What is a Hot Pressing Boron Nitride Ceramic Strip Block?

 

Basic Definition & Production Principle

Hot Pressing Boron Nitride Ceramic Strip Block, referred to as HPBN Ceramic Strip Block, is a block-shaped and strip-shaped advanced ceramic product made of high-purity hexagonal boron nitride (h-BN) powder as the main raw material, supplemented by high-quality sintering aids, and processed by hot pressing sintering technology under high temperature and high pressure conditions. Different from the traditional ceramic production process, the hot pressing sintering technology integrates molding and sintering into one, which fundamentally solves the problems of low density, poor mechanical properties,ies and unstable performance of ordinary boron nitride ceramic products. Our product adheres to the principle of “high purity, high density, and high stability”, and selects 99.9% high-purity hexagonal boron nitride powder as the raw material, which effectively avoids the impact of impurities on product performance and lays a solid foundation for the excellent performance of the product.

The core production principle of our Hot Pressing Boron Nitride Ceramic Strip Block is to put the uniformly mixed high-purity boron nitride powder and sintering aids into a professional graphite mold, and then heat it to 1800-2200℃ while applying 20-50MPa pressure in a vacuum or inert gas environment. Hot pressing sintering, also known as pressure sintering, is a strengthening sintering method that completes pressing and sintering simultaneously, which can make the powder obtain a high-density product in a short time under lower pressure. Under the combined action of high temperature and high pressure, the powder particles undergo rapid diffusion, flow, and densification, forming a dense, uniform,m and high-performance ceramic structure. This production method not only shortens the production cycle by 30% compared with the traditional process, but also effectively inhibits the growth of crystal grains, ensuring the stability and consistency of product performance batch by batch. In addition, we use advanced automatic mixing and molding equipment to strictly control the mixing uniformity of raw materials and the precision of mold processing, so as to ensure that each batch of products meets the international export standards.

Core Characteristics Distinguished from Ordinary Ceramic Products

Compared with ordinary boron nitride ceramic strips and other types of advanced ceramics (such as alumina, zirconia ceramics), our Hot Pressing Boron Nitride Ceramic Strip Block has unique performance advantages, which are mainly reflected in the following aspects, and these advantages also make it have obvious competitiveness in the global market:

  • Higher density and mechanical strength: The hot pressing sintering process makes the product density reach more than 95% of the theoretical density, which is much higher than the 80% density of ordinary non-pressure sintered boron nitride ceramics, and the bending strength is significantly improved, which is not easy to breaking andeformationrm during use. The volume density of our product can reach ≥2.1g/cm³, and the bending strength is ≥150MPa, which is far higher than the industry average level.
  • More stable high-temperature resistance: It can maintain stable performance in a vacuum environment up to 2000℃, and can withstand high temperature up to 900℃ in an oxidizing atmosphere, which is far superior to ordinary ceramic materials that are easy to decompose and deform at high temperatures. This advantage enables our products to be used stably in high-temperature working environments such as metal smelting and high-temperature sintering, and effectively extends the service life of equipment.
  • Excellent electrical insulation and thermal conductivity: It has ultra-high volume resistance and breakdown voltage, the room temperature volume resistance is ≥10¹⁵Ω•cm, and the breakdown voltage is ≥30kV/mm. At the same time, the thermal conductivity in the horizontal direction can reach up to 300W/m·K, which can realize the dual functions of insulation and heat dissipation, solving the problem that most ceramics cannot have both. This characteristic is particularly important in the electronics field, which can effectively protect electronic components and improve their working efficiency.
  • Good corrosion resistance and non-stickiness: It has strong corrosion resistance to most acids, alkalis, and molten metals, and does not react with most materials at high temperatures. At the same time, it has excellent non-stickiness, which is not easy to adhere to molten metals, glass, ss and other materials, and is convenient for cleaning and maintenance, reducing the use cost of enterprises.


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