High Purity Boron Nitride Ceramic Ring

High purity boron nitride ceramic rings are advanced engineering components primarily made from sintered boron nitride ceramic, often with a hexagonal crystal structure (hbn ceramic). These boron nitride ceramics are known for their exceptional thermal and chemical stability, exhibiting properties similar to graphite but with superior electrical insulation (boron nitride insulator) and higher temperature resistance. A key characteristic is the impressive thermal conductivity of boron nitride (bn thermal conductivity), which, combined with excellent electrical insulation, makes them unique. Common commercial grades include materials from manufacturers like Momentive boron nitride (boron nitride momentive).

They are typically white or ivory and are manufactured through processes like hot pressed boron nitride or chemical vapor deposition (CVD) to create forms such as pyrolytic boron nitride (pbn, pyrolytic boron nitride pbn), which results in a highly pure and anisotropic pbn compound. This versatility in manufacturing allows the production of various shapes, including boron nitride ceramic rings, boron nitride tubes, boron nitride plates (boron nitride plate), and boron nitride sheets (boron nitride sheet, bn sheet, boron nitride ceramic sheet).

• High thermal conductivity (thermal conductivity of bn, h bn thermal conductivity, hexagonal boron nitride thermal conductivity, boron nitride ceramic thermal conductivity) with excellent electrical insulation.
• Outstanding thermal shock resistance and stability at extreme temperatures (up to 3000°C in inert atmospheres).
• Low coefficient of friction and self-lubricating characteristics.
• Chemically inert to most molten metals, acids, and alkalis.
• High dielectric strength and low dielectric loss.
• Non-toxic and machinable boron nitride, allowing boron nitride machining of ceramic boron nitride (boron ceramic, boron ceramics) into precise shapes. Pbn coating is also applied via the pyrolytic process for specific surface enhancements.

• Semiconductor and Electronics Industry: Used as crucibles, insulators, diffusion sources, and substrates (often utilizing pyrolytic boron nitride).
• Metallurgy and Foundry: Serving as components for molten metal containment, thermocouple protection tubes, and release agents.
• Aerospace and Nuclear Fields: Employed in high-temperature insulation, neutron absorption, and structural parts.
• Plasma and CVD Systems: Acting as liners, heaters, and substrates due to plasma resistance (frequently using pbn components or coatings).
• Industrial Equipment: Utilized in high-temperature bearings, seals, and electrical insulating components, where forms like boron nitride sheets and plates are common.

Hexagonal boron nitride is a material with excellent performance and wide application, but due to its flaky microstructure and stable chemical properties, sintering is very difficult, and it is difficult to obtain a dense ceramic block through existing sintering processes. In the past, hexagonal boron nitride ceramics often improved their performance by adding a large number of sintering aids, but the presence of sintering aids will have a great impact on the performance of hexagonal boron nitride ceramics, seriously hindering the application of boron nitride ceramics.
Superior Ceramics Times' high-purity and high-performance boron nitride ceramic material technology fills the domestic gap. It adopts phase change pressurized sintering technology to achieve self-densification of boron nitride ceramics, that is, when nano-scale cubic boron nitride undergoes a phase change to hexagonal boron nitride at high temperature, it can effectively promote the sintering of hexagonal boron nitride ceramics, and achieve low-temperature sintering without adding sintering aids, and obtain high-purity, high-density, and high-performance hexagonal boron nitride ceramic materials.
This material can be used as boron nitride ceramic nozzles, ceramic rings, etc. for semiconductors, which have been used in Europe, the United States, and Japan.

The performance data of boron nitride ceramic samples, the specific results are as follows:
1. Phase detection:

The sample only detected the diffraction peaks corresponding to the six mirror planes of hBN (002), (100), etc., and did not detect the diffraction peaks of cBN at 43°, 50°, and 74°, indicating that all cBN raw materials have been transformed into hexagonal phase during the sintering process, and no impurity phase exists.
2. Density detection:

The relative density of the sample increases significantly with the increase of cBNd content, reaching a maximum value of 97.6% at 30wt%, which is much higher than the previously reported density of boron nitride ceramics.

3. Mechanical properties:

High-performance hexagonal boron nitride ceramics have 2-3 times the compressive strength and flexural strength of ordinary hBN ceramics, which are much greater than Young's modulus and microhardness of ordinary hBN ceramics. And with the increase of cBN addition, the strength of high-performance hexagonal boron nitride ceramics continues to increase. Its flexural strength and compressive strength are as high as 94.51MPa and 118.67MPa, and Young's modulus and microhardness are 29.44 and 1.15GPa respectively.
4. Dielectric properties:
The prepared high-performance hexagonal boron nitride ceramics have a lower dielectric constant and significantly reduced dielectric loss. With the addition of cBN, the dielectric constant decreases slightly and the dielectric loss also decreases. The optimal dielectric constant is 4.37, and the dielectric loss is as low as 2.48×10-4.

Dielectric constant and dielectric loss of samples with different cBN additions

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