Overview of Boron Nitride Ceramic Electrical Insulator for High Temperatures

Boron Nitride Ceramic Electrical Insulator for High Temperatures ceramics are a class of advanced technical ceramics, often referred to as “white graphite.” They are renowned for their unique combination of properties, including high thermal conductivity, excellent electrical insulation, and outstanding thermal shock resistance. Available in various forms such as hot-pressed solids, coatings, and composites, BN ceramics are critical in demanding applications across aerospace, electronics, and metallurgical industries.

Features of Boron Nitride Ceramic Electrical Insulator for High Temperatures

• High Thermal Conductivity: Offers excellent heat dissipation, similar to metals, while maintaining electrical insulation.

• Excellent Thermal Shock Resistance: Withstands extreme and rapid temperature changes without cracking.

• Superior Electrical Insulation: Maintains high resistivity even at elevated temperatures.

• Low Dielectric Constant and Loss: Ideal for high-frequency and microwave applications.

• Good Chemical Inertness: Resists attack from most molten metals, slags, and salts.

• Non-wetting and Non-reactive: With many molten metals like aluminum and copper.

• High Temperature Stability: Can be used in inert or vacuum atmospheres up to 3000°C.

• Machinability: Can be precision-machined into complex shapes using conventional tools, unlike many other advanced ceramics.

Specifications of Boron Nitride Ceramic Electrical Insulator for High Temperatures

Boron nitride ceramic electrical insulators handle extreme heat incredibly well. They work reliably in temperatures reaching 1000°C in air. Even hotter environments are possible under inert gas or vacuum. This material keeps its shape and strength under these tough conditions. It doesn’t soften or weaken like many plastics or other ceramics.

Electrical insulation is another key strength. Boron nitride blocks electricity flow very effectively. Its volume resistivity stays high even at those high temperatures. This makes it safe for demanding electrical applications. The dielectric strength is also strong, typically between 35 to 60 kV/mm. It prevents dangerous electrical arcing.

Thermal management is excellent too. Boron nitride moves heat away quickly. Its thermal conductivity is much better than alumina ceramic. This helps prevent dangerous hot spots. It also handles sudden temperature changes extremely well. Rapid heating or cooling usually won’t crack it. This thermal shock resistance is vital for repeated cycling.

The material is chemically stable and inert. It resists attack from most molten metals and salts. This is important in metal casting or semiconductor processing. Boron nitride is also easy to machine precisely. You can shape it into complex parts like rods, tubes, plates, or custom washers. Its smooth surface finish is often an advantage.

Typical specifications reflect these properties. Maximum continuous use temperature is 1000°C in oxidizing atmospheres. It can go higher, up to 1800°C, in vacuum or inert gas. Volume resistivity exceeds 10^14 ohm-cm even at 1000°C. Thermal conductivity ranges from 25 to 60 W/mK depending on grade and direction. The coefficient of thermal expansion is low. This contributes to the thermal shock resistance. Common applications include furnace fixtures, thermocouple protection tubes, crucibles, and high-voltage insulators.

Applications of Boron Nitride Ceramic Electrical Insulator for High Temperatures

Boron nitride ceramic electrical insulators handle extreme heat where others fail. This material is special. It keeps electricity safely contained even in very hot places. Regular insulators often melt or crack under intense heat. Boron nitride stays strong. It keeps working reliably.

Its structure makes it a great electrical barrier. Electricity doesn’t easily pass through it. This is vital for safety in high-power equipment. You need this insulation to prevent dangerous shorts or sparks. Boron nitride delivers this protection consistently at high temperatures. It won’t suddenly break down when things get hot.

Heat resistance is its biggest advantage. Boron nitride insulators work well past 1000 degrees Celsius in air. In inert gas or vacuum, they withstand even higher temperatures. This performance is far better than many common insulator materials. They simply can’t take that kind of constant heat. Boron nitride handles it.

These properties make it essential in demanding applications. Furnaces use boron nitride insulators around heating elements. They prevent electrical leakage in the intense heat. Semiconductor manufacturing relies on them inside high-temperature processing chambers. They insulate critical parts reliably. Aerospace and defense systems use them in components exposed to jet engine heat or rocket exhaust. Plasma equipment needs them to isolate electrodes in scorching plasma environments. They are also found protecting sensors taking measurements inside hot machinery. Boron nitride keeps the sensor signals clean and accurate.

The material is also easy to work with. You can machine boron nitride ceramic into precise shapes. This allows custom insulator designs for specific equipment needs. It handles thermal shock well. Rapid heating and cooling cycles don’t crack it easily. This toughness ensures long service life in tough conditions. Its smooth surface helps prevent sticking. Maintenance is simpler.

Company Profile

Tanki New Materials Co.Ltd. focus on the research and development, production and sales of ceramic products, serving the electronics, ceramics, chemical and other industries. Since its establishment in 2015, the company has been committed to providing customers with the best products and services, and has become a leader in the industry through continuous technological innovation and strict quality management.

Our products includes but not limited to Aerogel, Aluminum Nitride, Aluminum Oxide, Boron Carbide, Boron Nitride, Ceramic Crucible, Ceramic Fiber, Quartz Product, Refractory Material, Silicon Carbide, Silicon Nitride, ect. please feel free to contact us.

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5 FAQs of Boron Nitride Ceramic Electrical Insulator for High Temperatures

What temperatures can boron nitride insulators handle?
Boron nitride ceramic insulators work reliably up to 1000 degrees Celsius in air. They keep their strength and shape even at these extreme heats. Ordinary plastics or other ceramics often fail much sooner.

Does it insulate well when hot?
Yes. Boron nitride is an excellent electrical insulator, especially important at high temperatures. Its electrical resistance stays very high even when the part gets very hot. This stops dangerous electrical leaks or shorts in furnaces or high-power equipment.

Can it handle sudden temperature changes?
Absolutely. This material resists thermal shock extremely well. You can heat it rapidly or cool it down quickly. It won’t crack or break like many other ceramics might. This is vital for processes needing fast temperature shifts.

Is it chemically stable?
Yes, boron nitride is highly inert. It doesn’t react with most molten metals, salts, or corrosive gases. This protects the insulator from damage over time. It also helps keep electrical properties stable in harsh chemical environments.

Why choose boron nitride over alumina?
Boron nitride offers better performance in key areas. It handles higher temperatures without losing insulation. It resists thermal shock far better than alumina. Boron nitride also machines more easily into complex shapes. You pay more upfront, but it often lasts longer in demanding applications.