TiCN Sintered Cutting Tool Composition for Heat and Fracture Resistance
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Solution Overview
Problem
Cutting tools made from cemented carbide or cermet exhibit low heat-resistance and are not suitable for high-speed machining, while those with ceramic sintered bodies lack fracture resistance, making them inadequate for machining steel materials with high cutting resistance.
Innovation Solution
A sintered body comprising first and second hard particles with TiCN and (Ti, M) (C, N) compositions, third hard particles with TiCN cores and (Ti, M) (C, N) peripheries, dispersed particles of Al, Zr, or Si, and a binding phase of Co, Ni, Re, and Ru, with a thin grain boundary and dislocations, enhancing wear and fracture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cemented carbide or cermet is used as base material, then fracture resistance is improved, but heat-resistance deteriorates
Solution Approach 1:
The invention uses a composite material consisting of TiCN hard particles dispersed in a Co-Ni-Re-Ru binding phase matrix. This composite structure combines the high strength and fracture resistance of TiCN with the high heat-resistance of the refractory metal-containing binding phase, achieving both improved fracture resistance and heat-resistance simultaneously
Solution Approach 2:
The invention changes the chemical composition parameters of the binding phase by adding refractory metals (Re and Ru) to the Co-Ni system. This parameter change increases the melting point and thermal stability of the binding phase, thereby improving heat-resistance while maintaining fracture resistance through the composite microstructure
2Temperature
If ceramics sintered body is used as base material, then heat-resistance is improved, but fracture resistance deteriorates
Solution Approach 1:
The invention creates a metal-ceramic composite where TiCN hard particles are embedded in a ductile Co-Ni-Re-Ru binding phase. Unlike brittle ceramic sintered bodies, this composite maintains fracture resistance through the ductile metal matrix while achieving heat-resistance through the refractory metal components and stable carbide structure
3Productivity
If high-speed machining is performed, then productivity is improved, but wear resistance deteriorates
Solution Approach 1:
The invention optimizes the binding phase composition by adding refractory metals (Re and Ru) which increase thermal stability and reduce softening at high temperatures. This parameter change enables the material to maintain wear resistance even during high-speed machining operations where temperatures are elevated
Solution Approach 2:
The TiCN-Co-Ni-Re-Ru composite structure provides enhanced wear resistance through the hard TiCN particles resisting abrasive wear while the refractory metal-containing binding phase resists thermal degradation and adhesive wear, enabling sustained performance during high-speed machining
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 sintered body provides excellent wear and fracture resistance in high-speed machining, inhibiting high-temperature softening and improving binding strength, thermal conductivity, and reducing thermal expansion, thus enabling efficient machining of steel materials at increased cutting speeds.
Implementation Method 1
the binding phase has a thickness of not greater than 5 nm at at least a part of a grain boundary between the third hard particles adjacent to each other
Implementation Method 2
The sintered body having excellent wear resistance and fracture resistance in high-speed machining
Implementation Method 3
the binding phase further contains at least one of Re and Ru, and has a thickness of not greater than 5 nm at at least a part of a grain boundary between the third hard particles adjacent to each other
Data Source
AI summary
A sintered body and cutting tool, the sintered body (2) including: a first hard particle (10) containing TiCN; a second hard particle (20) containing (Ti, M) (C, N); a third hard particle (30) including a core portion (31) containing TiCN, and a peripheral portion (32) enclosing the core portion (31) and containing (Ti, M) (C, N) each as main components; a particle (40) containing at least one of Al, Zr, and Si; and a binding phase (50) containing at least one of Co and Ni and at least one of Re and Ru, and has a thickness of not greater than 5 nm. The third hard particle (30) has, in the core portion (31), a particle (33) containing at least one selected from Co, Ni, Re, and Ru, and has a dislocation (34) in each of the core portion (31) and the peripheral portion (32).