High-quality graphite molds are specially designed for the semiconductor, vacuum furnace and new energy industries, offering high-density and high-precision solutions, significantly enhancing equipment lifespan and production efficiency.
quality graphite molds, we have been deeply involved in the semiconductor lithography, vacuum heat treatment, and new energy battery industries. We empower high-end manufacturing with innovative technologies. Our high-quality graphite molds are made of high-density graphite with a nano-level surface polishing (purity 99.99%), and the thermal expansion coefficient is only 2.8 × 10⁻⁶ /°C - 40% lower than the industry standard. The measured data shows that in the production of lithium-ion battery electrodes, a single mold cavity has no cracks after 1000 vacuum heat cycles, while the competing molds have failed after 450cycles
Why choose our high-quality graphite molds?
More usage times
In vacuum furnace applications, the mold life is extended by over 50% (800 times vs 400 times), and the downtime is reduced by 30%;
Better materials
The thermal conductivity is as high as 185 W/m·K, and the surface roughness is controlled within Ra ≤ 0.8 μm, ensuring that the semiconductor lithography scrap rate is reduced from 20% to 5%;
Customized scenarios
For 5G radio frequency equipment, we provide thermodynamic simulation optimization, enabling the assembly accuracy of battery electrode sheets to reach ±0.5 μm (the actual measured yield of an international customer has increased by 22%).
Huixian Jincheng Abrasive & Graphite Mold Factory
Huixian Jincheng Abrasive & Graphite Mold Factory is a professional manufacturer specializing in custom graphite machining and graphite components for high-temperature industries.
Founded in 1984, our factory is located in Huixian City, Henan Province, China, one of the important industrial regions for graphite processing and advanced materials manufacturing.
With nearly 30 years of experience in graphite machining, we have developed strong capabilities in producing high precision graphite parts for multiple industries, including vacuum furnaces, semiconductor equipment, metallurgy, photovoltaic crystal growth, EDM machining, and new energy materials.
Our production and equipment
WhatsApp: +86 15617175030
15
years
We have been working in the industry since 2011
32
certificates
We have obtained most of the professional certificates in the industry and insist on international standards of production.
18
awards
We have won a lot of awards for strong creativity
| classification | specific project | Core requirements/scope | Explanation (adapted to fuel cell requirements) |
| 1. Physical characteristics | |||
| density | 1.80-1.95g/cm ³ (mainstream 1.85-1.90g/cm ³) | Low density → high porosity, easy to leak; Excessive → difficult processing and increased cost, 1.85-1.90g/cm ³ balances performance and cost | |
| Porosity (after immersion) | ≤ 5% (substrate porosity of 15% -20%) | Pores need to be filled by impregnation to prevent hydrogen/oxygen leakage and electrolyte leakage, ensuring the sealing of the fuel cell stack | |
| water absorption rate | ≤1% | Low water absorption rate avoids the impact of material water absorption on conductivity and structural stability | |
| 2. Conductivity and thermal conductivity | |||
| volume resistivity | ≤ 10 μ Ω· m (preferably ≤ 8 μ Ω· m) | Low resistivity reduces current conduction loss, improves stack efficiency, and meets the conductivity requirement of ≥ 180S/cm for the stack | |
| thermal conductivity | ≥120W/(m·K)(25℃) | Quickly conduct the reaction heat of the fuel cell stack, avoid local overheating causing aging of the membrane electrode, and adapt to water-cooled/air-cooled heat dissipation systems | |
| 3. Mechanical properties | |||
| compressive strength | ≥ 60MPa (preferably ≥ 80MPa) | Resist the assembly pressure of the fuel cell stack (usually 0.5-1.0MPa) to prevent deformation or rupture | |
| Shore hardness (HS) | ≥ 60 (after immersion) | Improve surface wear resistance, reduce friction loss with membrane electrodes, and extend service life | |
| fracture toughness | ≥1.2MPa·m¹/² | Avoid brittle fracture during processing or use, and adapt to frequent start-up and shutdown conditions of the reactor | |
| 4. Chemical properties | |||
| Fixed carbon content | ≥ 99.95% (high-purity grade), preferably ≥ 99.99% | Low impurities (ash content ≤ 5ppm) prevent corrosion products from contaminating the membrane electrode, ensuring a 5000-8000 hour service life of the fuel cell stack | |
