SiAlON Ceramics ( SiAlON ST )

McDanel Advanced Ceramic Technologies LLC SiAlON ST is an alloy of silicon nitride and aluminum oxide. This superior refractory material has the combined properties of silicon nitride (high strength, hardness, fracture toughness and low thermal expansion) and aluminum oxide (corrosion resistance, refractoriness and oxidation resistance). Traditional refractory products can be used only in high temperature applications where one or two of the following properties are required: thermal shock resistance, mechanical strength, corrosion resistance, abrasion resistance or electrical insulation. McDanel Advanced Ceramic Technologies LLC SiAlON ST combines high levels of these properties in one refractory material.

SiAlON ST is uniquely qualified for non-ferrous molten metal applications and high wear or high stress environments up to 1250°C. SiAlON ST is non-wetting for most non-ferrous metals. It is gas-tight, chemically inert, resistant to corrosion and features high strength, hardness and thermal shock resistance.

Grades and Applications of SiAlON Ceramics

Table 1. Grades and typical uses of SiAlON ceramics.

Grades

Typical Uses

SiAlON ST

Good for molten metal applications, high wear or high impact environments up to 1250°C. It is non-wetting for most nonferrous metals, gas tight, chemically inert, resistant to corrosion and metal attack and features high strength hardness and thermal shock resistance.

SiAlON BN

Good for molten steel applications up to 1500°C. It is a composite material combining SiAlON ST with increased thermal shock resistance and lubricity of Boron Nitride. It compromises porosity, hardness and strength to achieve higher temperatures and corrosion resistance.

Composition of SiAlON Ceramics

Table 2. Composition of McDanel Advanced Ceramic Technologies SiAlON.

Β – SiAlON

100%

Physical Properties of SiAlON Ceramics

Table 3. Physical properties of McDanel Advanced Ceramic Technologies SiAlON.

Property

SiAlON ST

Bulk Density

3.24g/cm3/202lb/ft3

Open Porosity

0%

Flexural Strength at 20°C

760MPa/110ksi

Flexural Strength at 1000°C

560MPa/80ksi

Compressive Strength

>3500MPa/>510ksi

Thermal Properties of SiAlON Ceramics

Table 4. Thermal properties of McDanel Advanced Ceramic Technologies SiAlON.

Property

SiAlON ST

Thermal Conductivity at 20°C

21W/m.K / 146BTU.in/ft2.hr.°F

Expansion Co-Efficient 20-1000°C

3x10-6/°C / 1.7x10-6/°F

Max Use Temp (no load)

1200°C/2192°F

Source: McDanel Advanced Ceramic Technologies

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