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Wear performance of nano-engineered boron doped graded layer CVD diamond coated cutting tool for machining of Al-SiC MMC
Published in Elsevier Ltd
2019
Volume: 426-427
   
Pages: 1536 - 1547
Abstract
Machining of Al-SiC metal matrix composite (MMC) is still being a challenging task in the automotive and aerospace sector due to its frequent tool wear while processing this MMC. The hard Polycrystalline diamond tools (PCD) are used as a cutting tool in many sectors for machining of MMC. But the usage of PCD is commercially not viable due to its high cost involved in the fabrication. In this regard, low-cost diamond-coated tungsten carbide (WC-Co) tools are considered as an alternative to PCD. However, the diffusion of cobalt from WC-Co during diamond deposition promotes higher graphitization at the diamond-carbide interface. This induces coating delamination during MMC machining. This outward diffusion of cobalt can be hindered by doping boron in the diamond lattice to enhance adhesion strength of the coating. Hence in this work, the boron doped graded layer diamond coating (BDD/transition layer/NCD) on WC-Co was proposed to improve the machining performance of MMC. In this work, four different CVD diamond coated WC-Co tools such as microcrystalline diamond coating (MCD), nano-crystalline diamond coating (NCD), boron-doped diamond coating (BDD) were considered for comparison along with the proposed tools. The different phases (sp 3 and sp 2 ) in the diamond coating were analyzed through cross-sectional Raman mapping technique. The Rockwell indentation test confirms that the better adhesion strength obtained in BMTN coated tools. The wear behavior of these diamond coated tools was tested by machining of AA2124/25%SiC p material. In addition, performances of these tools were compared with widely accepted industrial grade PCD tools. The temperature at the cutting zone, chip morphology and surface roughness of the machined component were studied through an appropriate test method. The occurrence of edge chipping while machining was continuously monitored through acoustic emission (AE) signals. The machining results show that BMTN coated tool exhibits least tool wear (VB = 0.25 mm) in comparison with MCD (VB=0.47 mm), NCD (VB=0.57 mm), BDD (VB= 0.33 mm) coated tools and PCD (VB = 0.29 mm) tools respectively. In addition, the results of AE signals show that MCD, NCD coated tools and PCD tools undergone edge chipping whereas there was no edge chipping observed in BDD and BMTN tools. Thus Nano –Engineered BMTN tools observed to be a preferred cutting tool for efficient machining of Al-SiC MMC material. © 2018 Elsevier B.V.
About the journal
JournalData powered by TypesetWear
PublisherData powered by TypesetElsevier Ltd
ISSN00431648
Open AccessNo
Concepts (29)
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    Acoustic emission testing
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    Adhesion
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    Aluminum coatings
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    Aluminum compounds
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    Bond strength (materials)
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    Boolean functions
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    Boron
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    Carbide cutting tools
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    Cobalt
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    Costs
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    Cutting tools
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    DIAMOND DEPOSITS
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    Diffusion coatings
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    Metallic matrix composites
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    Silicon carbide
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    Silicon compounds
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    Surface roughness
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    SYNTHETIC DIAMONDS
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    Tungsten carbide
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    Wear of materials
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    ACOUSTIC EMISSION SIGNAL
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    AE SIGNALS
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    Cvd diamond
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    MICROCRYSTALLINE DIAMOND
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    Nano-crystalline diamonds
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    NANO-ENGINEERED
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    POLYCRYSTALLINE DIAMOND TOOLS
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    ROCKWELL INDENTATION TESTS
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    Diamond cutting tools