Cemented Carbide Body with Zr,NbC for Thermal Deformation
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Solution Overview
Problem
Cemented carbide cutting tools face challenges in balancing wear resistance and thermal deformation resistance, often resulting in a trade-off with toughness and other properties, as seen in existing compositions that enhance one property at the expense of another.
Innovation Solution
A cemented carbide body comprising a tungsten carbide phase, a binder phase with iron group metals or alloys, a solid solution phase of zirconium and niobium carbides (Zr,Nb)C, and cubic carbides, with a coating of metallic and non-metallic elements from specific Periodic Table groups applied via PVD or CVD, optimizing the balance between wear resistance, thermal deformation, and toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the resistance of a cemented carbide body to deformation is increased, then thermal deformation resistance is improved, but toughness deteriorates
Solution Approach 1:
The patent applies composite materials by combining multiple carbide phases (WC, ZrC, NbC, HfC) with different properties in a single cemented carbide body. The refractory carbides (ZrC, NbC, HfC) provide thermal deformation resistance while the tungsten carbide matrix maintains toughness, resolving the contradiction between thermal stability and mechanical韧性
Solution Approach 2:
The patent changes the compositional parameters by incorporating specific amounts of refractory carbides (ZrC, NbC, HfC) ranging from 0.1-5.0 mass% each, along with controlling the binder phase composition. This parameter optimization allows achieving improved thermal deformation resistance while maintaining adequate toughness through balanced composition design
2Reliability
If wear resistance is enhanced through compositional changes, then cutting tool longevity is improved, but other properties such as toughness and thermal conductivity deteriorate
Solution Approach 1:
The patent uses composite materials combining WC (providing toughness and thermal conductivity) with ZrC, NbC, and HfC (providing wear resistance). This composite structure achieves improved wear resistance while maintaining the toughness and thermal conductivity provided by the WC matrix and binder phase
Solution Approach 2:
The patent applies local quality by creating a multi-phase microstructure where different carbide phases are distributed throughout the matrix. The refractory carbides (ZrC, NbC, HfC) are dispersed to provide localized wear resistance, while the WC matrix and binder phase maintain overall toughness and thermal conductivity
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 described cemented carbide body demonstrates enhanced resistance to thermal deformation and wear without significant loss of toughness, as evidenced by improved performance in deformation, toughness, and interrupted cut testing, showcasing a balanced set of properties suitable for metalworking applications.
Implementation Method 1
a coating deposited thereon by physical vapor deposition (PVD)
Implementation Method 2
chemical vapor deposition (CVD)
Data Source
AI summary
In one aspect, cemented carbide bodies are provided. A cemented carbide body described herein, in some embodiments, comprises a tungsten carbide phase, a binder phase comprising at least one metal of the iron group or an alloy thereof, a solid solution phase of carbides of zirconium and niobium (Zr,Nb)C and cubic carbides in an amount ranging from about 0.5 volume percent to about 6 volume percent.