Polycrystalline diamond-hard alloy composite anvil for generating high pressure and high shear stress
A technology of polycrystalline diamond and cemented carbide, which is applied in the direction of applying stable shear force to test the strength of materials, measuring devices, instruments, etc. It can solve the problems of large size, toughness, poor wear resistance, etc., and achieve easy rotation operation, The effect of increasing the service life
Pending Publication Date: 2019-02-26
JILIN NORMAL UNIV
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[0004] The purpose of the present invention is to provide a polycrystalline diamond-tungsten carbide composite press for generating high pressure and high shear stress in view of the shortcomings that the existing single crystal diamond anvil cannot be made into a large size and has poor toughness and wear resistance. Anvil, by improving the shape and material of the anvil, it can accommodate a larger sample volume in the high-pressure high-shear experiment, and at the same time improve the toughness and wear resistance of the anvil and increase the service life of the anvil
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[0023] Such as figure 1 and figure 2 as shown,
[0024] The polycrystalline diamond-tungsten carbide composite anvil is used to generate high pressure and high shear stress. The anvil body is a cylinder, and the radius R of the cylindrical anvil is 6cm. The anvil is divided into upper and lower layers, and the upper layer is polycrystalline diamond. layer 1, the lower layer is a cemented carbide layer 2, and the polycrystalline diamond layer 1 and the cemented carbide layer 2 are combined in a manner of direct sintering; the top of the polycrystalline diamond layer 1 has a circle of chamfers, and the angle θ of the chamfers is 25°; the top surface of the chamfered polycrystalline diamond layer is the action surface of the anvil, the action surface is circular, and the radius r is 5cm.
[0025] In the present invention, if the chamfer is less than 5°, there is no size limit, and the test pressure will not go up; if the chamfer is greater than 30°, the edge and corner are cle...
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Abstract
The invention discloses a polycrystalline diamond-hard alloy composite anvil for generating high pressure and high shear stress, and belongs to the technical field of high pressure. The composite anvil is characterized in that an anvil body of the anvil is cylindrical and divided into an upper layer and a lower layer, wherein the upper layer is a polycrystalline diamond layer and the lower layer is a hard alloy layer; a circle of chamfer is arranged at the top end of the polycrystalline diamond layer of the anvil and has an angle theta of 5-30 degrees. The top surface of the chamfered polycrystalline diamond layer is an acting surface of the anvil, and is circular. Compared with currently used single crystal diamond anvils, the anvil has the advantages of being easy to process, high in toughness, large in acting surface size and the like, the diameter of a sample chamber can reach centimeter grade, and the composite anvil can be widely applied to research on the property change of high-pressure materials by a rotary press, and meets the requirements of large sample quantity, high shearing force, electrical measurement and the like in research on high-pressure shearing material systems in the high pressure physics field.
Description
technical field [0001] The invention relates to a polycrystalline diamond-tungsten carbide composite anvil for generating high pressure and high shear stress, in particular, it is a counter anvil used in a rotary press device. Background technique [0002] According to the theoretical and experimental results reported in recent years, applying shear stress to certain materials at the same time under high pressure conditions will significantly accelerate the lattice distortion of the material, reduce the phase transition pressure of the material, and even change its phase transition path, especially for layers. The change in the structure of the substance has a significant impact. Therefore, applying shear stress to materials under high pressure conditions can obtain some new structures, new phenomena and new properties that cannot be obtained under high pressure conditions alone. In the traditional hydrostatic pressure environment, the pressure on the sample is isotropic, a...
Claims
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Login to View More IPC IPC(8): G01N3/02G01N3/24
CPCG01N3/02G01N3/24
Inventor 马艳章武晓鑫许洪新
Owner JILIN NORMAL UNIV