Fracture resistant super hard materials and hardmetals composite with functionally designed microstructure

Fang, Zhigangzak; Griffo, Anthony; White, Brian; Lockwood, G.; Belnap, Dan; Hilmas, Greg; Bitler, Jonathan W.

doi:10.1016/s0263-4368(01)00031-2

Cited by 65 publications

(29 citation statements)

References 9 publications

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“…Structural hierarchy is also particularly important. In this study it has been demonstrated that the interaction of interfaces with different properties at the different hierarchical levels may explain the experimental results in [7]. Further work has to be done in this direction, especially for the 3D simulation of crack propagation in polycrystalline materials.…”

Section: Discussionmentioning

confidence: 79%

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Structural integrity of hierarchical composites

Paggi¹

2011

Frattura Ed Integrità Strutturale

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ABSTRACT. Interface mechanical problems are of paramount importance in engineering and materials science. Traditionally, due to the complexity of modelling their mechanical behaviour, interfaces are often treated as defects and their features are not explored. In this study, a different approach is illustrated, where the interfaces play an active role in the design of innovative hierarchical composites and are fundamental for their structural integrity. Numerical examples regarding cutting tools made of hierarchical cellular polycrystalline materials are proposed, showing that tailoring of interface properties at the different scales is the way to achieve superior mechanical responses that cannot be obtained using standard materials

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Section: Discussionmentioning

confidence: 79%

“…The outcome of this research may contribute to a future development of new nanocomposite materials, mimicking the structures of biological materials. A pioneering effort in this direction is given by cellular polycrystalline materials recently designed by Fang et al [7]. Extruded single fibers were packed together and put through a further extrusion process.…”

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confidence: 99%

Structural integrity of hierarchical composites

Paggi¹

2011

Frattura Ed Integrità Strutturale

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“…Diamond based FM systems offer a significant advantage over PCD coated tools, by providing increased coating toughness, as compared to the hard, but very brittle, PCD coatings demonstrated previously [5,7]. Similar to PCD coated tools, and in order to reduce tool cost, diamond based FM coatings are typically applied to the wear surface of a WC-Co substrate, minimizing the total amount of diamond in the tool.…”

Section: Hot Pressed Samplesmentioning

confidence: 99%

Fibrous Monolith Wear Resistant Components for the Mining Industry

Knittel¹

2005

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The work performed on this program was to develop wear resistant, tough FM composite materials with efforts focused on WC-Co based FM systems. The materials were developed for use in mining industry wear applications. Components of interest were drill bit inserts for drilling blast holes. Other component applications investigated included wear plates for a variety of equipment such as pit shovels, wear surfaces for conveyors, milling media for ball milling operations, hydrocyclone cones, grader blades and dozer teeth. Cross-cutting technologies investigated included hot metal extrusion dies, drill bits for circuit board fabrication, cutting tools for cast iron and aluminum machining.An important part of the work was identification of the standard materials used in drilling applications. A materials trade study to determine those metals and ceramics used for mining applications provided guidance for the most important materials to be investigated. WC-Co and diamond combinations were shown to have the most desirable properties. Other considerations such as fabrication technique and the ability to consolidate shifted the focus away from diamond materials and toward WC-Co.Cooperating partners such as Kennametal and Kyocera assisted with supplies, evaluations of material systems, fabricated parts and suggestions for cross-cutting technology applications for FM architectures. Kennametal provided the raw materials (WC-Co and Al-TiCN powders) for the extent of the material evaluations. Kyocera shared their research into various FM systems and provided laboratory testing of fabricated materials. Kyocera also continued research of the FM systems with the intention of developing commercial markets for a variety of applications. The continued development of FM technology by Kyocera is seen as a direct result of the cooperation established under this funding. Kyocera has a specific interest in the commercial development of the FM technology and have licensed it and have paid for the right to develop FM materials for the commercial exploitation.Field testing provided by partners Superior Rock Bit and Brady Mining and Construction provided insight into the performance of the fabricated materials under actual operational conditions. Superior Rock Bit was permitted to evaluate tri-cone roller bits in drilling applications at a mine in the Iron Range of Minnesota. Brady performed evaluation of the roof bit inserts at coal mines in medium hardness strata. The coal mine used for testing was not revealed. Additional field testing of cross-cutting technology, the extrusion of hot metals, at Extruded Metals showed the potential for additional market development.While ACR was able to perform field testing in a number of mines, tunnel boring locations and at a hot metal extrusion house under this effort, limitations of material suppliers reduced our ability to take advantage of the offered facilities at mines in the southern Arizona region. Phelps Dodge mine at Green Valley Arizona provided equipment inserts to modify for evalua...

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“…Diamond based Polycrystalline diamond coated (PCD) tools are an attractive alternative to WC-Co based tools in mining and drilling applications when operating costs dictate that service life be maximized and/or conditions require the hardest of materials. Diamond based FM systems offer a significant advantage over PCD coated tools, by providing increased coating toughness, as compared to the hard, but very brittle, PCD coatings as demonstrated previously [5,7]. Similar to PCD coated tools, and in order to reduce tool cost, diamond based FM coatings are typically applied to the wear surface of a WC-Co substrate, minimizing the total amount of diamond in the tool.…”

Section: Tib 2 -Based Samplesmentioning

confidence: 99%

Fibrous Monolith Wear Resistant Components for the Mining Industry

Rigali¹,

Knittel²,

Fulcher³

2002

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During this reporting period, work continued on development of formulations using the materials identified as contenders for the fibrous monolith wear resistant components. The FM structures fabricated were: diamond/WC-Co, B 4 C/WC-Co, TiB 2 /WC-Co, WC-Co/Co, WC-Co/WC-Co. Results of our consolidation densification studies on these systems lead to the down-selection of WC-Co/WC-Co, WC-Co/Co and diamond/WC-Co for further development for mining applications including drill bit inserts, roof bit inserts, radial tools conical tools and wear plates (WC-Co based system only) for earth moving equipment. Prototype component fabrication focused on the fabrication of WC-Co/WC-Co FM conical tools, diamond/WC-Co coated drill bit insert prototypes. Fabrication of WC-Co/WC-Co FM insert prototypes for a grader blade is also underway. ACR plans to initiate field-testing of the drill bit insert prototypes and the grader blade insert this summer (2002). The first WC-Co/WC-Co FM conical tool prototypes were sent to Kennametal for evaluation towards the end of the current reporting period.4

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Fracture resistant super hard materials and hardmetals composite with functionally designed microstructure

Cited by 65 publications

References 9 publications

Structural integrity of hierarchical composites

Structural integrity of hierarchical composites

Fibrous Monolith Wear Resistant Components for the Mining Industry

Fibrous Monolith Wear Resistant Components for the Mining Industry

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