Oxide-Bonded Silicon Carbide Refractory Products

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Insulation and Refractory Materials

Oxide-Bonded Sic Products (1)
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Oxide-Bonded Sic Products (1)
Oxide-Bonded Sic Products (2)
Oxide-Bonded Sic Products (3)
Oxide-Bonded Sic Products (4)
Oxide-Bonded SiC Products Manufacturer & Supplier

Laurel Oxide-Bonded SiC Products are high-temperature silicon carbide components manufactured by bonding silicon carbide grains with an oxide-based bonding phase. The combination provides a practical balance of thermal shock resistance, high-temperature strength, oxidation resistance, thermal conductivity, and dimensional stability.

Oxide-bonded silicon carbide is widely used for kiln shelves, setter plates, batts, support components, beams, saggers, and other custom kiln furniture where repeated heating and cooling, mechanical loading, and exposure to high temperatures are required.

Compared with conventional cordierite or mullite kiln furniture, silicon carbide products can provide higher thermal conductivity and lower thermal expansion, allowing thinner structural designs in suitable applications. This can reduce the thermal mass of kiln furniture and help improve heating and cooling efficiency. Public technical data for silicon carbide kiln furniture confirms that its low thermal expansion and good high-temperature strength are important advantages in repeated firing operations.


Product Details






Oxide-bonded silicon carbide is a type of SiC refractory material in which silicon carbide particles are joined through an oxide-based bonding phase. Silicon carbide provides the main high-temperature and thermal properties, while the bonding phase determines important characteristics such as oxidation behavior, strength, porosity, and maximum practical service temperature.

The manufacturing process normally includes SiC raw material preparation, particle grading, mixing with the bonding components, forming, drying, and controlled firing. The exact formulation and firing schedule depend on the required product shape and performance.

This material is particularly suitable for kiln furniture because SiC has a relatively low coefficient of thermal expansion and high thermal conductivity. These characteristics help reduce thermal gradients during firing and cooling, which is important when kiln furniture is repeatedly exposed to thermal cycles.

Oxide-Bonded SiC Material Properties

The performance of an oxide-bonded SiC product is determined by both the silicon carbide aggregate and the bonding phase.

Typical characteristics include:

1.High silicon carbide content

2.Good thermal conductivity

3.Low thermal expansion

4.Good thermal shock resistance

5.High-temperature dimensional stability

6.Good resistance to oxidation

7.Good resistance to wear

8.Suitable mechanical strength at elevated temperatures

9.Relatively low thermal mass compared with some traditional refractory kiln furniture

Representative published data for oxide-bonded SiC shows a bulk density around 2.7 g/cm³, thermal conductivity around 15 W/m·K, coefficient of thermal expansion around 4.5 × 10⁻⁶/K, and bending strength around 35 MPa, although values vary according to grade and manufacturer.


Table parameters

Item


OXSIC 

Chemical Analysis

SiC

(%)

85-90

Fe2O3

(%)

<0.4

Bulk Density

(g/cm3)

2.5-2.7

Open Porosity

(%)

15-17

Cold Crushing Strength

(Mpa)

>80

Modules of Rupture at 1300 ℃

(Mpa)

>56

Coefficient of Thermal Expansion(25-1300℃)


4.7 x 10-6

Refractoriness Under Load of 0.3Mpa

(℃)

>1700

Max. Working Temperature

(℃)

1400

Thermal Conductivity at 1200℃

(Kcal/m.h. ℃)

14.0

PropertyTypical Reference Value
MaterialOxide-Bonded SiC
SiC ContentTypically 80–90% depending on grade
Bulk DensityApprox. 2.6–2.75 g/cm³
Apparent PorosityApprox. 8–18%
Thermal ConductivityApprox. 15–30 W/m·K
Coefficient of Thermal ExpansionApprox. 4.5–4.9 × 10⁻⁶/K
Bending StrengthApprox. 35–50 MPa
Maximum Use TemperatureTypically about 1400–1600°C, depending on grade and conditions


Features

Published oxide-bonded SiC data varies significantly between formulations. For example, one manufacturer reports 90% SiC, 2.70–2.75 g/cm³ bulk density, 7–8% apparent porosity and 50 MPa modulus of rupture, with a maximum application temperature of 1550°C. Another technical datasheet lists oxide-bonded SiC at approximately 1400°C, showing why the actual grade and operating atmosphere should be specified when selecting the material.

Oxide-Bonded SiC Kiln Furniture

One of the main applications of Oxide-Bonded SiC Products is kiln furniture for ceramic firing.

Available configurations can include:

  • SiC kiln shelves

  • SiC batts

  • Setter plates

  • Support plates

  • Posts and props

  • Beams

  • Saggers

  • Custom-shaped kiln components

The geometry can be designed according to the ware dimensions, kiln loading arrangement, firing temperature, load distribution, and required support span.

For large or heavy ceramic products, the thickness and support spacing of the kiln furniture are particularly important. Excessive span can cause high bending stress and permanent deformation during repeated firing. In practical use, the correct design is therefore more important than simply selecting the highest-strength material.

Installation and Handling of Oxide-Bonded SiC Products

Correct handling has a significant effect on the service life of kiln furniture.

New kiln furniture should be inspected for cracks, chipped edges, warping, and other transportation damage before installation.

Moisture is another important consideration. A technical datasheet from IPS specifically warns that kiln furniture can absorb water during manufacturing, transport, or storage and should be dried before use; trapped moisture can cause cracking when rapidly heated above approximately 100°C.

During installation:

  • Do not drag shelves across support posts.

  • Avoid point loading at corners.

  • Keep support positions consistent.

  • Avoid direct flame impingement where applicable.

  • Ensure shelves are adequately supported.

  • Do not install visibly cracked components.

  • Follow a controlled initial heating procedure for new or moisture-exposed furniture.

These simple practices can significantly reduce premature cracking and edge damage.


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