Hex Boron Nitride（ HBN) is chemically stable and has the advantages of non-toxicity, chemical stability, corrosion resistance, oxidation resistance, low humidity, biological stability and non-stick properties.Hex Boron Nitride does not react with general metals, rare earth metals, precious metals, semiconductor materials, glass, molten salts, inorganic acids, and alkalis. For most metal melts, such as steel, stainless steel, Al, Fe, Ge, Cu, Ni, Zn, etc., Hex Boron Nitride neither wets nor acts. Hex Boron Nitride is widely used as high temperature thermocouple protective sleeve, melting metal crucibles, utensils, pipelines for conveying liquid metal, pump parts, cast steel molds and high temperature electrical insulating materials. Hex Boron Nitride is insoluble in cold water, and hydrolyzes very slowly when water is boiled and produces a small amount of boric acid and ammonia gas. Hex Boron Nitride does not react with weak acids and strong bases at room temperature. Potassium oxide can be decomposed.
The Boron Nitride is divided into two specifications according to different grades, HBN-01 and HBN-02.The chemical composition of the product should meet the requirements in table 3 (mass fraction).
Hex Boron Nitride
Introduction
Hex Boron Nitride（ HBN) is chemically stable and has the advantages of non-toxicity, chemical stability, corrosion resistance, oxidation resistance, low humidity, biological stability and non-stick properties.Hex Boron Nitride does not react with general metals, rare earth metals, precious metals, semiconductor materials, glass, molten salts, inorganic acids, and alkalis. For most metal melts, such as steel, stainless steel, Al, Fe, Ge, Cu, Ni, Zn, etc., Hex Boron Nitride neither wets nor acts. Hex Boron Nitride is widely used as high temperature thermocouple protective sleeve, melting metal crucibles, utensils, pipelines for conveying liquid metal, pump parts, cast steel molds and high temperature electrical insulating materials. Hex Boron Nitride is insoluble in cold water, and hydrolyzes very slowly when water is boiled and produces a small amount of boric acid and ammonia gas. Hex Boron Nitride does not react with weak acids and strong bases at room temperature. Potassium oxide can be decomposed.
Table 1: Comparison of thermal properties of HBN and other materials.
Maximum use temperature /℃ | Thermal conductivity (w/m·k) | Thermal expansion coefficient /10-6/℃ | |
HBN | 900(O2) 2800(N2) | 25.1 | 0.7(ꓕ) 7.5(//) |
BeO | 2000 | 255.4 | 7.8 |
Al2O3 | 1750 | 25.1 | 8.6 |
Talc Porcelain | 1100 | 2.51 | 8.7 |
ZrO2 | 2000 | 2.09 | 10.0 |
Quartz glass | 130 | 1.67-4.19 | 6.5 |
Fluorine resin | 25 |
The table shows that Hex Boron Nitride has low thermal expansion coefficient and high thermal conductivity, and Hexagonal Boron Nitride Powder has excellent thermal shock resistance.
Table 2: Typical Specification of HBN
Typical Analysis | Specification |
HBN,% | 99.00min |
B2O3,% | 1.00max |
H2O,% | 0.5max |
Median Particle Size,μm | 0.50-0.80 |
The Hex Boron Nitride is divided into two specifications according to different grades, HBN-01 and HBN-02.The chemical composition of the product should meet the requirements in table 3 (mass fraction).
Table 3: Grade of Hexagonal Boron Nitride Powder.
Specifications | purity（wt.%） | B2O3（wt.%） | particle size（um） |
BNR-01 | ≥99 | ≤0.2 | 3-25 |
BNR-02 | ≥98.5 | ≤0.8 | 3-25 |
FIG.1 The crystal structure of Hex Boron Nitride.
FIG.2 Crucible made of Hexagonal Boron Nitride Powder.
On January 30, 2023, molybdenum price rose by more than 20% in a single day, breaking a new 17-year high. Molybdenum is known as the "war metal", "steel warrior". Molybdenum is valued by more and more countries. China is the world's richest country in molybdenum resources, with reserves of 4.3 million tons, followed by the United States (2.7 million tons) and Chile (1.8 million tons), which acco...more
