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Method for measuring bond strength of aggregate in superfine and nanometer tungsten carbide powder

A nano-tungsten carbide, bonding strength technology, applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve the problems of complex test process and so on

Active Publication Date: 2009-06-17
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of Niesz et al. requires isostatic pressing equipment, and needs to test multiple samples under different pressures. The test process is relatively complicated, and the obtained results reflect the macroscopic strength, and do not directly indicate the bonding strength of primary particles.

Method used

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  • Method for measuring bond strength of aggregate in superfine and nanometer tungsten carbide powder
  • Method for measuring bond strength of aggregate in superfine and nanometer tungsten carbide powder
  • Method for measuring bond strength of aggregate in superfine and nanometer tungsten carbide powder

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Embodiment Construction

[0030] Raw material: tungsten carbide powder with an average particle size of 100nm.

[0031] Testing process:

[0032] (1) Weigh 2.5g of the above-mentioned tungsten carbide powder on a tray electronic balance, put it into a steel mold with a diameter of 10mm, and use the one-way compression method to continuously compress the powder on the CMT5000 universal mechanical testing machine. 0.5mm / s.

[0033] (2) After being pressed and formed under 300MPa pressure, carefully demould to obtain a green body with complete shape. The mass of the green body was weighed on an electronic balance to be 2.30 g, and the final height of the green body was measured to be 4.500 mm with a micrometer.

[0034] (3) After taking out the powder, put the mold on the universal mechanical testing machine, and use one-way or two-way method to continuously compress the mold, and the computer automatically records the elastic deformation of the mold and the beam under a certain pressure.

[0035] (4) ...

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Abstract

The invention relates to a method for measuring the primary particle combination strength in an aggregate body in superfine or nanometer tungsten carbide powder. The steps are as follows: (1) on a universal dynamic tester, the superfine or nanometer tungsten carbide powder is added into a single-way or double-way continuous steel or hard alloy compressed mould; (2) according to pressures and displacements during compression process automatically recorded by a computer, the relation curve of a green density and a pressure is drawn, so that a critical pressure presented at a turning point is determined; (3) according to the relative density of the aggregate body and the like, the porosity degree between the aggregate bodies are calculated; (4) the primary particle combination strength of the tungsten carbide or the aggregate body strength of the tungsten carbide are calculated according to the critical pressure. In the method of the invention, general dynamic test equipment is used, and the operation is simple and convenient.

Description

technical field [0001] The invention relates to the field of ultrafine and nanometer tungsten carbide powders, in particular to a method for measuring the bonding strength between primary particles in "agglomerates" in ultrafine and nanometer tungsten carbide powders. Background technique [0002] Ultrafine and nanometer tungsten carbide powder is one of the research hotspots in the field of cemented carbide materials. However, as the particle size of tungsten carbide powder decreases, the surface energy increases sharply. In order to reduce the energy of the system, a large number of primary particles (primary particles) in the powder will combine to form larger secondary particles, that is, "agglomerates" through the surface tension or the bond bridge effect of the solid. "Agglomerates" are divided into "soft agglomerates" and "hard agglomerates". "Soft agglomeration" generally refers to the agglomerates formed by the connection between particles through weak physical fo...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N19/00G06F19/00
Inventor 曹瑞军林晨光贾成厂
Owner GRIMAT ENG INST CO LTD
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