Choosing a diamond composite sheet requires a comprehensive matching of four dimensions: application scenario, geological/processing conditions, performance indicators, and cost. It should consider wear resistance, heat resistance, impact resistance, and economy. The following are systematic selection steps:
Step 1: Match the Application Scenario and Determine the Category
First, determine the composite sheet type based on the intended use. The core requirements differ significantly across different fields:
Table: Application Field | Core Requirements | Recommended Type
Oil/Gas Drilling | Impact Resistance, High Temperature Resistance | Drilling and Production Cutting Teeth (Spherical/Conical) | Deep Cobalt Filtering PDC
Geological/Coal Drilling | Balance Wear Resistance and Toughness | Drilling and Production | Conventional Flat Composite Sheet
Metal/Non-Metal Cutting | High Wear Resistance, High Precision | Mechanical Tooling | Custom Shaped Composite Sheet
Stone/Concrete Grinding | Cost-Effectiveness Prioritized Grinding Tool Standard Composite Sheets
Step Two: Matching Performance Parameters to Working Conditions
Prioritize key indicators based on specific working conditions:
Geological Hardness/Machining Object Compatibility
Soft Formations (Drillability below 9): Prioritize low wear ratio (10~30×10⁴), focusing on impact resistance and toughness to reduce costs.
Medium-Hard/Complex Formations: Prioritize high wear ratio (>30×10⁴), while requiring high interfacial bonding strength to prevent delamination.
Deep Drilling (Depth > 3500m): Must select products with cobalt filtration process, requiring heat resistance ≥1000℃ to cope with high-temperature downhole conditions.
Specification Selection
Diameter: Larger diameter composite sheets have higher synthesis efficiency and are suitable for large-size drill bits; smaller diameters are suitable for precision drill bits or small tools.
Diamond Layer Thickness: Higher lifespan requirements necessitate thicker diamond layers (currently 2-4mm is the mainstream), but increased thickness increases costs. A balanced selection is sufficient; there's no need to excessively pursue ultra-thick layers.
