CuZn40 粉末

CuZn40 又称黄铜粉,是一种铜锌合金,由 40% 的锌和剩余的铜组成。它集强度、延展性、耐腐蚀性、可加工性和经济性于一身,是应用最广泛的合金粉末之一。

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目录

CuZn40 又称黄铜粉,是一种铜锌合金,由 40% 的锌和剩余的铜组成。它集强度、延展性、耐腐蚀性、可加工性和经济性于一身,是应用最广泛的合金粉末之一。

CuZn40 Powder Composition

The composition of CuZn40 brass powder is:

要素 组成
铜 (Cu) 平衡
锌 (Zn) 39-41%
  • Copper forms the primary matrix imparting ductility and corrosion resistance.
  • Zinc provides solid solution strengthening and improves machinability.

This composition is referred as ‘Free machining brass’ or ‘High machinability brass’ owing to the enhancements from the 40% zinc content.

Small additions of lead up to 0.5% may be present in some varieties to further augment machinability. Lead-free CuZn40 powder is preferred for food contact and environmental safety.

Properties of CuZn40 Powder

CuZn40 powder offers a versatile mix of properties making suitable for wide usage across industries:

物业 价值
密度 8.4-8.8 g/cm3
熔点 900-920°C
导电性 26% IACS
导热性 120 W/m-K
热膨胀系数 20 x 10<sup>-6</sup> /°C
弹性模量 97-110 GPa
拉伸强度 330-550 MPa
伸长率 15-40%
硬度 80-90 布氏硬度
热稳定性 Good, up to 400°C
  • Excellent formability and ductility – High elongation enables extensive cold working and forming.
  • Good machinability and finish – Reduction in machining forces compared to copper alloys with lower or no zinc.
  • 高强度 – Up to twice the strength of copper due to zinc in solid solution.
  • 耐腐蚀 -Forms protective oxide layer in atmosphere. Better than plain carbon steels.
  • 非磁性 – Suitable for applications requiring minimal magnetic properties.
  • Good thermal stability – Dimensions stable during thermal cycling up to 400°C range.

This combination of strength, ductility, thermal and electrical properties makes CuZn40 suitable for wide usage in electrical, automotive, marine and industrial applications.

铜锌40

Applications of CuZn40 Powder

The versatile properties of CuZn40 powder make suitable for the following applications:

应用 益处
Electrical connectors High strength, good conductivity, corrosion resistance
Fasteners, gears Good machinability, wear resistance
Bearings, bushings Compatible with rotating shafts, good lubricity
Welding rods Compatibility with steel, good brazeability
Decorative parts Attractive gold color, good finish
热管理 Higher thermal conductivity than steels
  • Electrical connectors and contacts – Used widely in pins, connectors due to strength, conductivity and cost advantage over alternatives.
  • Machined parts – Suitable for nuts, bolts, gears, valves etc. owing to excellent machinability.
  • Bearings and bushings – Compatible with steel shafts while providing good wear resistance and lubricity.
  • Welding consumables – Popular in Cu-Zn filler rods and brazing alloys to join steel components.
  • Decorative accessories – Provides aesthetic gold finish for decorative parts and jewelry.
  • Thermal components – Used in heat exchangers and thermal management parts leveraging its higher thermal conductivity.

CuZn40 powder is widely accepted across industrial sectors owing to its versatile properties, performance and economical pricing.

CuZn40 Powder Specifications

CuZn40 powder is available in various size ranges, shapes and purity levels:

规格 选项
粒径分布 10 - 150 微米
平均粒径 20, 45, 60, 100 microns
粉末形状 不规则球形
表观密度 Up to 75% theoretical
流量 最多 25 秒/50 克
纯净 高达 99.9%
合金变体 CuZn10, CuZn30, CuZn37
  • Smaller particle sizes below 45 microns allow greater densification but reduces flowability.
  • Spherical powder provides better flow and packing density suited for additive manufacturing.
  • Higher apparent density and flow rates improve powder handling and processing.
  • High purity variants available for more demanding applications.
  • Range of zinc levels between 10-40% available for varying strength-ductility.

CuZn40 powder can be customized in terms of particle size, shape, density, flow characteristics and alloy composition based on application requirements.

Consolidation Methods for CuZn40 powder

CuZn40 powder can be processed into full density components using techniques like:

方法 详细信息
Compaction + Sintering Older economical method with shape limits.
金属注射成型 (MIM) Net shape parts with excellent precision and surface finish.
快速成型制造 Direct printing of complex, dense parts from CAD models.
Hot Extrusion For simple, axisymmetric shapes like rods and tubes.
Roll compaction For sheet and strips requiring good ductility.
  • Pressing followed by sintering is commonly used but requires secondary processing for full densification.
  • MIM offers highest precision and surface finish but needs high volumes to justify tooling costs.
  • Additive manufacturing methods like binder jetting and fused deposition modeling are gaining popularity for design flexibility.
  • Extrusion and rolling well suited for simple geometries like bars, sheets etc. leveraging ductility.

The consolidation method controls final properties like density, precision, surface finish and microstructure.

