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Functionally graded carbides

A functional gradient and carbide technology, applied in chemical instruments and methods, crystal growth, metal layered products, etc., can solve problems such as low feed rate and uninterrupted cutting

Inactive Publication Date: 2017-11-28
UNIV OF UTAH RES FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, increased hardness comes at the expense of fracture toughness, and low toughness ceramic tools have been limited to applications with low feed rates and uninterrupted cutting

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment

[0070] Tantalum carbide monoliths were fabricated from ζ-Ta 4 C 3-x Formed, with dimensions 4 x 3 x 45 mm, as specified in ASTM Standard C-1161-02, Measurement of Flexural Strength of Advanced Ceramics. ζ-Ta 4 C 3-x The monolith was processed by hot pressing and contained 95% by weight ζ-Ta 4 C 3-x . Rod specimens were supported on one end and the long face was exposed to hydrogen and 5% methane (CH 4 ) for a fixed period of time in the range of 10-20 hours to carburize the specimen.

[0071] Carburized samples were characterized by three techniques. (a) Evaluation of the microstructure on etched cross-sections near the carburized surface using an optical microscope (model: MEF4M, Leica, Wein, Austria). (b) An X-ray diffractometer (XRD, model Philips X'Pert-MPD, PANalytical Inc., Westborough, MA) and associated software was used to identify crystalline phases and estimate the weight percent of phases in the substrate and carburized surface. (c) Using a Knoop microhard...

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Abstract

A functionally graded carbide body (400) can include a group 5 metal carbide substrate having a bulk composition region (410) that contains at least 70 wt% of a rhombohedral [zeta]-phase carbide. A [gamma]-phase-rich region (420) having a [gamma]-phase-rich composition can be at a surface (430) of the substrate, and a phase composition gradient region (440) can transition from the [gamma]-phase-rich composition region at the surface to the bulk composition region at a gradient depth (450) below the surface.

Description

[0001] Related Patent Applications [0002] This patent application claims priority to US Provisional Patent Application 62 / 125,488, filed January 22, 2015, which is incorporated herein by reference. Background technique [0003] Hard materials for applications such as machining in rock drilling tools and cutting tools for wear-resistant inserts have evolved from high-speed tool steels to hard carbides, cermets, ceramics, polycrystalline cubic boron nitride (CBN ) and polycrystalline diamond (PCD). This evolution is driven by the need for higher hardness, especially at high temperatures, to reduce wear at higher cutting rates and thus increase productivity. However, increased hardness comes at the expense of fracture toughness, and low-toughness ceramic tools have been limited to applications with low feed rates and uninterrupted cuts. [0004] Ideally, tool materials should have high hardness against wear and abrasion, high fracture toughness against thermal and mechanical ...

Claims

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Application Information

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IPC IPC(8): B32B15/04C22C27/02C22C29/02C22C45/10C30B21/02
CPCB32B15/04C22C27/02C22C29/02C22C1/055C22C29/06B22F2207/01B22F2998/10B22F2999/00C22C1/051B22F2003/248B22F2201/30B22F2201/013C04B35/5607
Inventor D·沙尔缇R·A·卡特勒M·M·塞格纳托维茨
Owner UNIV OF UTAH RES FOUND
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