탄화 붕소

한글명:탄화 붕소

카스 번호12069-32-8

상품명:Boron carbide

CBNumberCB6315643

분자식CB4

포뮬러 무게55.25

MOL 파일12069-32-8.mol

동의어(한글)

탄화붕소

붕소 카바이드

화학적 성질

녹는점	2450°C
끓는 점	3500°C
밀도	2.51 g/mL at 25 °C (lit.)
용해도	insoluble in H2O, acid solutions
물리적 상태	가루
색상	검은색
Specific Gravity	2.51
비저항	4500 (ρ/μΩ.cm)
수용성	물에 불용성.
Crystal Structure	Hexagonal
Merck	14,1344
안정성	안정적인. 산화제와 호환되지 않습니다. 가연성이 아닙니다.
InChIKey	NOJMLSPGQSYAIT-UHFFFAOYSA-N
CAS 데이터베이스	12069-32-8(CAS DataBase Reference)
NIST	Boron carbide(12069-32-8)
EPA	Boron carbide (B4C) (12069-32-8)

위험 및 안전 성명

위험품 표기

위험 카페고리 넘버

안전지침서

22-36/37/39-38

WGK 독일

RTECS 번호

ED7420000

TSCA

Yes

HS 번호

28499010

NFPA 704:

	0
2		0

그림문자(GHS)

탄화 붕소 MSDS

탄화 붕소 화학적 특성, 용도, 생산

개요
Sodium tetraborate decahydrate/borax (anhydrous) is a clear, colorless or pale yellow hygroscopic substance with a faint odor of detergent. It is stable and is incompatible with powdered metalsand slightly soluble in water. It is extensively used in the industrial manufacturing of metallurgical fluxes, fiberglass, ceramics, fertilizers, enamels, heat-resistant glass (e.g., Pyrex), and other chemicals. It decomposes on heating or on burning producing toxic fumes including sodium oxide, reacts with strong oxidants, and in fire gives off irritating or toxic fumes (or gases).
화학적 성질
hard, black, shiny crystal(s), -325 mesh with 99.5% purity; rhomb; hardness 9.3 Mohs; less brittle than most ceramics; does not burn in oxygen flame; used as an abrasive; Knoop hardness ~27GPa; produced by reducing B2O3 with carbon at 1400°C–2300°C; used in crucible form as a container for molten salts except molten caustic and as a 99.5% pure sputtering target for producing semiconductor and wear-resistant films [KIR78] [HAW93] [MER06] [CER91]
물리적 성질
Black hard crystal; density 2.50 g/cm³; hardness 9.3 Mohs; melts at 2,350°C; vaporizes above 3,500°C; insoluble in water and acid; inert to most chemicals at ordinary temperatures; rapidly attacked by hot alkalies.
물리적 성질
Hard black shiny crystals, fourth hardest material known after diamond, cubic boron nitride, and boron oxide. Does not burn in an O flame if temperature is 2 maintained below 983°C. Maximum operating temperature 2000°C (inert, reducing) or 600°C (oxidizing). Not attacked by hot HF or chromic acid. Used as abrasive, crucible container for molten salts except molten alkali hydroxides. In form of molded shape, used for pressure-blast nozzles, wire-drawing dies, and bearing surfaces for gauges. For grinding and lapping application available mesh sizes cover range 240 to 800.
용도
Boron carbide (B4C) is a hard, black crystal that is used as an abrasive powder and as an additive to strengthen composite parts in aircraft.
제조 방법
Boron carbide is prepared by reduction of boric oxide either with carbon or with magnesium in presence of carbon in an electric furnace at a temperature above 1,400°C. When magnesium is used, the reaction may be carried out in a graphite furnace and the magnesium byproducts are removed by treatment with acid.
정의
boron carbide: A black solid, B₄C,soluble only in fused alkali; it is extremelyhard, over 9? on Mohs’scale; rhombohedral; r.d. 2.52; m.p.2350°C; b.p. >3500°C. Boron carbideis manufactured by the reduction ofboric oxide with petroleum coke inan electric furnace. It is used largelyas an abrasive, but objects can alsobe fabricated using high-temperaturepowder metallurgy. Boron nitride isalso used as a neutron absorber becauseof its high proportion ofboron–10.
Origin
Boron carbide is an artificial abrasive introduced in 1934 by the Norton Company under the name "Norbide." Washington Mills was the only producer of boron carbide in the United States in 2004.
공업 용도
Boron carbide (B4C) is produced by the hightemperature(about 1371 to 2482°C) interactionof boric oxide, B2O3, and carbon in an electricalresistance-type furnace. It is a black, lustroussolid. It is used extensively as an abrasive,because its hardness approaches that of the diamond.It is also used as an alloying agent, particularlyin molybdenum steels.
Additionally, it is used in drawing dies andgauges, or into heat-resistant parts such as nozzles.The composition is either B6C or B4C; theformer is the harder but usually contains anexcess of graphite difficult to separate in thepowder. It can be used thus as a deoxidizingagent for casting copper, and also for lapping,since the graphite acts as a lubricant. Borofluxis B4C with flake graphite, used as a casting flux.B4C parts are fabricated by hot pressing,sintering, and sinter-HIPing (HIP = hot-isostaticpress). Industrially, densification is carriedout by hot pressing (2100 to 2200°C, 20to 40 MPa) in argon. The best properties areobtained when pure fine powder is densifiedwithout additives. Pressureless sintering to highdensity is possible using ultrafine powder, withadditives (notably carbon). Less expensive thanhot pressing, sintering also can be used for morecomplex shapes.
Special part formulations include bondingB4C with fused sodium silicate, borate frits,glasses, plastics, or rubbers to lend strength,hardness, or abrasion resistance. B4C-based cermets and MMC (especially Al/B4C, Mg/B4C, Ti/B4C), and CMCs (e.g., TiB2/B4C) haveunique properties, including superior ballisticperformance, that make these materials suitablefor highly specialized applications. Hightemperaturestrength, light weight, corrosionresistance, and hardness make these compositesespecially attractive. B4C shapes can bereaction-bonded using SiC as the bondingphase. B4C–C mixtures are formed, thenreacted with silicon to create the SiC bond. SiCalso can be used as a sintering aid for B4C, andvice versa.

탄화 붕소 준비 용품 및 원자재

탄화 붕소 공급 업체

탄화 붕소 관련 검색

Send Inquriy