Hexagonal Boron Nitride Ceramic Tube BN Hollow Cylinder

BN tube Advantage

Low outgassing under high‑temperature vacuum

Stable insulation performance even at continuous high‑temperature service

Resists rapid heating‑cooling cycles, not easy to crack

2). Vacuum Furnace / High‑Temperature Heat‑Treatment Furnace

3). Metallurgy & Molten Metal Processing

HBN tube Specification

Shape Options:

1.Through‑hole hollow cylinder bushing

2.Recessed cavity with bottom drain‑out small hole

Custom Service:

Customized outer diameter, height, cavity depth according to drawings

热导率（室温）

Thermal Conductivity (RT)

45-50W/(m·K)

热膨胀系数（25-700℃）

Thermal expansivity (25-700℃)

6.5-7.5  10^-6/℃

电阻率（室温）

Resistivity (RT)

>10¹² Ω·cm

击穿电压

Puncture voltage

2.5-4.0 10⁶/kv·m

莫氏硬度

Mohs' hardness

2

电介常数 (Σ)

Dielectric constant (Σ)

3.8-4.3

抗弯强度（室温）

Bending strength (RT)

>35 MPa

抗压强度（室温）

Compression strength (RT)

>200 MPa

密度

Density

1.9-2.2 g/cm³

化学成分

Chemical Composition

氮化硼

B+N

99.5 %

氧含量

Oxygen Content

<0.4 %

碳含量

Carbon Content

<0.05 %

工作环境温度

Working Environment Temperature

氧化环境

Oxidizing Atmosphere

900 ℃

真空

Vacuum

≥2200 ℃

惰性环境

Inertia

≥2200℃