Refractories for Modern Ceramic Kilns

Refractory materials for ceramic kilns include ceramic kiln furniture and ceramic kiln body. Kiln furniture is a special-shaped refractory material that supports and protects the firing process of ceramic products and magnetic materials. It mainly includes saggers, shelves, pads, columns, and push plates. Most of the current ceramic kilns are ceramic tunnel kilns. It is necessary to use refractory materials of different materials as furnace linings for various parts of the tunnel kiln according to actual production conditions. Rongsheng Refractory Material Manufacturer can provide refractory materials for modern ceramic kilns. The product quality is reliable and the delivery speed is fast. Contact us for free samples and quotes.

Cordierite Mullite Kiln Furniture

Ceramic Tile Kiln Furniture

The performance of kiln furniture directly affects the quality and production cost of fired objects such as ceramics. Among them, cordierite-mullite materials are suitable for occasions with low temperatures, low working stress, and high thermal shock resistance. The shelves, columns, pads, etc. of low-temperature fast-firing kilns are often made of cordierite-mullite materials.

The biggest weakness of cordierite-mullite materials is insufficient high-temperature resistance, and the main cause of damage to its shelves is bending creep. The main way to increase the life of the shelves is to reduce the Na2O and CaO content in the material, increase the firmness of the bond between cordierite particles and the width of the "connecting bridge" between particles by improving sintering, and try to reduce bending stress. The main cause of damage to the pad is thermal shock creep. The measures to improve thermal shock resistance are to appropriately increase the content of cordierite and control the difference in physical properties between aggregates and substrates to form a suitable weak bonding interface or microcracks.

Silicon carbide materials are suitable for occasions where the temperature is not very high and high working stress, high thermal conductivity and high thermal shock resistance are required. Silicon carbide materials are divided into oxide-bonded, reaction-sintered and recrystallized silicon carbide materials and nitride-bonded. Oxide-bonded silicon carbide is a low- to medium-grade kiln furniture. The porosity of reaction-sintered silicon carbide is almost zero and it has high strength, but the use temperature should not be higher than 1350°C, which is very suitable for low-temperature fast-firing kilns. Recrystallized silicon carbide has good dimensional stability and high-temperature bearing capacity, and is suitable for occasions with temperatures above 1350°C. The use effect of chloride-bonded silicon carbide varies greatly depending on purity, mineral composition and microstructure. For example, silicon carbide materials bonded by high-purity, granular and dense silicon nitride-silicon oxynitride phases can generate dense and highly viscous surface glaze layers and internal protective layers that prevent oxidation during use, and thus have a satisfactory service life.

Mullite-corundum series materials are suitable for occasions with high calcination temperatures, such as firing alumina ceramics and ferrite ceramics.

Ceramic Kiln

Ceramic Kiln Lining Refractory

The inner wall material of the ceramic kiln wall is required to be resistant to high temperatures, and the type of refractory bricks selected is determined by the temperature of the product baking.

• 1) Use refractory clay bricks at temperatures below 1300℃.
• 2) Use high-alumina bricks at 1300-1400℃.
• 3) Use silica bricks at 1400-1500℃.
• 4) Use magnesia-alumina bricks at 1500-1600℃.
• 5) Use corundum bricks below 1800℃.

In order to reduce the heat dissipation of the kiln wall, lightweight insulation materials are built between the inner and outer walls of the kiln wall. Such as lightweight clay bricks, lightweight silica bricks, diatomaceous earth bricks, etc. The type and thickness of each layer of materials in each section of a kiln are determined according to the temperature of the section. After determining the kiln wall material and thickness, and the structure of the kiln, the materials required for the kiln wall can be estimated.

Therefore, refractory fiber blankets, felts, boards, paper and various folding products are widely used in masonry ceramic kiln linings and kiln cars. Although refractory fiber products have certain fire resistance and good thermal insulation, they are weak in resisting air scouring and chemical erosion by glaze condensate. After long-term use, the fiber will crystallize, powderize, and generate substances that may cause cancer. To overcome these weaknesses, the fiber blocks can be folded to improve the scouring resistance, and special coatings can be applied to the fiber surface or covered with refractory sheets. The carcinogenicity of refractory fibers can also be solved. The solution is to prepare and use coarse fibers or soluble fibers larger than 6μm. The powdered products of coarse fibers are difficult to fly away and are less likely to be inhaled. The powdered products can slowly dissolve after being inhaled, and are much less harmful.

Roongsheng New Energy Saving Insulation Materials

Requirements for Refractory Materials for Environmentally Friendly Tile Kilns

With the development of ceramic firing technology, new energy-saving tile kilns continue to emerge, and different parts of ceramic kilns have put forward new requirements for the performance of refractory materials.

Refractory bricks with good high-temperature mechanical properties and good thermal shock resistance are used as the skeleton of the kiln, such as kiln tools.

Insulating materials with good thermal insulation performance, such as refractory fibers, are used.

The kiln structure uses materials with both good high-temperature mechanical properties and good thermal insulation properties.

Energy saving is the theme of kiln development. The refractory materials used in new kilns have enhanced high-temperature resistance and thermal insulation. This simplifies the design and manufacture of kilns, which are a new type of refractory material. Rongsheng's new refractory insulation materials have better high-temperature performance and thermal insulation performance. Contact us for free samples and quotes.