Avoidance of damage due to strength-reducing reactions in the preheating zone of tunnel kilns

» Flexural strength of a carbonaceous brickmaking material, type “C”, with and without chemical bonding agents C1, C2 and C3, as functions of heating temperature

1 Objective

Decomposition and transformation reactions taking place at temperatures between 500 and 800° C (900° C) provoke a loss of strength in brick green bodies. The purpose of these investigations, therefore, was to counteract such losses by means of raw-material measures and the use of inorganic binders of a type already employed in the refractories industry.

2 Background

Fluctuating temperatures and corresponding differences in expansion and shrinkage can cause stress-induced cracking. This can be countered by improving the stress tolerance of the nascent body.

3 Experimental procedure

This...

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Issue 04/2014

Causes and avoidance of firing-related damage Part 2: Strength-reducing reactions in the heating-up zone from 500 to 800° C

4 Expansion and shrinkage processes In a tunnel kiln firing process for heavy clay products, there should be no mutual contact between the wares to be fired, and all exposed surfaces within and around...

Issue 05/2013

Avoidance of damage due to strength-reducing reactions in the preheating zone of tunnel kilns

1 Objective

2 Background

3 Experimental procedure

Related articles:

Causes and avoidance of firing-related damage Part 2: Strength-reducing reactions in the heating-up zone from 500 to 800° C

Energy-saving methods of conditioning green brick bodies for low-temperature drying

Reduction of the thermal conductivity of brick bodies through fast firing

Influence of mineral additives on the drying and sintering behaviour of brick bodies, Part 2

Increasing brick body strength by adjusting the particle-size distribution

1 Objective

2 Background

3 Experimental procedure

ZI 6/2015

ZI 6/2015

Related articles:

Causes and avoidance of firing-related damage Part 2: Strength-reducing reactions in the heating-up zone from 500 to 800° C

Energy-saving methods of conditioning ­green brick bodies for low-temperature drying

Reduction of the thermal conductivity of brick bodies through fast firing

Influence of mineral additives on the drying and sintering behaviour of brick bodies, Part 2

Increasing brick body strength by adjusting the particle-size distribution

Energy-saving methods of conditioning green brick bodies for low-temperature drying