Boron Nitride cbn is an advanced ceramic known for its superior properties. BN chemistry has ホウ素窒素 bonds that give rise to different structures. Of the structures of BN one such prominent structure of interest is Cubic Boron Nitride cbn. Let us try to understand c-bn and its relative aspects.
Table of Contents
- What is cubic Boron Nitride?
- Structure of Cubic Boron Nitride
- 立方晶窒化ホウ素の特性
- 立方晶窒化ホウ素対ダイヤモンド
- 立方晶窒化ホウ素の用途
- Super abrasive wheels – or diamond c-BN wheel
窒化ホウ素: An Overview
窒化ホウ素 is indicated by chemical formula “BN.” As earlier mentioned, 窒化ホウ素 exist in different forms. Generally, it is the location of Boron and Nitrogen in lattice that creates various Boron Nitride structures. Some of them are quiet famous such as amorphous, hexagonal, cubic and Wurtzite.
When it comes to functionality, Boron Nitride ceramic is highly machinable. Once machined they does not really require any heat sintering or treatment for stabilization. In addition, 窒化ホウ素 has higher heat capacity and is also a good electrical insulator.
For now, let’s try to understand derivatives of BN, 六方晶窒化ホウ素（h-BN） and another 立方晶窒化ホウ素（c-BN）
六方晶窒化ホウ素（h-BN）
Structure of Hexagonal Boron Nitride
六方晶窒化ホウ素 is a constituent in many industrial products such as cosmetics. HBN has a structure controlled by covalent bonds. However, the layers in HBN obey wander Waals forces. The plate like geometry of HBN is the reason why it is ideal for lubrication.
六方晶窒化ホウ素 has elements of Boron and Nitrogen fixed to its lattice. The arrangement has three nitrogen atoms attached to a Boron Atom. The similarity in the honeycomb structure is the reason for its analogy with carbon. In addition to, properties of mechanical, chemical strength and electrical insulation are due to the planar triangular bonds
Properties of Hexagonal Boron Nitride
六方晶窒化ホウ素 is popularly manufactured through Boric Oxide nitridation at elevated temperatures. Since its stability is closer to graphene, 六方晶窒化ホウ素 is often acclaimed as the most advanced technical ceramic. Some superior properties of 六方晶窒化ホウ素 熱伝導性と摩擦係数の低さが特徴です。
六方晶窒化ホウ素の用途
- HBN is used on nanoelectronics devices as a substitute to graphene substrate
- 六方晶窒化ホウ素 in its thin form is used as coatings that resists corrosion
- HBN is often used in the manufacture of sensor materials. It is also used in electron tunneling due to its low value of dielectric constant.
立方晶窒化ホウ素
What is cubic Boron Nitride?
c-BNは 六方晶窒化ホウ素（h-BN） produced under high temperature and pressure.
最大の特産品は c-BN 世界で2番目に硬い素材であるという点です。その機械的強度は 立方晶窒化ホウ素 ダイヤモンドと並ぶ人気を誇ります。ホウ素の最も人気のある多形体の一つです。 窒化物.
Structure of 立方晶窒化ホウ素
The basic structure of 立方晶窒化ホウ素 is crystalline. It has density around 3.5 g/cm3 and appears in pale yellow or transparent complexion. C-BN follows alternate arrangement of Boron and Nitrogen atoms. Here, the ホウ素窒素 atoms follow covalent bonding which is the basic reason of its hardness and stability.
Cubic Boron Nitride Formula is given as c-BN. There are two popular types of c-Bn available today in the market. One is dense 立方晶窒化ホウ素 and the other polycrystalline cubic Boron Nitride.
Cubic Boron Nitride Properties
C-BN is a brilliant semiconductor whose bandgaps are susceptible to changes in applied pressure. These changes in bandgap helps them excel as electric insulators. 立方晶窒化ホウ素 are generally inert and possesses low dielectric constant value. Their thermal conductivity is around 1300 KW/MK.
When it comes to reactivity, c-BN remains non-respondent even to ferrous materials. The optical range dealt by 立方晶窒化ホウ素 varies from Ultra violet to the visible spectrum.
立方晶窒化ホウ素対ダイヤモンド
ダイヤモンドほど硬くはないが、 立方晶窒化ホウ素 ダイヤモンドと比較すると特別な位置を占めています。 Cubic boron Nitride hardness is 4500 Kg/mm2 whereas diamond has hardness around 600 Kg/mm2.The value of modulus both young’s and bulk are also in similar range of 800 – 1000 and 370 – 450.
Furthermore, when it comes to structure, like diamond, c-BN has its two base atoms that are different. The similarity of both diamond and c-BN is generally attributed to the lookalike structure they possess.
立方晶窒化ホウ素の用途
CBN切削工具材料
立方晶窒化ホウ素 exhibits both young’s and Bulk modulus greater than Boron Carbide and Silicon Carbide. This very reason strongly contributes to the hardness of cubic Boron Nitride. The hardness makes them suitable as abrasives and help them function as CBN切削工具材料. Generally Dense c-Bn is used for cutting application and porous type for grinding requirements.
The inert nature of Cubic Boron Nitride also helps them function as cutting and machining material. Unlike diamond it doesn’t react to iron. However, conventional c-Bn requires manipulation for utilising it in cutting application. This is generally done during the conversion of h-Bn to c-Bn while sintering.
cbn as electrical insulators
Apart from hardness 立方晶窒化ホウ素 also excels in electrical insulators. This is attributed to their wide bandgap.
cbn in semiconductor applications
By coating aluminium and Group 8 metals, C-BN functionality of becoming a sink is popular in electronic industry. C-BN is used as heat sink in lasers, microelectronic devices and LEDs.
立方晶窒化ホウ素 also adds value during semiconductor synthesis to obtain p and N type by proper doping. The common materials used for doping are Silicon or Beryllium. These semiconductors work at high temperature and are used in UV sensors.
c-BN研削ホイール
の発明 c-BN研削ホイール merited precision manufacturing due to the increased efficiency. wheels made up of c-BN contributed to industries such as aerospace, machines, tool production and automobile. c-BN研削ホイール also offer high hardness and good performance on comparison with SiC and Alumina. They ensure structural integrity at higher temperature and undergo no degradation.
The wheels of c-BN can withstand high temperature and deals with the amount of heat generated during the process. The resistance to wear and tear is also economically beneficial while considering c-BN grinding wheels. c-BN grinding wheels offer excellent surface finish and keeps away the work piece wastage. It also ensures lesser cycle time as the tasks are done quickly and precisely.
Super abrasive wheels – or diamond c-BN wheel
The super abrasive wheels are the ones differ from conventional wheel of Sic and Alumina. They are made from combining c-Bn and diamond. The super abrasive wheel offers better thermal conductivity limiting the rise in temperature of the workpiece. The ダイヤモンドc-Bnホイール また、高精度で精密な切断を実現し、寿命の延長に貢献します。
結論
立方晶窒化ホウ素 現代科学と材料製造において、希土類元素は望ましい存在です。ダイヤモンドなどの材料と比較しても競争力があり、硬度、強度、電気絶縁性といった特性に優れています。また、広いバンドギャップ、不活性、低誘電率、光学特性といった特性も、貴金属の優位性を示す要因です。