Properties and Spot Welding Performance of Copper Composite Reinforced with Recycled Tungsten Carbide

2010 ◽  
Vol 154-155 ◽  
pp. 1485-1488
Author(s):  
Zuhailawati Hussain ◽  
Indra Putra Almanar
Keyword(s):  
Electrical Conductivity ◽  
Tungsten Carbide ◽  
Spot Welding ◽  
Copper Matrix ◽  
Raw Material ◽  
Composite Electrodes ◽  
Welding Operation ◽  
Metal Metal ◽  
Copper Matrix Composite ◽  
Copper Composite

In this work, properties and spot welding performance of copper matrix composite electrode reinforced with 15 vol% tungsten carbide particulate from inexpensive raw material were investigated. Mixture of copper and recycled tungsten carbide was milled, compacted, sintered and powder forged at different pressures. Higher forging pressure resulted in higher density and electrical conductivity as it accelerates the flow of copper matrix leading to porosity elimination and improves metal-metal contact within the copper matrix by reducing porosity and oxide film. Welding operation showed that composite electrodes with higher density, electrical conductivity and hardness forms larger and stronger spot weld.

Tribological Behavior of Composite Electrodes for Spot Welding

2014 ◽  
Vol 656 ◽  
pp. 3-10
Author(s):  
Ionelia Voiculescu ◽  
Victor Geanta ◽  
Elena Manuela Stanciu ◽  
Mihai Vasile ◽  
Tiberiu Laurian ◽  
...  
Keyword(s):  
Tungsten Carbide ◽  
Spot Welding ◽  
Mechanical Characteristics ◽  
Local Heating ◽  
Tribological Characteristics ◽  
Strengthening Effect ◽  
Composite Electrodes ◽  
Metallic Elements ◽  
Melted Zone ◽  
Resistance To Deformation

The paper presents some aspects regarding tribological characteristics of composite tops of the electrodes for spot welding. The solution aims to improve the resistance to deformation and high intensity electric current conductibility without loses and excessive local heating. The composite material was obtained by mechanical alloying process, from a mixture of tungsten carbide, chromium, CuNiAl alloy and cooper powder which has been heated in furnace at 1100°C. The embedding process aims to avoid the toxic effects of metallic elements such as Be and Zr, which are usually introduced in cupper alloys for improving the mechanical characteristics. The tribological characteristics and microhardness of the melted zone were measured in order to estimate the strengthening effect obtained by the tungsten carbide presence for different mixture recipe.

Studies on Preparation of Ti3SiC2 Particulate Reinforced Cu Matrix Composite by Warm Compaction and Its Tribological Behavior

2007 ◽  
Vol 534-536 ◽  
pp. 929-932 ◽  
Author(s):  
Tungwai Leo Ngai ◽  
Zhi Yu Xiao ◽  
Yuan Biao Wu ◽  
Yuan Yuan Li
Keyword(s):  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Relative Density ◽  
Matrix Composite ◽  
Copper Matrix ◽  
High Density ◽  
Green Density ◽  
Warm Compaction ◽  
Copper Matrix Composite ◽  
Particulate Reinforced

Conventional powder metallurgy processing can produce copper green compacts with density less than 8.3 g/cm3 (a relative density of 93%). Performances of these conventionally compacted materials are substantially lower than their full density counterparts. Warm compaction, which is a simple and economical forming process to prepare high density powder metallurgy parts or materials, was employed to develop a Ti3SiC2 particulate reinforced copper matrix composite with high density, high electrical conductivity and high strength. In order to clarify the warm compaction behaviors of copper powder and to optimize the warm compaction parameters, effects of lubricant concentration and compaction pressure on the green density of the copper compacts were studied. Copper compact with a green density of 8.57 g/cm3 can be obtained by compacting Cu powder with a pressure of 700 MPa at 145°C. After sintered at 1000°C under cracked ammonia atmosphere for 60 minutes, density of the sintered compact reached 8.83 g/cm3 (a relative density of 98.6%). Based on these fabrication parameters a Ti3SiC2 particulate reinforced copper matrix composite was prepared. Its density, electrical conductivity, ultimate tensile strength, elongation percentage and tribological behaviors were studied.

