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碳化钨(IV)粉末

碳化钨(IV)粉末用途

【用途1】
用于生产各种合金

碳化钨(IV)粉末名称

[ CAS 号 ]:
12070-12-1

[ 中文名 ]:
碳化钨粉

[ 英文名 ]:
Tungsten carbide (WC)

[中文别名 ]:

[英文别名 ]:

methanidylidynetungsten(1+)
Tungsten monocarbide Wolfram carbide
Tungsten carbide (WC)
Tungsten monocarbide,Wolfram carbide
EINECS 235-123-0
Tungsten Carbide
MFCD00011464

碳化钨(IV)粉末物理化学性质

[ 密度 ]:
15.63 g/cm3

[ 沸点 ]:
6000ºC

[ 熔点 ]:
2870ºC

[ 分子式 ]:
CW

[ 分子量 ]:
195.851

[ 精确质量 ]:
195.950897

[ LogP ]:
0.08130

[ 外观性状 ]:
灰色至黑色粉末

[ 储存条件 ]:
室温，密封

[ 水溶解性 ]:
Soluble in nitric acid and hydrofluroic acid. Insoluble in water.

碳化钨(IV)粉末MSDS

详细MSDS(安全技术说明书)

碳化钨(IV)粉末毒性和生态

CHEMICAL IDENTIFICATION

RTECS NUMBER :: YO7250000

CHEMICAL NAME :: Tungsten carbide

CAS REGISTRY NUMBER :: 12070-12-1

LAST UPDATED :: 199806

DATA ITEMS CITED :: 21

MOLECULAR FORMULA :: C-W

MOLECULAR WEIGHT :: 195.86

WISWESSER LINE NOTATION :: .WO..C

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

MUTATION DATA

TYPE OF TEST :: DNA damage

TEST SYSTEM :: Human Leukocyte

REFERENCE :: MUREAV Mutation Research. (Elsevier Science Pub. B.V., POB 211, 1000 AE Amsterdam, Netherlands) V.1- 1964- Volume(issue)/page/year: 392,31,1997 *** REVIEWS *** ACGIH TLV-TWA 5 mg(W)/m3; STEL 10 mg(W)/m3 DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: TLV/BEI,1997 *** U.S. STANDARDS AND REGULATIONS *** MSHA STANDARD-air:TWA 5 mg(W)/m3 DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: 3,272,1971 *** OCCUPATIONAL EXPOSURE LIMITS *** OEL-AUSTRALIA:TWA 5 mg(W)/m3;STEL 10 mg(W)/m3 JAN 1993 OEL-BELGIUM:TWA 5 mg(W)/m3;STEL 10 mg(W)/m3 JAN 1993 OEL-DENMARK:TWA 5 mg(W)/m3 JAN 1993 OEL-FINLAND:TWA 5 mg(W)/m3 JAN 1993 OEL-THE NETHERLANDS:TWA 5 mg(W)/m3 JAN 1993 OEL-THE PHILIPPINES:TWA 1 mg(W)/m3 JAN 1993 OEL-SWEDEN:TWA 5 mg(W)/m3 JAN 1993 OEL-SWITZERLAND:TWA 5 mg(W)/m3 JAN 1993 OEL-UNITED KINGDOM:TWA 5 mg(W)/m3;STEL 10 mg(W)/m3 JAN 1993 OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA check ACGIH TLV OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGIH TLV *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH RECOMMENDED EXPOSURE LEVEL (REL) : NIOSH REL TO CEMENTED TUNGSTEN CARBIDE-air:10H TWA 0.1 mg(Co)/m3 REFERENCE : NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of Health, Education, and Welfare, Reports and Memoranda. Volume(issue)/page/year: DHHS #92-100,1992 NIOSH RECOMMENDED EXPOSURE LEVEL (REL) : NIOSH REL TO TUNGSTEN, insoluble-air:TWA 5 mg(W)/m3;STEL 10 mg/m3 REFERENCE : NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of Health, Education, and Welfare, Reports and Memoranda. Volume(issue)/page/year: DHHS #92-100,1992 NIOSH RECOMMENDED EXPOSURE LEVEL (REL) : NIOSH REL TO CEMENTED TUNGSTEN CARBIDE-air:10H TWA 0.015 mg/m3 REFERENCE : NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of Health, Education, and Welfare, Reports and Memoranda. Volume(issue)/page/year: DHHS #92-100,1992 NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - X2977 No. of Facilities: 158 (estimated) No. of Industries: 4 No. of Occupations: 7 No. of Employees: 3395 (estimated) No. of Female Employees: 297 (estimated)

