Horizontal graphite vacuum furnace assists in high-temperature sintering of silicon carbide at a company in Taizhou, Zhejiang Province.

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Horizontal graphite vacuum furnace assists in high-temperature sintering of silicon carbide at a company in Taizhou, Zhejiang Province.

1. Client Introduction

Client Name: A company in Taizhou, Zhejiang Province (Advanced ceramics and powder metallurgy professional manufacturer)

Industry: Special ceramics, powder metallurgy, carbon and graphite products

Core Needs: To achieve high-density sintering of silicon carbide (SiC) ceramic products in a high-temperature vacuum environment, while simultaneously meeting the vacuum heat treatment requirements of various materials such as refractory metal compounds, carbon and graphite products, and ceramic materials.

This company, located in Taizhou, Zhejiang Province, has long been engaged in the research and development and production of silicon carbide bulletproof ceramics, silicon carbide sealing components, silicon carbide heat exchange tubes, and powder metallurgy refractory metal products. The silicon carbide sintering process requires a furnace temperature of over 1700℃, and must be conducted in a high vacuum or protective atmosphere to prevent oxidation and promote grain growth and densification. Traditional molybdenum wire furnaces or resistance furnaces are difficult to stably reach 1800℃ and operate long-term. The client needs a large-scale graphite vacuum sintering furnace capable of handling large-sized workpieces, featuring convenient double-door loading and unloading, and capable of long-term stable operation under high-temperature vacuum.

2. Equipment Introduction

Equipment Name: Graphite Vacuum Furnace (Horizontal Double-Door Structure)
Model: PT-VS1800-936CWD
Operating Temperature: ≤1800℃ (Common Sintering Temperature: 1600～1750℃)
Furnace Structure: Horizontal steel structure furnace body, sturdy and durable, stable thermal field
Furnace Door Type: Double-door opening on both sides – front and rear or left and right double-door design, combined with material carts, to realize assembly line operation of workpieces being loaded from one end and removed from the other end, greatly improving loading and unloading efficiency
Heating Element: High-purity graphite heating element (plate/rod/cylindrical), high temperature resistant, rapid heating
Insulation Layer: Multi-layer graphite felt + carbon fiber composite hard felt, low heat loss, low surface temperature
Vacuum System: Mechanical pump + Roots pump/diffusion pump combination, ultimate vacuum degree can reach 5×10⁻³ Pa (depending on configuration)
Water Cooling System: The furnace shell, electrodes, vacuum flanges, etc., are all equipped with water-cooled jackets to ensure long-term stability of the seals and furnace body at high temperatures.
Electrical Control: PLC + touch screen, PID programmable temperature control, capable of storing multiple sintering curves, multiple alarms for over-temperature, water shortage, and under-voltage.
Material Cart System: Electric or manual material carts, working with double doors, for convenient and safe loading and unloading, capable of carrying heavy workpieces.
Safety Features: Furnace pressure interlock, hydrogen/atmosphere safety interlock (e.g., process gas supply), water pressure undercurrent protection, overcurrent protection.

This horizontal graphite vacuum furnace is designed for high-volume, high-temperature vacuum sintering of silicon carbide, carbon/carbon composites, graphite products, and refractory metal compounds. The double-door + material cart configuration allows it to be integrated into semi-continuous production lines, significantly improving production efficiency.

3. Equipment Application

Specific Process: Silicon Carbide (SiC) Sintering (Pressureless Sintering/Reaction Sintering)

Also Applicable to:

Refractory metal compound powder metallurgy materials (e.g., tungsten carbide WC, titanium carbide TiC, zirconium diboride ZrB₂).

Carbon and graphite products (graphite crucibles, graphite electrodes, carbon/carbon composites).

Vacuum/atmosphere sintering of ceramic materials (silicon nitride Si₃N₄, alumina Al₂O₃, zirconium oxide ZrO₂, etc.).

Silicon Carbide Sintering Mechanism: Under high-temperature vacuum or inert atmosphere, SiC particles achieve densification through solid-phase diffusion or liquid-phase assistance (addition of B, C, etc.), obtaining ceramic products with near-theoretical density.

4. Customer Feedback

"We chose this horizontal graphite vacuum furnace primarily because of its sintering capacity of 1800℃ and its double-door material cart design. With the significant increase in ceramic density, the performance has improved dramatically. What our workshop workers appreciate most is the double-door design—the green blanks are pushed in from the left side and pulled out from the right after sintering, completely avoiding interference with the loading and unloading areas. The furnace door seals very well, and it only takes 20 minutes to reach a vacuum of 10⁻² Pa. Overall maintenance costs are low. The water-cooling system is also well-designed, keeping the furnace exterior temperature below 45℃, ensuring safety and energy efficiency. This furnace is already our main sintering equipment, and we will be importing more of the same model in the future."

— A company in Taizhou, Zhejiang

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Horizontal graphite vacuum furnace assists in high-temperature sintering of silicon carbide at a company in Taizhou, Zhejiang Province.

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