Reaction Bonded Silicon Carbide (SiSiC) Radiant Tube Assembly

Complete Three-Piece Heating Unit for Industrial Kiln Indirect Heating

Product Overview

This series of radiant tubes are manufactured from Reaction Bonded Silicon Carbide (RBSiC / SiSiC) high-temperature ceramics, specially developed for indirect gas heating in atmosphere kilns.The standard complete three-piece assembly consists of Flame Inner Tube (Combustion Guide Tube) + Outer Radiant Tube + Cross Support Spider. It is widely applicable to continuous and batch-type industrial heat treatment kilns.

Fuel burns hermetically inside the tube assembly, separating flue gas completely from workpieces inside the furnace. Leveraging silicon carbide’s outstanding thermal conductivity, heat is transferred outward via thermal radiation, effectively preventing oxidation, carburization and surface contamination of products. It serves as an ideal heating component for clean heat treatment, powder sintering and ceramic firing.

Complete Set Configuration

✅ Flame Inner Tube (Ribbed Guide Tube)Restrains flame propagation and disperses high-temperature flame core, avoiding local overheating and cracking of the outer tube caused by direct flame impingement. The segmented structure enables flexible splicing to match various furnace lengths and ensures stable and balanced combustion.

✅ Outer Radiant Tube (Two Options Available)▫️Smooth Straight Tube: Versatile and cost-effective, suitable for conventional temperature working conditions.▫️Enhanced Radiant Tube with Surface Bulges: External spherical bulges expand the heat radiation area, delivering higher thermal efficiency and superior temperature uniformity inside furnaces with remarkable energy-saving performance.

✅ Cross Support SpiderInstalled at the front end of the flame inner tube against the inner wall of the outer radiant tube. It maintains concentricity between inner and outer tubes to secure uniform clearance for flue gas recirculation. Meanwhile, it diverts and stabilizes flame shape to prevent flame deflection, as well as friction and collision between tubes, extending the service life of the whole radiant tube set.

Assembly Principle: Fit the cross support spider onto the tip of flame inner tube, then insert the inner tube assembly into the outer radiant tube. Flue gas recirculates and exchanges heat through the annular gap between the two tubes. Matched with self-recuperative burners to form a full heating unit.

Core Advantages of SiSiC Reaction Bonded Silicon Carbide

1. High thermal conductivity and excellent thermal radiation performance for fast heating and uniform heat distribution;

2. Superior thermal shock resistance, resistant to cracking under frequent startup-shutdown and temperature fluctuations;

3. High temperature strength and low creep, resisting sagging and deformation under long-term high temperature exposure;

4. Resistant to oxidation and corrosion in multiple atmospheres, chemically inert to powder materials and flue gas with zero metallic contamination;

5. Excellent gas tightness enables sealed combustion to isolate flue gas and guarantee finished product surface quality.

Typical Application Fields

Lithium cathode material roller kilns, magnetic material sintering kilns, ceramic tile tunnel kilns, powder metallurgy heat treatment furnaces, non-ferrous metal atmosphere annealing furnaces, enamel firing furnaces, shuttle kilns, pusher kilns and other equipment adopting indirect gas heating.

Reference Operating Parameters

Max continuous working temperature: ≤1350℃Applicable fuels: Natural gas, LPG, town gasCompatible combustion system: Single-ended self-recuperative straight radiant tube system

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