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Application of boron nitride in high temperature release agent
Time：
2025-11-28 22:46
1、 Lubricity of boron nitride
Boron nitride came out more than 100 years ago. Its earliest application polymorph is hexagonal boron nitride as a high-temperature lubricant, which is referred to as h-BN, or a-BN, or g-BN (graphite boron nitride). Hexagonal boron nitride is absolutely smooth, and the friction coefficient between powders is very low. Each layer of its atomic structure contains boron and nitrogen, and there is no B-N bond between the layers. Therefore, the planes slide between each other to obtain a soft and lubricating effect, It is very suitable for use as a high-temperature release agent.
In terms of application occasions or downstream product systems, there are generally the following:
Various optical glass film removers
Release agent for metal forming and lubricant for metal wire drawing
Metallurgical separation ring for continuous casting steel, etc.
Figure 1 Schematic diagram of BN atomic structure
2、 Advantages of boron nitride release agent
Good lubricity: special fine powder formulation, strong and effective adhesion to the mold surface, forming excellent lubrication effect.
It can prolong the life of the mold: effectively reduce the mold loss and reduce the time required to clean the mold. During the glass processing, it can minimize the surface defects of the glass products and make the glass easier to demould.
Good operability: with special spray formula, it can be evenly coated on the mold surface by hand (Figure 2).
High temperature resistance: excellent heat resistance and shock resistance. It will not break even if it is heated rapidly and cooled repeatedly at 1500 ℃. It can be used safely even if it is heated to 2200 ℃.
Fast drying speed: special quick-drying formula, fast drying speed, improve production efficiency and reduce costs.
Low friction coefficient: the friction coefficient u is only 0.16, which does not increase at high temperature. Compared with molybdenum disulfide, graphite is resistant to high temperature. The oxidation atmosphere can reach 800 ℃, and it can reach 2000 ℃ under vacuum.
Good corrosion resistance: it does not react with general metals (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salts (crystal stone, fluoride, slag), inorganic acids and alkalis.
Machinability: its Mohs hardness is 2, so it can be processed into parts with high precision by general machining methods
3、 Application of boron nitride release agent in glass mold release
With the rapid development of alcohol, food, beverage and other industries in China, the demand for all kinds of packaged glass bottles and cans has increased. The determinant bottle-making machine has become the mainstream model of glass bottle production and is widely used. The running speed of the determinant bottle-making machine is getting faster and faster, and the requirements for the lubricating release agent of glass mold are getting higher and higher. The traditional lubrication and demoulding method of glass mold adopts manual coating or mechanical spraying of animal and vegetable grease, which generally has poor effect.
The use of boron nitride lubricating material has significantly improved the lubrication and demoulding effect. At present, the widely used boron nitride release agents are mainly divided into the following three categories:
One is to use water as the medium, add high temperature adhesive and other additives to make water-based lubricant, and paint it on the surface of the mold at one time, and then use it after drying and film forming.
The other is to use oil as the medium and add additives to make an oily lubricant, which can be continuously brushed or sprayed during the operation of the determinant bottle-making machine.
A commonly used boron nitride release agent is made of boron nitride coated with high viscosity mineral oil and mixed with water under the action of emulsifier to make emulsified oil-type lubricating release agent for glass mold. When boron nitride ∶ oil ∶ water=1 ∶ 4 ∶ 10, and the amount of emulsifier is 7wt%, the emulsion oil release agent prepared has good stability, good release performance, and has the characteristics of thin oil film and uniform distribution. The use of boron nitride lubricating release agent improves the finished product rate of bottle making, reduces the consumption of lubricating release agent, and purifies the production environment.
The boron nitride release agent can also be applied to the processing of flat glass, which can greatly improve the working environment and product efficiency. Especially for bending glass processing, the effect is more remarkable:
Difficult Deep Bend
Heteromorphism
Thermal melting
Qingguang, etc.
4、 Application of Boron Nitride Release Agent in Melting and Welding of Metal Casting
Hexagonal boron nitride has excellent chemical stability, which can resist the neutron radiation of nuclear reactors. Acids and alkalis can not affect it. In an inert atmosphere (nitrogen or argon), the decomposition temperature is up to 2500 ℃, which shows excellent chemical stability under extreme conditions.
Hexagonal boron nitride can be made into boron nitride separation ring (Fig. 3) for horizontal continuous casting of steel. Hexagonal boron nitride is very stable to carbon and carbon monoxide at 1800 ℃, and it is also not subject to corrosion by molten glass, silicon, boron, non-oxide slag and molten salt (borax, cryolite) in steel.
Hexagonal boron nitride can be made into composite shell for casting titanium metal. The chemical stability of titanium metal is poor. When the forging is violently deformed at high temperature, the metal flow produces fresh surface, which is very easy to cause die sticking, resulting in the scrap of forgings and dies at the same time. The boron nitride release agent composite shell coating on the mold surface can avoid direct contact between titanium metal and the mold.
Hexagonal boron nitride can also be used in welding and furnace brazing processes, which can protect the workpiece surface from damage due to the spatter of welding slag, and also play a protective role in metal welding.
