Silicon nitride (Si₃N₄) Liquid Heating Element consists of heating tungsten wire, power supply leads and flat silicon nitride (Si₃N₄) ceramic substrate. The heating tungsten wire is placed in silicon nitride powder raw material, from which the substrate is formed after hot pressing and sintering. The power supply leads connect the heating tungsten wire to power supply. High performance silicon nitride (Si₃N₄) is both electric insulator and heat transfer medium, which can be directly contact with water (or other liquid being heated), resulting high heating efficiency, safe and energy saving.

This product has the following excellent performance and features:

• High electric insulation strength: No breakdown for 1 minute, at 2500V, 50Hz, and room temperature

• Current leakage: normal operation ≤ 0.025 mA, when broken in the water, ≤ 10 mA

• High application temperature: maximum 1200 ⁰C in air

• High power at unit surface, up to 25 W/cm²

• Small thermal inertia and fast heating

• Acid corrosion resistance: when boiling in 5% sulphuric acid solution for 6h, the corrosion rate <10 g/(m^2∙h)

• Alkali corrosion resistance: when boiling in 30% sodium hydroxide solution for 6h, the corrosion rate <0.6 g/(m^2∙h)

• Small size

• Long life: 500 

No.

Properties & Specification

Value

1

Density (g/cm³)

3.2 ‒ 3.4

2

Flexural Strength (MPa)

900

3

Fracture Toughness (MPa∙m^1/2)

6 ‒ 8

4

Hardness (HRA)

92 ‒ 94

5

Thermal Conductivity (W∙m^-1∙K^-1)

23 ‒ 25

6

Coefficient of Thermal Expansion (K^-1)

3.1 x 10^-6

7

Electric Resistivity (Ω∙cm)

10¹⁴

8

Dielectric Constant

6 ‒ 7

9

Rated Voltage (V) (50/60Hz)

110 ‒ 380

10

Power Frequency (Hz)

50 / 60

11

Rated Power (W)

500 ‒ 3000