Heat Treatment of CuZn40 Parts

Heat treatment of CuZn40 parts helps tailor a range of mechanical properties:

热处理 目的
Solution annealing Restores ductility after cold working
缓解压力 Removes residual stresses
沉淀硬化 Strengthening by aging after solutionizing
  • Annealing at 700-900°C followed by slow cooling softens the alloy by removing effects of cold work allowing further forming.
  • Low temperature age hardening in 150-350°C range causes precipitation of copper-rich phase increasing strength up to 50% but with loss of ductility.
  • Stress relieving around 300-500°C helps reduce residual stresses from prior shaping.

Heat treatment expands the versatility of CuZn40 alloy by enabling property enhancements as per application needs.

Comparison of CuZn40 with Alternatives

Here is how CuZn40 compares to other popular copper alloy powders:

合金 铜锌40 CuSn6 CuNi18Zn20 Bronze
实力 中型 最高 中型
延展性 中型 中型
耐腐蚀性 良好 优秀 优秀 优秀
导热性 120 W/m-K 50 W/m-K 20 W/m-K 60 W/m-K
费用 中型
  • CuSn6 has superior corrosion resistance but lower strength and thermal conductivity. More expensive.
  • CuNi18Zn20 has the highest strength but lowest ductility and thermal conductivity.
  • Bronzes like CuSn10 offer excellent corrosion resistance but only moderate strength.
  • CuZn40 provides the most balanced overall properties and has the lowest cost.

Owing to its well-rounded properties, excellent formability, machinability and low cost, CuZn40 is the most popular copper alloy powder for wide usage across industrial segments.

CuZn40 Powder Manufacturers

CuZn40 powder is produced in high volumes globally by major metal powder producers:

制造商 国家
霍加纳斯 瑞典
中国石油天然气集团公司 中国
Miyou Group 中国
GKN Hoeganaes 美国
Jien Nickel Taiwan
SCM 金属产品公司 日本

信誉良好的制造商都有严格的质量控制,在成分、粒度分布、表观密度和杂质含量方面都符合国际标准。

They can customize CuZn40 powder compositions and attributes like particle shape, density, flow rates etc. based on customer requirements for their specific application.

CuZn40 Powder Pricing

As a widely produced commercial alloy powder, CuZn40 is quite economical. Indicative pricing is:

粉末类型 颗粒大小 价格($/公斤)
按压 Under 150 microns $5-15
用于烧结 45-150 微米 $8-20
For MIM 10-20 microns $12-25
对于 AM 15-45 微米 $15-30
高纯度 Up to 5 microns $25-40
  • Irregular shape powder for pressing and sintering is most economical.
  • Spherical powder for MIM and AM is costlier due to gas atomization process.
  • Smaller particle sizes and high purity grades attract price premium.
  • Large volume orders in tons can further reduce per-kilogram pricing.

CuZn40 powder is competitively priced owing to its broad commercial usage allowing economical production in high volumes.

Health and Safety Precautions for CuZn40 Powder

Like any fine metal powder, CuZn40 powder requires safe handling:

危险 预防措施 个人防护设备
吸入 Avoid breathing powder dust. Ensure ventilation Respirator mask
皮肤接触 Wear gloves. Wash after contact. 手套
目光接触 Wear safety glasses. Rinse if contacted. 安全护目镜
摄入 Avoid hand-mouth contact. Wash hands.
Dust explosion Avoid powder clouds. Ground equipment.
  • Use PPE – respirator, gloves, goggles when handling powder.
  • 避免皮肤接触。接触后要清洗。
  • Store sealed containers away from sparks, flames.
  • 确保适当的通风和集尘。
  • Refer SDS and local regulations for complete safety guidelines.

Proper precautions and PPE during storage, handling and processing minimize health and safety risks.

Inspection and Testing of CuZn40 Powder

To ensure quality, CuZn40 powder should be tested as follows:

参数 方法 规格
化学成分 Combustion analysis or XRF Zn 40% ± 1%, Pb < 1000 ppm
粒径分布 Sieving, laser diffraction D10、D50、D90 在范围内
表观密度 霍尔流量计 Minimum specified
流量 霍尔流量计 Maximum specified
杂质 ICP 或 LECO 分析 Low oxygen and nitrogen

Routine testing as per ASTM standards ensures consistency in production and high quality powder suitable for end applications.

Buyers must insist on quality certificates from reputable manufacturers. In-house testing periodically is also recommended.

常见问题

Q. What is CuZn40 used for?

A. CuZn40 finds wide usage in electrical connectors, plumbing fittings, gears, decorative parts etc. leveraging its strength, ductility, corrosion resistance and machinability.

Q. What is the difference between regular and leaded brass alloy?

A. Leaded brass contains a small amount of lead up to 3% to enhance machinability while regular brass is lead-free. Lead-free is preferred for food contact and environmental safety reasons.

Q. Does CuZn40 require heat treatment?

A. Optional heat treatment can be done to soften and restore ductility via annealing or to strengthen by precipitation hardening.

Q. What methods are used to make parts from CuZn40 powder?

A. Compaction followed by sintering, metal injection molding and additive manufacturing processes like binder jetting and FDM are popular techniques to consolidate CuZn40 powder into dense components.

Q. Is CuZn40 powder safe to handle?

A. Like any fine metal powder, precautions should be taken to avoid inhalation and skin contact. Proper ventilation, PPE and safe handling procedures minimize risks.