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Manufacturer of Light Unshaped Thermal Insulation Bricks

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Manufacturer of Light Unshaped Thermal Insulation Bricks

Date of release:2019-06-11 Author: Click:

I. Introduction

The structural strength of amorphous refractories depends on three bonding forces: (A) the bonding force of bonding phase itself; (B) the bonding force between bonding phase and aggregate phase; (C) the bonding force of aggregate phase particles themselves (crystalline phase and crystalline phase, crystalline phase and amorphous phase). If (A)<(B) and (C) are subjected to the maximum stress, the material will break through the bonding phase: if (B)<(A) and (C), the material will break along the bonding phase and the aggregate phase; if (C)<(A) and (B), the material will break through the aggregate particles. Insulation Brick Manufacturer

The amorphous refractories are generally composed of continuous bonding phases and discontinuous aggregate phases. Generally speaking, the strength of aggregate phase particles is larger than that of bonding phase. Therefore, the structural strength of amorphous refractories is controlled by bonding phase, that is to say, bonding agent is the main component to determine the structural strength of amorphous refractories.

2. Combination mode and mechanism

The bonds used in amorphous refractories can be divided into the following types according to their bonding modes: hydration bonding, chemical bonding, ceramic bonding, adhesion bonding and coagulation bonding.

(1) Hydration bonding: Calcium aluminate cement, Portland cement, and beta-Al2O3 are used as binders. Hydration bonding is produced by hydration reaction between binder and water at room temperature.

Water-bonded cementitious materials need a certain time for hydration reaction at room temperature, so they have a certain setting and hardening time. This kind of materials are mainly used as binders for refractory castables.

(2) Chemical bonding: Phosphate or phosphate (with or without hardener), sodium silicate or potassium silicate (with or without hardener), phenolic resin with hardener and so on. They combine with refractories (oxide aggregates), binders and hardeners by chemical reactions at room temperature or by chemical reactions during heating to form new compounds or by polymerization (condensation) crosslinking, so some of them also contain polymerization binding.

Chemical binders are mainly used as binders for refractory castables when hardeners are added, but not for ramming materials, plastics and coatings when hardeners are not added.

(3) Ceramic bonding: or low temperature sintering bonding, is to add additives or metal powders that can reduce sintering temperature in amorphous refractories to greatly reduce the temperature of liquid phase and promote solid-liquid reaction at low temperature to form low temperature sintering bonding. Some low temperature sintering additives used include borate, fluoride, boron and sodium. Glass, metal powder has SiAAlMMg powder.

Using sintering additives, aggregate particles are bonded together by viscous liquid phase at low temperatures of 500-1000 C. Then, with the increase of temperature, the high temperature chemical reaction between liquid and solid forms a bonding phase with higher melting temperature, resulting in strong bonding, such as adding a small amount of boron to corundum dry vibrating material. Anhydride and boric anhydride can melt at 577 ~C to form viscous liquid odor, and then react with a-Al2O3 to form compound 2Al2O3?2B2O3 (inconsistent melting temperature 1035 ~C) and 9Al2O3?2B2O3 (inconsistent melting temperature 1950 ~C) with higher melting temperature to consolidate corundum aggregates.

This kind of binder is mainly used as the binder of dry vibrating material. Dry vibrating material can be used as the lining of induction furnace, high temperature melting flume, container and so on.


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Key word:保温砖生产厂家,干式料厂家,铁沟料厂家

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