I. Core Positioning and Product Classification
The graphite materials used for diamond saw blades are mainly divided into two categories:
Graphite molds for the sintering of diamond saw blades: These are used for the high-temperature sintering molding of the blade body of diamond saw blades, performing the dual functions of heat generation elements and mold support, and determining the dimensional accuracy and appearance quality of the saw blades.
Graphite workpieces for diamond saw blade cutting: These refer to various graphite products that are cut by diamond saw blades, such as graphite electrodes, graphite boats, and graphite molds. This article focuses on the graphite molds used for sintering diamond saw blades. This is a core and crucial material in the manufacturing of diamond tools, accounting for approximately 15-20% of the production cost of the saw blades, and directly affects the cutting efficiency, service life and processing accuracy of the saw blades.
II. Core Technology Parameter Comparison Table (2026 Official Measurement Results)
Data Source: Joint test report of China Hard Materials Association and National Graphite Materials Testing Center in April 2026. The test standards are based on GB/T 3074.1-2017, ISO 12988.2-2020, and ASTM C1179-2021.
Basic feature
| Application scenario | Power range | Recommended type | Core advantages |
| Commercial vehicles (heavy trucks / | passenger cars) 60~120kW | High-purity graphite bipolar plates | Long service life, low attenuation, vibration resistance |
| Special vehicles | 20 - 60 kW | Expanded graphite composite panel | Resistant to high and low temperatures, impact resistant |
| Passenger vehicles | 30 - 80 kW | Pressed graphite composite panel | Lightweight, low cost, mass production |
| Fixed carbon content | GB/T 3521-2021 | 99.99% | 99.99% |
| Volume density | GB/T 24528-2009 | 1.75 - 1.80 g/cm³ | 1.85 - 1.90 g/cm³ |
III. Core Performance Characteristics (Data Support)
1. Ultra-high temperature stability, suitable for sintering process
With a maximum temperature of 2500°C, it shows no deformation or softening even at the sintering temperature of diamond saw blades (800 - 1000°C), and the dimensional stability reaches 99.9%.
Thermal conductivity is 140 - 180 W/(m·K), which is 7 - 9 times that of stainless steel, ensuring uniform heating of the saw blade body and a hardness deviation of ≤ 5 HRC.
The linear expansion coefficient is as low as 1.8 × 10⁻⁶/°C, matching well with the thermal characteristics of the diamond body, reducing the risk of cracking after cooling by 60%.
2. High purity and low impurities, ensuring saw blade quality
Fixed carbon content ≥ 99.99%, ash content ≤ 5 ppm, without metal impurities contaminating the diamond body, improving the sharpness of the saw blade by 30%.
Strong chemical inertness, not reacting with diamond, metal bodies (Fe, Cu, Co, etc.) at high temperatures, ensuring the bonding strength of the body ≥ 120 MPa.
Porosity ≤ 5%, preventing metal molten liquid from penetrating, reducing the surface defect rate to below 0.3%.
3. High strength and high density, extending mold life
Isostatic pressing process, density reaches 1.90 - 1.95 g/cm³, compressive strength ≥ 150 MPa, flexural strength ≥ 90 MPa, capable of withstanding 500 tons of sintering pressure.
Excellent thermal shock resistance, no cracks after 50 cycles of 1000°C ⇌ 25°C, suitable for high-frequency sintering production rhythm.
Machinability is improved by 80%, high-end customized models have a service life of 2000 times, extending 4 times compared to ordinary graphite molds.
4. Precision processing capability, achieving complex flow channels
Processing accuracy up to ± 0.01mm, flow channel surface roughness Ra ≤ 0.1 μm, ensuring uniform distribution of diamond, improving saw blade cutting efficiency by 25%.
Five-axis联动 CNC processing, capable of manufacturing complex irregular molds, suitable for different specifications of diamond saw blades (diameter 100 - 3000mm).
Easy processing, processing efficiency is 10 times higher than hard alloy, and the mold development cycle is shortened by 40%.
Core Technology Breakthroughs and Innovation Directions
1. Ultra-high Temperature Anti-Oxidation Technology
SiC + BN Composite Coating: Vacuum negative pressure impregnation depth reaches 2-3mm, 1200℃ high-temperature weight loss rate drops to below 0.8%, mold life is extended by 50%
Gradient Functional Materials: Outer layer is a high-density anti-oxidation layer + inner layer is a high-conductivity layer, balancing anti-oxidation and thermal conductivity performance
2. Precision Forming and Processing Technology
Cold Isostatic Pressing Technology: Pressure ≥ 200MPa, density uniformity error of the preform ≤ 0.02g/cm³, strength increases by 60%
Nanometer-level Precision Machining: Utilize ultra-precise CNC machines, positioning accuracy reaches ±0.001mm, meeting the production requirements for ultra-thin diamond saw blades (≤ 1mm)
3. Material Composite Reinforcement Technology
Carbon Fiber Reinforced Graphite: Add 5-10% carbon fibers, strength increases by 80%, thermal conductivity increases by 20%, suitable for high-power saw blade production
Graphene Modification: Add 0.5-1% graphene, friction coefficient drops from 0.45 to 0.26, wear reduction by 68%, mold life is increased by 3 times
4. Intelligent Mold Design
CAE Simulation Optimization: Through finite element analysis to optimize the flow channel design, uniformity of metal molten liquid filling improves by 30%, saw blade performance consistency improves by 25%
Modular Design: Quick replacement of different specifications of molds, production efficiency increases by 40%, production cost reduces by 20%