碳化钨(IV)粉末安全信息

[ 个人防护装备 ]:
Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter

[ 危害码 (欧洲) ]:
T

[ 风险声明 (欧洲) ]:
R23

[ 安全声明 (欧洲) ]:
22-24/25

[ 危险品运输编码 ]:
UN3178

[ WGK德国 ]:
-

[ RTECS号 ]:
YO7250000

[ 包装等级 ]:
III

[ 危险类别 ]:
4.1

碳化钨(IV)粉末制备

1.以金属钨和炭为原料，将平均粒径为3～5μm的钨粉与等物质的量的炭黑用球磨机干混，充分混合后，加压成型后放入石墨盘，再在石墨电阻炉或感应电炉中加热至1400～1700℃，最好控制在1550～1650℃。在氢气流中，最初生成W2C，继续在高温下反应生成WC。或者首先将六羰基钨［W(CO)6］在650～1000℃、CO气氛中热分解制得钨粉，然后与一氧化碳于1150℃反应得到WC，温度高于该温度可生成W2C。

2.将三氧化钨WO3加氢还原制得钨粉（平均粒度3～5μm）。再把钨粉与炭黑按等摩尔比的混合物（用球磨机干混约10h），在1t/cm2左右的压力下加压成型。将该加压成型料块放进石墨盘或坩埚内，用石墨电阻炉或感应电炉在氢气流中（使用露点为-35℃的纯氢）加热至1400～1700℃（最好是1550～1650℃），使之渗碳则生成WC。反应从钨粒周围开始进行，因为在反应初期生成W2C，由于反应不完全（主要是反应温度低）除WC之外尚残存有未反应的W及中间产物W2C。所以必须加热到上述高温。应该根据原料钨的粒度大小来确定最高温度。如平均粒度为150μm左右的粗粒，则在1550～1650℃的高温下进行反应。

制备WC的反应装置如下：

图VI-7 气相分解法的制备WC的反应装置

1—柱塞；2—阀门；3—CO气；4—电炉；5—石英粒；6—不锈钢罐；7—瓷反应管

2.气相分解法。这是将六羰基钨W（CO）6经热分解制得钨粉。然后用一氧化碳气进行渗碳而制备WC的方法。本法的特点在于：不需要制法1那样的高温，而是用比较简单的反应装置并在低温（1150℃）下就能容易制得WC。如图Ⅵ7所示。将填充石英等颗粒的不锈钢罐装到立式瓷制反应管中，在CO气流中，将W（CO）6迅速加热到分解温度，首先得到钨粉。此时，即使把分解温度从650℃升到1000℃，所产生的钨粉大小几乎不变。用约1mm的W（CO）6结晶，可制得6～10μm的钨粉。从W变成WC，可接着使用如图所示装置，在CO气流中，于1150℃下保持1h就可以了。如果温度再升高，由于生成含碳少的W2C，所以加热时需要加以注意。

碳化钨(IV)粉末文献

Superficial roughness on composite surface, composite enamel and composite dentin junctions after different finishing and polishing procedures. Part I: roughness after treatments with tungsten carbide vs diamond burs.

Int. J. Esthet. Dent. 9(1) , 70-89, (2014)

The aim of this study is to investigate different instruments for finishing composite restorations, as well as examining different surfaces and interfaces of the same restoration. The null hypothesis ...

Comparison of microleakage of different margin types around Class V resin restorations in primary teeth.

Eur. J. Paediatr. Dent. 14(3) , 246-51, (2013)

This in vitro study compared the effect of a concave with a straight-bevelled cavity margin on the microleakage of Class V composite resin restorations in primary teeth.Standardised Class V cavity pre...

Qualitative and quantitative evaluation of enamel after various post-stripping polishing methods: an in vitro study.

Aust. Orthod. J. 28(2) , 240-4, (2012)

The purpose of this study was to evaluate the ultramorphology and surface roughness of permanent tooth enamel after various post-stripping polishing methods.Sixty extracted, permanent lower incisors w...

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