Reinforced PCD and PCBN Layers for Thin Crack-Resistant Tool Segments
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Solution Overview
Problem
There is a need for relatively thin and robust super-hard structures, efficient methods for making them, and processing techniques to create components for tools using polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PCBN) materials.
Innovation Solution
A sintered polycrystalline super-hard layer with reinforcement structures made of metals like molybdenum, niobium, or tungsten, bonded to the super-hard layer, which is formed using an ultra-high pressure and temperature process to create a robust and thin construction, and then processed into segments for tool components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the super-hard layer is reduced to create thin structures, then the weight and material usage are reduced, but the structural strength and resistance to cracking deteriorate
Solution Approach 1:
The patent applies composite materials by bonding the super-hard layer to reinforcement structures made of metals (molybdenum, niobium, tantalum, tungsten, or rhenium) or their alloys/compounds. This creates a composite structure where the thin super-hard layer retains its cutting properties while the reinforcement structures provide mechanical strength and crack resistance, resolving the contradiction between thinness and strength.
Solution Approach 2:
The patent segments the construction into distinct functional parts: the super-hard layer for cutting and the reinforcement structures for structural support. This segmentation allows each part to be optimized independently - the super-hard layer can be made thin for reduced material usage while the reinforcement structures provide the necessary strength.
2Device complexity
If conventional sintering methods are used without reinforcement structures, then the manufacturing process is simpler, but the resulting structures are prone to cracking and deformation
Solution Approach 1:
The patent applies preliminary action by incorporating reinforcement structures into the construction during the sintering process itself, rather than adding them afterward. The reinforcement structures are positioned in contact with the super-hard layer before sintering, so they are integrated into the final product in a single manufacturing step, maintaining process simplicity while ensuring reliability.
3Strength
If high temperature sintering is applied to create strong bonds, then the bonding strength is improved, but the risk of thermal deformation and material degradation increases
Solution Approach 1:
The patent applies parameter changes by utilizing the high melting points of refractory metals (molybdenum, niobium, tantalum, tungsten, rhenium) to withstand the sintering temperatures required to bond the super-hard layer. These reinforcement structures maintain their structural integrity at sintering temperatures, enabling strong bonding without excessive thermal deformation or material degradation.
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 enables the production of thin, robust super-hard layers with enhanced mechanical properties, such as high Young's modulus and tensile strength, suitable for tool components with reduced risk of cracking and deformation, improving manufacturing efficiency and tool performance.
Implementation Method 1
subjecting the encapsulated pre-sinter stack to an ultra-high sinter pressure and sufficiently high sinter temperature and for a sufficient sinter period to form the construction
Implementation Method 2
each of which is bonded to a respective reinforcement structure
Data Source
Figure 1~2
Figure 3
AI summary
A construction comprising a sintered polycrystalline super-hard layer having mutually opposite reinforced boundaries, each of which is bonded to a respective reinforcement structure, in which the super-hard layer comprises polycrystalline diamond (PCD) material or polycrystalline cubic boron nitride (PCBN) material. The construction will be configured such that the equivalent circle diameter of each reinforced boundary is at least ten times the mean thickness of the super-hard layer between them. The reinforcement structures will be substantially free of material having a melting point of less than 2,000 degrees Celsius, at least adjacent the reinforced boundaries.