Product Overview
We offer three main product categories – carbon fiber hard felt, soft felt, and C/C composite materials – designed to meet the insulation and structural component requirements for high-temperature thermal fields such as single-crystal furnaces, polycrystalline furnaces, sapphire furnaces, and vacuum sintering furnaces. These materials can withstand long-term operating temperatures exceeding 2000°C; their density, porosity, and dimensional specifications can all be customized according to customer drawings. Each batch is inspected before delivery and is certified in compliance with the ISO 9001 Quality Management System.
Product Advantages and Features
- ● High temperature resistance; can be used stably in high-temperature environments exceeding 2000°C for extended periods.
- ● Controllable density and porosity, balancing thermal insulation performance with structural strength.
- ● Customized dimensions according to drawings, compatible with various furnace types and thermal field configurations
- ● Batch consistency is verified through testing, thereby reducing the risk of furnace batches being scrapped due to material failure.
Specifications and Product Classification
- ● C/C composite materials (CFC): Carbon fiber-reinforced carbon-based composites featuring high strength and thermal shock resistance; used for thermal field support and load-bearing structural components.
- ● Hard felt: High-density carbon fiber felt with stable molding properties, used for the furnace insulation layer and fixed structural components.
- ● Soft felt: Flexible carbon fiber felt that can be bent and fitted; used for furnace body sealing, joint filling, and buffer layer applications.
|
Performance Metrics |
C/C composite material (CFC) |
Carbon fiber hard felt |
Carbon fiber soft felt |
|
Typical density: g/cm³ |
1.40-1.50 |
0.20-0.30 |
0.10-0.16 |
|
mechanical strength |
High strength – suitable for use as load-bearing structural components. |
Medium; suitable for machining and forming. |
Low; flexible – non-load-bearing |
|
Rigidity / Shape |
Rigid hard components |
Rigid panels, machinable |
Flexible roll material, bendable |
|
Long-term vacuum operating temperature |
2200℃ |
2000-2200℃ |
2000-2200℃ |
|
Thermal conductivity |
secondary |
Low thermal conductivity, excellent insulation |
Low, offering optimal thermal insulation performance |
|
main application |
Thermal field support, load-bearing and force-bearing components |
Furnace side-wall insulation layer; fixed insulation components |
Sealing and joint filling, buffering, and external auxiliary insulation |
|
Can be machined |
✅ High-precision CNC machining |
✅ Cuttable and machined |
❌ Not suitable for machining; intended for cutting and use only. |
Application Scenarios
Carbon fiber hard felt, soft felt, and C/C composite materials are widely used for thermal field insulation and structural support in monocrystalline silicon pulling furnaces, as well as for insulation layers in polycrystalline silicon ingot casting furnaces and sapphire crystal growth furnaces. Industrial furnaces, such as vacuum sintering furnaces and powder metallurgy furnaces, also rely on these materials to maintain thermal field stability and control energy consumption. For the selection of specific furnace types and the design of insulation layers, please refer to our Thermal Field Application Solutions for Monocrystalline Furnaces/ Vacuum Furnaces.
|
material |
Core Positioning |
photovoltaic |
Semiconductor Silicon-Based |
Third-generation semiconductors (SiC/GaNPVT/MOCVD) |
Industrial high-temperature furnace |
|
C/C composite material (CFC) |
✅ Load-bearing structural components |
CZ furnace crucible and flow guide tube – designed to withstand thermal shock |
12-inch single-crystal furnace guide sleeve and load-bearing fixture |
PVT crucible/seed crystal holder, MOCVD support tray |
Sintered carrier plate, fixture |
|
Carbon fiber hard felt |
✅ Fixed-form insulation lining (self-supporting) |
Monocrystalline furnace chamber side-wall insulation |
High-purity furnace chamber insulation sleeve |
PVT furnace inner-side primary insulation (low impurity content) |
Flue chamber insulation lining – resistant to airflow erosion |
|
Carbon fiber felt |
✅ Filling seal with cushioning – no force application required |
Seal joint filling for the outer surface of the furnace body |
External interlayer insulation |
The outer low-temperature zone shall be filled only; contact with the crystal ingot or process chamber is strictly prohibited. |
Laminated insulation, joint sealing |
Customization, Quality Control, and Consulting
We can customize the dimensions, density, and porosity of carbon fiber hard felt, soft felt, and C/C composite materials according to customer drawings, meeting the non-standard thermal field requirements of various furnace types; each batch of products undergoes density, temperature resistance, and mechanical property testing before shipment to ensure batch consistency; if you require product selection recommendations or a quotation, please send us your drawings and operating condition parameters – we will complete the sampling and provide a quotation response within 7 working days.
