Introduction of Refractories

I.Refractory classification:

There are many varieties of refractory materials and different uses. It is necessary to scientifically classify refractory materials for scientific research, rational selection and management. There are many methods for classification of refractory materials, including chemical property classification, chemical mineral composition classification, production process classification, and material morphology classification.

I).According to the level of refractoriness:

Ordinary refractory material: 1580 ° C ~ 1770 ° C

Advanced refractory: 1770 ° C ~ 2000 ° C

Premium refractory: >2000°C

II). According to the shape and size of the product:

Standard type: 230mm × 114mm × 65mm;

No more than 4 scales, (size ratio) Max: Min<4:1;

Shape: no more than 2 concave corners, (size ratio) Max: Min<6:1;

Or have an acute angle of 50 to 70 °;

Specific type: (size ratio) Max: Min<8:1;

Or no more than 4 concave corners; or an acute angle of 30 to 50°;

Special products: enamel, utensils, tubes, etc.

III).According to the manufacturing method refractory materials can be divided into:

Burned products, non-fired products, unshaped refractories.

IV).Classified by material chemical properties:

Acid refractory, neutral refractory, basic refractory

V).Classification by chemical mineral composition

This classification method can directly characterize the basic composition and characteristics of various refractory materials, and is a common classification method in production, use and scientific research, and has strong practical application significance.

Siliceous (silica)

Aluminum silicate


Magnesium, magnesia, magnesia, magnesium silice

Carbon composite refractory

Zirconium refractory

Special refractory

VI).Unshaped refractory classification (classified according to usage)

Castable,Spray coating,Smashing,Plastic,Pressing material,Projection material,Spreading material

Dry vibrating material,Self-flowing castable,Refractory mud

II.Refractory properties

Physical properties of refractory materials include structural properties, thermal properties, mechanical properties, performance properties, and work ability.

The structural properties of the refractory include porosity, bulk density, water absorption, gas permeability, pore size distribution, and the like.

The thermal properties of refractory materials include thermal conductivity, coefficient of thermal expansion, specific heat, heat capacity, temperature coefficient, thermal emissivity, and the like.

The mechanical properties of the refractory include compressive strength, tensile strength, flexural strength, torsional strength, shear strength, impact strength, wear resistance, creep, bond strength, modulus of elasticity, and the like.

The refractory properties include refractoriness, load softening temperature, re-firing line change, thermal shock resistance, slag resistance, acid resistance, alkali resistance, hydration resistance, CO corrosion resistance, electrical conductivity, oxidation resistance Wait.

Zhengzhou YuXin Kiln Engineering Co.,Ltd is one of leading manufacturers and distributors of high quality refractories for use in industries including steel plants, cement producers and glass works.

We provide not only the domestic and foreign customers excellent quality of high-temperature thermal insulation material, but also the first-rate service including professional furnace lining design, installation supervision, engineering construction etc.