Friable Ceramic-Bonded Diamond Composite Particles
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Solution Overview
Problem
Ceramic-bonded diamond composites are typically formed in densified compact form, making them difficult to process into particulate form, limiting their use in wear and abrasive applications.
Innovation Solution
A method to produce ceramic-bonded diamond composite particles by forming a diamond feedstock with silicon particles, subjecting it to pre- and consolidation processes, and mechanically processing the densified compact to create friable particles with a high diamond content and specific size range, allowing for their use in abrasive and wear applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic-bonded diamond composites are formed as densified compacts, then the material achieves high strength and structural integrity, but it becomes difficult to mechanically process into particulate form
Solution Approach 1:
The patent changes the chemical composition parameters of the compact by incorporating boron carbide (B4C) and silicon carbide (SiC) in specific ratios (1-10 wt% B4C and 5-20 wt% SiC), which modifies the bonding characteristics to achieve optimal balance between strength and friability for particle formation
Solution Approach 2:
The patent creates a composite material system combining diamond grains with ceramic bonds (SiC and B4C) to achieve a material that simultaneously provides the strength needed for handling and the controlled friability required for mechanical processing into wear-resistant particles
2Quantity of substance
If the diamond feedstock is highly densified, then the composite achieves high diamond content and performance, but it resists mechanical breaking into particulate form
Solution Approach 1:
The patent optimizes the carbon-to-silicon ratio (1.5:1 to 3:1) and controls sintering temperature (1400°C to 1600°C) to create a densified compact with high diamond content that maintains controlled brittleness, enabling subsequent mechanical processing while preserving diamond integrity
Solution Approach 2:
The patent creates local variations in bonding strength within the compact by distributing B4C and SiC phases strategically, allowing certain regions to break more easily during mechanical processing while maintaining overall high diamond content and structural integrity
3Ease of manufacture
If the compact is made friable for easy particle formation, then mechanical processing becomes easier, but the abrasive and wear properties are minimized
Solution Approach 1:
The patent precisely controls the composition parameters (1-10 wt% B4C, 5-20 wt% SiC, diamond grain size 10-100 mesh) to achieve a friability threshold that allows particle formation while maintaining sufficient bonding strength to preserve abrasive and wear-resistant properties in the final particles
Solution Approach 2:
The patent creates a hierarchical structure where the outer regions provide controlled friability for particle formation while the core regions maintain strong diamond-diamond and diamond-ceramic bonds that preserve abrasive properties in the resulting particles
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 resulting ceramic-bonded diamond composite particles exhibit high diamond content and toughness, enabling their effective use in particulate form for applications such as cutting tools and grinding wheels, enhancing their abrasive and wear-resistant properties.
Implementation Method 1
The powder was heated in a crucible to 1400°C. The Si reacts completely to SiC, bonding together the diamond grains.
Implementation Method 2
the densified compact (or blank) is difficult to mechanically process, including mechanically breaking into particulate form
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
Ceramic-bonded diamond composite particle includes a plurality of diamond grains and silicon carbide reaction bonded to the diamond grains having a composition of 60-90 wt.% diamond, 10-40 wt.% silicon carbide, ≤2 wt.% silicon. Particles are formed by processes that forms granules in a pre-consolidation process, forms a densified compact including ceramic-bonded diamond composite material in a consolidation process or forms ceramic-bonded diamond composite material directly, and a post-consolidation process in which the densified compact or ceramic-bonded diamond composite material is mechanically broken to form a plurality of the particles. Inert or active material can be incorporated into the densified compact or coated on granules to reduce the number and extent of diamond to silicon carbide bonding occurring in the consolidation process and make the ceramic-bonded diamond composite material more friable and easily breakable into composite particles.