Although refractory clay and high temperature cement overlap in some application scenarios, they are significantly different in composition, performance and application scenarios. The following is a detailed comparison between the two:

I. Composition and formula

(1) refractory mud:

It is mainly composed of refractory powder, binder (such as plastic clay, phosphoric acid, aluminum dihydrogen phosphate, etc.) and admixture.

According to the fire resistance and application scenarios, it can be divided into clay, high aluminum, silicon, magnesium and other types.

The strength of ordinary refractory mud is low at room temperature, and the ceramic bond formed at high temperature has high strength.

(2) High temperature cement:

It is usually made of high-quality refractory powder, high-strength and temperature-resistant chemical binder and additives.

The formula may contain special binder and ultrafine powder to improve its performance at high temperature.

II. Performance characteristics

(1) refractory mud:

Fire resistance: Fire resistance is generally between 1580℃ and 1770℃.

Cohesion: the cohesiveness is average at room temperature, and the bonding strength is high after ceramic bonding is formed at high temperature.

Shrinkage: shrinkage is great at high temperature, and special binder is needed to improve the performance.

Construction: It has good plasticity and construction, and is suitable for building refractory bricks.

(2) High temperature cement:

Fire resistance: usually higher, up to more than 1650℃.

Adhesion: It has high adhesion strength at both high temperature and normal temperature.

Shrinkage: smaller shrinkage at high temperature, better volume stability.

Constructability: It is convenient for construction, and suitable for thin-layer coating and dipping construction.

III. Application scenarios

(1) refractory mud:

It is mainly used for gap filling of masonry refractory bricks to ensure the integrity and air tightness of masonry.

Widely used in industrial furnaces such as coke oven, glass furnace and blast furnace hot blast stove.

(2) High temperature cement:

In addition to building refractory bricks, it is also suitable for sealing high-temperature equipment, repairing furnace lining and bonding fiber materials.

It is especially suitable for occasions requiring small mortar joint, good sealing performance and high bonding strength.

IV. Operating temperature range

(1) refractory mud:

It is generally suitable for middle and low temperature areas (the highest use temperature is about 1500℃).

(2) High temperature cement:

Suitable for high temperature areas (the highest use temperature can reach 1800℃ and above).

V. Construction requirements

(1) refractory mud:

The consistency needs to be adjusted according to the requirements during construction, and water is usually needed to stir.

Suitable for building wide brick joints (4-6mm).

(2) High temperature cement:

It can be used directly during construction or the moisture can be adjusted as needed.

Suitable for thin-layer construction, which can reduce construction time and cost.

VI. Summary

The main difference between refractory clay and high temperature cement lies in composition, performance and application scenarios. Refractory clay is more suitable for building in middle and low temperature areas, while high temperature cement shows better performance in high temperature environment, which is suitable for higher temperature and more complicated working conditions.