resistance and extended lifespan, enabling their use in demanding mining applications like percussive drilling without the risk of premature cracking, and allows for the utilization of previously unsuitable carbide compositions.
Implementation Method 1
a sintered cemented carbide insert for mining or cutting applications
Data Source
AI summary
A sintered cemented carbide insert for mining or cutting applications includes a mean WC grain size of between 0.8-18 μm, a binder phase in a weight between 4-18 wt %, a gamma phase with the cubic gamma phase precursors in a weight of between 0.8-10 wt %, and any unavoidable impurities and a balance of WC. A difference between the hardness at any point 0.3 mm from the surface of the insert and the hardness of the bulk is at least 25 HV3, wherein hardness is measured according to ISO EN6507. A method of producing the cemented carbide is also provided.