A simple and economical method for the synthesis of steel-reinforced copper composite

2020 ◽  
pp. 002199832095639
Author(s):  
Feras Kafiah ◽  
Jafar Al-Haidary ◽  
Sami Masadeh ◽  
Emad Abdelsalam ◽  
Malek Alkasrawi
Keyword(s):  
Brinell Hardness ◽  
Copper Matrix ◽  
Stir Casting ◽  
Compressive Yield Strength ◽  
Micro Hardness ◽  
Particle Content ◽  
The Matrix ◽  
Copper Matrix Composite ◽  
Steel Particle ◽  
Copper Composite

The present study explores a new method of steel particle-reinforced copper matrix composite synthesis. Steel reinforced copper was prepared by stir casting processing method at variable percentages between 10 wt% and 50 wt%. Characterization and mechanical testing were performed on these composites using a variety of techniques. The results showed that the microstructure of the composites has a uniform distribution of steel particles in the matrix with good interfacial integrity. Brinell hardness, tensile and yield strengths, impact energy and compressive yield strength of the composites increased with increasing steel particle contents. Vickers micro-hardness increased markedly at the interface region between particle and matrix evident by the hardness maps. The friction coefficient increased proportionally with increasing steel particle content in the composite, but the contrary was noticed for accumulative wear amount. A slight decrease in deformability is expected by increasing particle content. A ductile fracture was noticed in fractographs of fracture surfaces. Cracks are propagated in the Cu matrix up to the point of fracture, i.e. not through the interfacial boundaries.

A Study on Ti3SiC2 Reinforced Copper Matrix Composite by Warm Compaction Powder Metallurgy

2006 ◽  
Vol 532-533 ◽  
pp. 596-599 ◽  
Author(s):  
Tungwai Leo Ngai ◽  
Yuan Yuan Li ◽  
Zhao Yao Zhou
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Powder Metallurgy ◽  
Ultimate Tensile Strength ◽  
Matrix Composite ◽  
Copper Matrix ◽  
Warm Compaction ◽  
Copper Matrix Composite ◽  
Particulate Concentration ◽  
Particulate Reinforced

Increasing density is the best way to increase the performance of powder metallurgy materials. Conventional powder metallurgy processing can produce copper green compacts with density less than 8.3g/cm3 (a relative density of 93%). Performances of these conventionally compacted materials are substantially lower than their full density counterparts. Warm compaction, which is a simple and economical forming process to prepare high density powder metallurgy parts or materials, was employed to develop a Ti3SiC2 particulate reinforced copper matrix composite with high strength, high electrical conductivity and good tribological behaviors. Ti3SiC2 particulate reinforced copper matrix composites, with 1.25, 2.5 and 5 mass% Ti3SiC2 were prepared by compacting powder with a pressure of 700 MPa at 145°C, then sintered at 1000°C under cracked ammonia atmosphere for 60 minutes. Their density, electrical conductivity and ultimate tensile strength decrease with the increase in particulate concentration, while hardness increases with the increase in particulate concentration. A small addition of Ti3SiC2 particulate can increase the hardness of the composite without losing much of electrical conductivity. The composite containing 1.25 mass% Ti3SiC2 has an ultimate tensile strength of 158 MPa, a hardness of HB 58, and an electrical resistivity of 3.91 x 10-8 Ω.m.

scholarly journals A nano-micro dual-scale particulate-reinforced copper matrix composite with high strength, high electrical conductivity and superior wear resistance

RSC Advances ◽  
2018 ◽  
Vol 8 (54) ◽  
pp. 30777-30782 ◽  
Author(s):  
Cunlei Zou ◽  
Zongning Chen ◽  
Enyu Guo ◽  
Huijun Kang ◽  
Guohua Fan ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Wear Resistance ◽  
Matrix Composite ◽  
High Strength ◽  
Copper Matrix ◽  
High Electrical Conductivity ◽  
Copper Matrix Composite ◽  
Particulate Reinforced ◽  
Dual Scale

A nano Cu5Zr and micro ZrB2 dual-scale particulate-reinforced copper matrix composite is prepared by in situ synthesis and heat treatment, which has high strength, high electrical conductivity and superior wear resistance.

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