Refractory clay powder is a fundamental raw material widely used in the manufacture of refractory bricks, castables, mortars, and ceramic products. Known for its excellent plasticity, thermal stability, and chemical resistance, clay powder plays a critical role in shaping, bonding, and enhancing the performance of refractory materials used in high-temperature industrial environments.
(1)High strength
(2) Low water absorption rate
(3) Good resistance to wear
(4)Good weathering resistance
Clay powder is mainly used for refractory materials, such as amorphous refractory materials and refractory bricks. When the operating temperature of kilns or thermal equipment is low, it can also be used as refractory powder
|
Type |
Content（%） |
Refractoriness CN |
Bulk Density（g/cm3） |
Water Absorption （%） |
Impurity （%） |
|
|
Al2O3 |
Fe2O3 |
|||||
|
YNS-45 |
45~50 |
≤1.0 |
178 |
≥2.55 |
2.5 |
≤2.0 |
|
YNS-44 |
44~50 |
≤1.3 |
176 |
≥2.50 |
2.5 |
≤2.5 |
|
YNS-43 |
43~50 |
≤1.5 |
176 |
≥2.45 |
3.0 |
≤3.0 |
|
YNS-42 |
42~50 |
≤2.0 |
174 |
≥2.40 |
3.5 |
≤3.5 |
|
YNS-40 |
40~50 |
≤2.5 |
172 |
≥2.35 |
4.0 |
≤3.5 |
|
YNS-36 |
36~50 |
≤3.5 |
168 |
≥2.30 |
4.0 |
≤4.0 |
Refractory clay powder is a finely ground alumino-silicate material primarily composed of Al₂O₃ (alumina) and SiO₂ (silica). Unlike ordinary construction clay, refractory clay powder is specifically selected and processed to withstand high temperatures without losing mechanical strength or structural integrity.
Depending on the source and processing method, refractory clay powder typically contains:
Al₂O₃: 30–45%
SiO₂: 50–65%
Minor oxides such as Fe₂O₃, CaO, MgO in controlled amounts
Its refractoriness generally ranges between 1580°C and 1770°C, making it suitable for use in medium- to high-temperature furnace linings.
The production of high-quality refractory clay powder involves several controlled steps to ensure consistency and performance:
Only high-purity refractory clays with low alkali and iron content are selected, as impurities can significantly reduce refractoriness and thermal stability.
Some refractory clay powders are calcined to form chamotte, improving dimensional stability and reducing shrinkage during firing.
The raw or calcined clay is crushed and milled into fine powder, with particle size distribution carefully controlled to meet application requirements.
Particle size, chemical composition, plasticity index, and refractoriness are tested to ensure compliance with industrial standards.
Refractory clay powder maintains structural stability under prolonged exposure to high temperatures, typically up to 1600°C–1700°C, depending on alumina content and impurity levels.
One of the most important characteristics of clay powder is plasticity. It allows materials to be shaped easily during forming and provides excellent bonding between particles in unfired refractory products.
During firing, kaolinite in clay powder transforms into mullite, a crystalline phase that enhances high-temperature strength, creep resistance, and thermal stability.
Refractory clay powder exhibits good resistance to neutral and mildly acidic slags, making it suitable for many industrial furnace environments.
Refractory clay powder is not just a filler; it plays multiple functional roles:
Acts as a plastic binder in bricks and monolithic refractories
Improves green strength before firing
Enhances sintering behavior at high temperatures
Contributes to thermal shock resistance by forming stable ceramic bonds
Without properly graded clay powder, many refractory products would lack formability and long-term durability.
Used in fire clay bricks, mortars, and castables for blast furnaces, reheating furnaces, ladles, and soaking pits operating under moderate thermal and chemical stress.
Applied in kiln linings, preheater systems, and clinker coolers where abrasion resistance and thermal stability are required.
Used in furnace linings and auxiliary refractory components where resistance to alkali vapors and thermal cycling is essential.
Refractory clay powder is widely used in ceramic bodies, kiln furniture, and foundry molds due to its workability and firing stability.
While both materials are used in refractory manufacturing, their roles differ significantly:
Refractory clay powder offers better plasticity and shaping performance, making it ideal for forming processes. High alumina powder, with Al₂O₃ content above 70%, provides superior high-temperature strength and corrosion resistance but lower plasticity.
In practice, many refractory formulations use both materials together to balance workability and high-temperature performance.
Refractory clay powder is commonly added to:
Refractory mortars to improve bonding and workability
Low- and medium-duty castables to enhance cohesiveness and green strength
Proper particle size grading ensures uniform mixing, reduced segregation, and stable performance during installation and service.
To maintain quality:
Store clay powder in dry, well-ventilated conditions
Avoid moisture exposure to prevent caking and loss of plasticity
Use sealed packaging for long-term storage
Correct storage helps preserve consistency during mixing and application.
Refractory clay powder typically withstands temperatures between 1580°C and 1770°C, depending on alumina content and impurity levels.
Yes. It is widely used in steel furnace linings where moderate thermal and chemical resistance is required.
Yes. Clay powder improves workability, bonding, and green strength in many castable formulations.
Finer particles enhance plasticity and bonding, while coarser fractions help control shrinkage and improve dimensional stability.
Clay powder is a raw material providing plasticity and ceramic bonding, while refractory cement is a hydraulic binder that hardens through chemical reactions.
Yes. Mullite formation and controlled porosity help improve resistance to rapid temperature changes.
It offers good resistance to neutral and mildly acidic environments but is not suitable for highly basic slag conditions.
It should be stored in dry, sealed conditions to prevent moisture absorption and performance degradation.
Selecting the appropriate clay powder depends on:
Operating temperature
Chemical environment
Required plasticity
Compatibility with other refractory raw materials
At Highland Refractory, refractory clay powder is carefully processed and tested to ensure stable quality, consistent performance, and suitability for a wide range of industrial applications.
High alumina fine powder is a powder material with alumina (Al2O3) as the main component.
Refractory cement, also known as aluminate cement, is a fire-resistant hydraulic cementitious material.
High alumina fine powder is a powder material with alumina (Al2O3) as the main component.
Steel fiber wear-resistant castables are widely used in high temperature and wear-resistant environments in many industrial fields such as metallurgy, building materials, and chemicals.
White corundum castable is a high-quality high-temperature refractory material with high-purity alumina powder as the main raw material.
High aluminum castable refers to a refractory castable with Al2O3 content greater than 48%.
Lightweight insulation castable is a refractory with low density and excellent insulation properties.
Corundum mullite castable is a high-quality high-performance refractory material with high thermal conductivity, insulation, good chemical stability and resistance to reducing agents.
Silicon carbide castable is an amorphous refractory material with silicon carbide as the main component.
Chrome corundum castable is a high-performance amorphous refractory material composed of corundum and chromium. It has high melting point, high hardness, high stability and excellent slag resistance and wear resistance.
high alumina cement is a powder material with alumina (Al2O3) as the main component.
Plastic is an amorphous refractory material in the form of hard mud and has high plasticity.
Refractory spray coating is a kind of amorphous refractory material, which is applied to the lining of thermal equipment by spraying construction method.
Widely used in a variety of furnace front package, transfer package, ladle insulation layer...
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
