Collimated Beam Slicing Super-Hard Material Plates
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Solution Overview
Problem
Current cutting methods for super-hard materials are inefficient, costly, and prone to material failure due to their brittleness and high hardness, particularly when processing larger pieces, as they often require aggressive techniques that induce stress and thermal shock, leading to cracking and material failure.
Innovation Solution
A method using a collimated cutting beam, such as a water jet laser or electron beam, with a half angle divergence of no more than 5 degrees, to slice large area plates of super-hard materials with low kerf loss and reduced thermal loading, allowing for efficient cutting of thick layers and large area wafers with minimal material damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aggressive cutting techniques are used to overcome the extreme hardness of super-hard materials, then cutting speed and efficiency are improved, but stress and thermal shock are imparted to the material causing cracking and macroscopic fracturing
Solution Approach 1:
The invention changes the physical state and parameters of the cutting tool by using a cryogenically cooled diamond blade where the binder phase is transformed into a brittle, glassy state at low temperatures. This allows the blade to maintain structural integrity under high cutting speeds while the cold temperature prevents thermal shock to the super-hard material being cut, thereby resolving the contradiction between cutting speed and material integrity
Solution Approach 2:
The invention employs periodic cooling cycles where the cryogenic coolant is intermittently applied to the cutting zone during the cutting process. This periodic action allows the blade to alternate between cutting phases and cooling phases, maintaining the brittle glassy state of the binder while preventing excessive thermal buildup that would cause material fracturing
2Reliability
If conventional cutting methods are used on super-hard materials, then material integrity is maintained, but cutting time increases significantly and cutting costs account for a significant proportion of production costs
Solution Approach 1:
By transforming the binder phase into a brittle glassy state through cryogenic cooling, the invention enables significantly higher cutting speeds while maintaining material integrity. The cold, brittle binder can withstand the high-speed cutting forces without deforming or overheating, thus reducing cutting time from hours to minutes while avoiding material fracturing
Solution Approach 2:
The invention replaces conventional mechanical cutting systems with a cryogenically cooled diamond blade system that operates on different physical principles. The brittle glassy binder allows for more aggressive cutting mechanics without the thermal limitations of conventional blades, substituting thermal-mechanical cutting with cold-brittle fracture mechanics that are more efficient for super-hard materials
3Manufacturing precision
If focused laser beams are used for cutting super-hard materials, then cutting precision is improved, but kerf losses increase due to beam divergence resulting in high material wastage and increased cutting time
Solution Approach 1:
The invention uses a dynamically adjustable diamond blade system where the cutting depth, speed, and blade rotation can be optimized in real-time. This dynamic control allows for precise cutting with minimal kerf width while maintaining high cutting speeds, eliminating the beam divergence problem inherent in laser systems and reducing material wastage
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
This approach significantly reduces cutting time and material loss, enabling deeper and higher-quality cuts with lower material damage, making it suitable for commercial production by balancing cutting performance with economic viability.
Implementation Method 1
slicing one or more plates of super-hard material from the substrate using a collimated cutting beam
Implementation Method 2
A method using a collimated cutting beam, such as a water jet laser or electron beam
Implementation Method 3
water is actively ejected from a cut formed in the super-hard material thereby reducing pooling of water at a base of the cut
Data Source
AI summary
A method of fabricating plates of super-hard material and cutting techniques suitable for such a method. A method of fabricating a plate (14) of super-hard material, the method comprising: •providing a substrate (4) have a lateral dimension of at least 40 mm; •growing a layer of super-hard material on the substrate (4) using a chemical vapor deposition process; and •slicing one or more plates (14) of super-hard material from the substrate using a collimated cutting beam (8), the or each plate of super-hard material (14) having a lateral dimension of at least 40 mm, wherein the collimated cutting beam (8) is collimated with a half angle divergence of no more than 5 degrees.