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Binderless cbn sintering with cubic press

A binderless and pressure technology is applied to sintering a binderless cBN body, and on the other hand, it relates to the field of a method for preparing a cBN body, which can solve the problems of high cost and difficulty in ultra-high pressure and high temperature conditions.

Active Publication Date: 2019-03-01
SMITH INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such ultra-high pressure and high temperature conditions can be difficult and costly to achieve compared to the pressure and temperature conditions used to form PCBN

Method used

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  • Binderless cbn sintering with cubic press
  • Binderless cbn sintering with cubic press
  • Binderless cbn sintering with cubic press

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Embodiment Construction

[0018] In the following detailed description, only certain example embodiments of the disclosed subject matter are shown and described, by way of illustration. As those skilled in the art will realize, the disclosed subject matter may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Throughout the specification, the same reference numerals designate the same elements.

[0019] According to embodiments of the present disclosure, by using the boron nitride starting material compositions discussed herein, it is possible to form sintered binder-free particles with high density and high hardness by sintering boron nitride particles under relatively low pressure conditions. Cubic boron nitride (cBN) host. The resulting sintered binderless cBN body consists essentially of cBN grains bonded together, and may include very small amounts of residual material or impurities (e.g., less than 3%, less than 1%, or less than 0.5% ...

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Abstract

A method of sintering a binderless cBN body includes providing a boron nitride particle mixture into a pressure chamber, the boron nitride particle mixture having a first type of boron nitride particles and boron nitride filler particles, and the boron nitride filler particles having a different size and / or type than the first type of boron nitride particles, and sintering the boron nitride particle mixture in the pressure chamber to form the cBN body by generating a pressure in the pressure chamber of less than 7.7 GPa and heating the boron nitride particle mixture to a temperature ranging from about 1900 DEG C to about 2300 DEG C, wherein the cBN body has a density of at least 97 percent.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to and benefit of U.S. Provisional Application No. 62 / 356,225, filed June 29, 2016, which is hereby incorporated by reference in its entirety. Background technique [0003] Cubic boron nitride (cBN) particles can be sintered together in the presence of ceramic or metallic binders to form polycrystalline cubic boron nitride (PCBN) composites with engineered material properties such as increased wear resistance or toughness Material. For example, PCBN composites can be formed by high pressure high temperature (HPHT) sintering of a mixture comprising cBN particles (eg, a superhard material) as a hard phase and aluminum (Al) metal powder, which becomes a liquid sintering reactant. HPHT sintering of PCBN may include using a pressure between about 4-7 GPa and a temperature between about 1200°C and 1500°C. In some applications, cBN particles can be sintered together without the use of binders ...

Claims

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Application Information

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IPC IPC(8): C04B35/583C04B35/645
CPCC04B35/645C04B2235/5436C04B2235/5445C04B2235/5472C04B2235/604C04B2235/767C04B2235/77C04B2235/95C04B2235/96C04B35/5831C04B2235/386C04B2235/762
Inventor Y.鲍
Owner SMITH INT INC