Near-Net Superhard Cutting Insert Shaping Before HPHT Sintering
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Solution Overview
Problem
Current methods for producing superabrasive cutting tools require extensive machining to achieve the desired size and shape, which is inefficient and costly.
Innovation Solution
A method involving preparing a slurry of diamond powder, silicon, silicon nitride, and a temporary organic binder, forming granules, compacting them into a defined shape, pre-sintering, embedding in a containment powder, and sintering at high pressure and temperature to create a near-net superhard material body with minimal internal defects and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional HPHT process with powder loading is used, then superhard material body can be produced, but extensive machining is required to achieve desired size and shape
Solution Approach 1:
The invention performs preliminary shaping by compacting granules into a soft green body with the desired near-net shape before the HPHT sintering process. This preliminary action eliminates the need for extensive post-machining operations, as the green body already possesses the target geometry with minimal deviations that can be corrected during sintering.
Solution Approach 2:
The invention changes the physical state and properties of the material through controlled parameter variations. By adjusting compaction pressure, heating temperature, and holding time during HPHT processing, the soft green body transforms into a hard sintered body with the desired near-net shape, reducing machining requirements while maintaining dimensional accuracy.
2Manufacturing precision
If extensive machining is performed to achieve desired shape, then precision is improved, but fabrication cost increases
Solution Approach 1:
The desired shape is preliminarily formed during the green body compaction stage using inexpensive tooling. This preliminary shaping action eliminates the need for costly post-sintering machining operations, thereby reducing fabrication costs while maintaining the required shape accuracy.
Solution Approach 2:
The invention uses disposable or low-cost containment means and tooling during the compaction and sintering processes to achieve the desired shape. These inexpensive forming tools replace expensive precision machining operations, reducing overall manufacturing costs while maintaining product quality.
3Device complexity
If standard processing method is used, then production is simpler, but internal defects are present in the final product
Solution Approach 1:
The invention optimizes processing parameters including heating temperature (100-2000°C), holding time (1-24 hours), and pressure conditions during HPHT sintering. These parameter changes promote complete densification and elimination of internal defects while maintaining process simplicity through a single-step sintering operation.
Solution Approach 2:
The soft green body is preliminarily prepared with optimal granule composition, size distribution, and compacted density before sintering. This preliminary preparation ensures uniform material distribution and eliminates voids or defects that would otherwise persist through the sintering process, achieving defect-free products without complex post-processing.
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 method results in near-net superhard material bodies with reduced internal defects and equivalent or improved performance compared to standard processed tools, eliminating the need for extensive machining and reducing fabrication costs.
Implementation Method 1
drying the slurry to remove the fluid and to form granules
Implementation Method 2
heating the soft green body in a furnace to form a hard green body
Implementation Method 3
providing additional silicon adjacent to and to infiltrate the hard green body
Implementation Method 4
sintering the hard green body positioned within the containment means at high pressure and high temperature
Data Source
Figure 1
Figure 2a~3
Figure 4
AI summary
A method of making a near-net superhard material body includes preparing granules from a mixture of superhard powder, binders, and fluids, compacting the granules to form a soft green complex-shaped body, heating the soft green body in a furnace to form a hard green body free from residual binders, embedding one or more of the hard green bodies in a containment powder or a containment means and forming a pressure cell, sintering the cell at high pressure and high temperature, and removing the containment powder from the cell or removing the inserts from the containment means to reveal one or more near-net bodies.