Boron nitride came out more than 100 years ago. Its earliest application polymorph is hexagonal boron nitride as a high-temperature lubricant, which is referred to as h-BN, or a-BN, or g-BN (graphite boron nitride). Hexagonal boron nitride is absolutely smooth, and the friction coefficient between powders is very low. Each layer of its atomic structure contains boron and nitrogen, and there is no B-N bond between the layers. Therefore, the planes slide between each other to obtain a soft and lubricating effect, It is very suitable for use as a high-temperature release agent.
In terms of application occasions or downstream product systems, there are generally the following:
Various optical glass film removers
Release agent for metal forming and lubricant for metal wire drawing
Metallurgical separation ring for continuous casting steel, etc.
Figure 1 Schematic diagram of BN atomic structure
2、 Advantages of boron nitride release agent
Good lubricity: special fine powder formulation, strong and effective adhesion to the mold surface, forming excellent lubrication effect.
It can prolong the life of the mold: effectively reduce the mold loss and reduce the time required to clean the mold. During the glass processing, it can minimize the surface defects of the glass products and make the glass easier to demould.
Good operability: with special spray formula, it can be evenly coated on the mold surface by hand (Figure 2).
High temperature resistance: excellent heat resistance and shock resistance. It will not break even if it is heated rapidly and cooled repeatedly at 1500 ℃. It can be used safely even if it is heated to 2200 ℃.
Fast drying speed: special quick-drying formula, fast drying speed, improve production efficiency and reduce costs.
Low friction coefficient: the friction coefficient u is only 0.16, which does not increase at high temperature. Compared with molybdenum disulfide, graphite is resistant to high temperature. The oxidation atmosphere can reach 800 ℃, and it can reach 2000 ℃ under vacuum.
Good corrosion resistance: it does not react with general metals (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salts (crystal stone, fluoride, slag), inorganic acids and alkalis.
Machinability: its Mohs hardness is 2, so it can be processed into parts with high precision by general machining methods
3、 Application of boron nitride release agent in glass mold release
With the rapid development of alcohol, food, beverage and other industries in China, the demand for all kinds of packaged glass bottles and cans has increased. The determinant bottle-making machine has become the mainstream model of glass bottle production and is widely used. The running speed of the determinant bottle-making machine is getting faster and faster, and the requirements for the lubricating release agent of glass mold are getting higher and higher. The traditional lubrication and demoulding method of glass mold adopts manual coating or mechanical spraying of animal and vegetable grease, which generally has poor effect.
The use of boron nitride lubricating material has significantly improved the lubrication and demoulding effect. At present, the widely used boron nitride release agents are mainly divided into the following three categories:
One is to use water as the medium, add high temperature adhesive and other additives to make water-based lubricant, and paint it on the surface of the mold at one time, and then use it after drying and film forming.
The other is to use oil as the medium and add additives to make an oily lubricant, which can be continuously brushed or sprayed during the operation of the determinant bottle-making machine.
A commonly used boron nitride release agent is made of boron nitride coated with high viscosity mineral oil and mixed with water under the action of emulsifier to make emulsified oil-type lubricating release agent for glass mold. When boron nitride ∶ oil ∶ water=1 ∶ 4 ∶ 10, and the amount of emulsifier is 7wt%, the emulsion oil release agent prepared has good stability, good release performance, and has the characteristics of thin oil film and uniform distribution. The use of boron nitride lubricating release agent improves the finished product rate of bottle making, reduces the consumption of lubricating release agent, and purifies the production environment.
The boron nitride release agent can also be applied to the processing of flat glass, which can greatly improve the working environment and product efficiency. Especially for bending glass processing, the effect is more remarkable:
Difficult Deep Bend
Heteromorphism
Thermal melting
Qingguang, etc.
4、 Application of Boron Nitride Release Agent in Melting and Welding of Metal Casting
Hexagonal boron nitride has excellent chemical stability, which can resist the neutron radiation of nuclear reactors. Acids and alkalis can not affect it. In an inert atmosphere (nitrogen or argon), the decomposition temperature is up to 2500 ℃, which shows excellent chemical stability under extreme conditions.
Hexagonal boron nitride can be made into boron nitride separation ring (Fig. 3) for horizontal continuous casting of steel. Hexagonal boron nitride is very stable to carbon and carbon monoxide at 1800 ℃, and it is also not subject to corrosion by molten glass, silicon, boron, non-oxide slag and molten salt (borax, cryolite) in steel.
Hexagonal boron nitride can be made into composite shell for casting titanium metal. The chemical stability of titanium metal is poor. When the forging is violently deformed at high temperature, the metal flow produces fresh surface, which is very easy to cause die sticking, resulting in the scrap of forgings and dies at the same time. The boron nitride release agent composite shell coating on the mold surface can avoid direct contact between titanium metal and the mold.
Hexagonal boron nitride can also be used in welding and furnace brazing processes, which can protect the workpiece surface from damage due to the spatter of welding slag, and also play a protective role in metal welding.
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