Silicon Nitride Lift Tube

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Product Details

Technology:

1. Cold isostatic pressing

2. Machining

3. Reactive sintering / gas pressure sintering

Characteristic

1. High temperature resistance, corrosion resistance, no infiltration with nonferrous metal melt such as aluminum melt.

2. Excellent thermal conductivity, strong thermal shock resistance and no cracking.

3. Oxidation resistance and long service life

4. It can be customized according to customer requirements and specifications

Product Parameter

Property	Parameter
Density(g/cm3)	〉3.2g/cm3
Apparent Porosity(%)	〈0.3%
Rockwell Hardness(HRA)	〉93
Maximum Operating Temperature in air(℃)	1400
Maximum Operating Temperature in protective atmosphere(℃)	1800
Flexure Strength(MPa)	986(20℃)，485(1400℃)
Specific Heat Capacity（J/g ·K）	0.71
Poisson's Ratio (20℃)	0.290
Thermal Conductivity［W/(m·K)］	28.8
Thermal Diffusivity(300℃)/(cm2/s)	0.690
Electrical Resistivity(Ω·m)	1.4x105(20℃)，4x108(1050℃)

The lift tube in low pressure casting is one of the key components of low pressure casting machine. During die casting, aluminum melt (temperature 700 ~ 900 ℃) is pressed and sent from the lift tube to the mold cavity every 3 ~ 5 minutes. Steel lift tube is used in traditional manufacturing technique. Due to its poor thermal shock resistance, poor corrosion resistance, short service life and frequent replacement, it can not meet the requirements of continuous and high-quality production. Silicon nitride lift tube has become an ideal material for the preparation of lift tube because of its low thermal expansion, good thermal shock resistance and non aluminum adhesion