| ash content | ≤ 5ppm (preferably ≤ 3ppm) | Impurities (Fe, Si, Al, etc.) can catalyze the degradation of membrane electrodes and need to be strictly controlled | |
| corrosion resistance | Resistant to 0.5-2.0mol/L H ₂ SO ₄ (80 ℃) and 100% humidity environment, without corrosion or leaching | Adapt to the acidic operating environment of fuel cells, with no performance degradation after long-term use | |
| 5. Processing accuracy | |||
| flatness | ≤ 0.02mm/m (preferably ≤ 0.015mm/m) | Ensure a tight fit with the membrane electrode, reduce contact resistance, and prevent gas leakage | |
| dimensional tolerance | ± 0.03mm (critical dimension) | Adapt to the assembly accuracy requirements of the distribution stack to avoid sealing failure caused by dimensional deviations | |
| Channel machining accuracy | Channel width/depth tolerance ± 0.02mm, surface roughness Ra ≤ 0.8 μ m | Uniformly distribute hydrogen/oxygen to reduce fluid resistance and improve stack reaction efficiency | |
| 2, Characteristics of graphite material | 1. Core Features | High purity, high density, low porosity, excellent electrical and thermal conductivity, strong chemical stability, good corrosion resistance | Directly matching the core requirements of "leakage prevention, low loss, and long life" for fuel cells |
| 2. Feature adaptability | -High purity → corrosion-resistant and free from impurity pollution; -High density → low porosity leakage prevention; -High conductivity and thermal conductivity → reduce energy loss | The one-to-one correspondence between characteristics and technical parameters is the basis for meeting the operating conditions of fuel cells | |
| 3. Limitations and improvements | High brittleness and weak impact resistance → strength is improved by impregnating resin/metal; High processing difficulty → Optimizing CNC technology | Limitations need to be addressed through material selection and processing to adapt to actual usage scenarios | |
| 3, Selection criteria | 1. Substrate type | Prioritize isostatic pressed graphite (with good isotropy) and exclude molded graphite (with anisotropy affecting conductivity and heat conduction) | Isostatic pressure graphite ensures uniform performance in various areas of the fuel cell stack, avoiding local heating or poor conductivity |
| 2. Key indicators of substrate | Fixed carbon ≥ 99.95%, ash content ≤ 5ppm, density 1.85-1.90g/cm ³, porosity 15% -20% | The performance of the substrate directly determines the final quality of the bipolar plate, and strict control of the source material selection is required | |
| 3. Selection of impregnating materials | -Conventional scenario: Phenolic resin (low cost, mature process); -Mid to high end scenarios: epoxy resin (with excellent temperature resistance); -High power scenario: Copper/Tin (enhances strength and thermal conductivity) | Based on user needs, phenolic resin is suitable for medium power and cost sensitive scenarios, accounting for over 80% of the market share | |
| 4. Material selection verification | A substrate testing report (fixed carbon, ash content, density) and a post impregnation performance testing report (porosity, corrosion resistance) are required | Ensure that the material selection meets the supply chain access standards of fuel cell manufacturers | |
| 4, Processing requirements | 1. Core process | CNC precision machining → vacuum pressure impregnation → curing treatment → surface polishing → factory inspection | Each process affects the final performance, and impregnation and processing accuracy are key control points |
| 2. Key processing parameters | -CNC machining: spindle speed 10000-15000rpm, feed rate 50-100mm/min; -Immersion process: Vacuum degree ≤ 0.095MPa, temperature 160-180 ℃, insulation 2-4 hours; - Surface treatment: Ra ≤ 0.8 μ m | Optimize processing parameters to reduce edge breakage and cracks, and ensure uniform pore filling through impregnation parameters | |
| 3. Key process requirements | -Channel processing: using ball end milling cutters to avoid sharp corners (to prevent stress concentration); -Immersion: resin solid content of 30% -40%, ensuring penetration depth | The design of the flow channel affects gas distribution, and the impregnation quality determines the anti leakage performance | |
| 4. Testing standards | Factory inspection items: density, porosity, resistivity, flatness, dimensional tolerance, airtightness (gas permeability ≤ 1 × 10 ⁻⁸ cm ²/s) | ||
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