GR0189 Graphite Heater

Graphite Heater Description

Graphite heaters are electrical heating elements manufactured from graphite material that meets strict quality standards. Given that they exhibit high electrical and thermal conductivity, graphite heaters are frequently employed in specialised industrial furnaces as heating elements. Graphite demonstrates significant high‐temperature strength; its strength at normal temperatures is lower than that of metals, but it increases with rising temperature and eventually exceeds the strength of many oxides and metals. Moreover, graphite exhibits characteristics of both metals and ceramics, including good electrical and thermal conductivity as well as a low coefficient of thermal expansion, which contributes to its resistance against temperature variations.

Specifications of the Graphite Heater

Advantages of Graphite Heaters

• Low wettability with molten metals
• Fine-grained composition
• Elevated density
• Uniform microstructure
• High mechanical strength
• Reliable thermal conductivity

Graphite Heater Application

In industrial furnaces, the graphite heater must generate a stable heat field. Consequently, the graphite is required to be homogeneous and maintain a stable electrical resistance. Initially, the graphite electrode served as the heating element in early industrial furnaces and was later employed as a heater element owing to its density and performance (for example, in the melting of quartz glass, the graphite electrode was used as the heating element). With the progression of the semiconductor industry and the refinement of materials such as silicon, single-crystal germanium, gallium, indium and others, high-purity graphite with a fine structure and uniform composition was used as a graphite heater in furnaces. In certain specialised industrial and experimental furnaces, carbon or graphite fabric has been utilised as the heating body.

Frequently Asked Questions (FAQs)

1. What advantages does a graphite heater offer compared to conventional heating elements?

Graphite heaters provide defined thermal and electrical conductivity, significant high-temperature strength and measured thermal shock resistance. They enable uniform heat distribution and tend to have an extended operational lifespan, particularly in applications with marked temperature fluctuations.

2. In which industries are graphite heaters primarily applied?

Graphite heaters are primarily used in metallurgy, glass manufacturing, the semiconductor industry, chemical processes, research and development environments, as well as in specialised industrial furnaces where precise temperature control and high temperature endurance are required.

3. How is the lifespan of a graphite heater maximised?

The operational life of a graphite heater is maximised by operating within the recommended temperature and load boundaries, conducting regular maintenance and inspection, and avoiding abrupt temperature changes. Proper installation and handling are essential to maintain an extended lifespan.

4. Are graphite heaters available in different sizes and shapes?

Yes, graphite heaters are available in a range of sizes, shapes and specifications to meet the varying requirements of different industries. Customised solutions may be developed upon request.

5. How is a graphite heater installed in an industrial furnace?

The installation of a graphite heater requires careful planning and precise handling. It is important to ensure that the electrical connections are correctly established and that the heater is securely installed within the furnace to guarantee uniform heat distribution. Technical experts are available to provide assistance and guidance to ensure a proper installation.