US 2025/0084003 A1Published application

Polycrystalline cubic boron nitride composite sheet having continuous gradient structure and preparation method thereof

AssigneesCentral South University, Sf Diamond Co., Ltd.

InventorsShaohe ZHANG, Linglong RONG, Dongpeng ZHAO, Xiangwang KONG, Jingjing WU, Haoyang ZHANG, Hua GAO, Jincheng LI, Mengyao SHAO, Changjian GENG

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Abstract

The disclosure discloses a polycrystalline cubic boron nitride composite sheet having a continuous gradient structure and a preparation method thereof. The polycrystalline cubic boron nitride composite sheet consists of a cemented carbide substrate, a continuous gradient layer, and a CBN layer from bottom to top. The continuous gradient layer contains cemented carbide and CBN, a content of CBN increases in continuous gradient from bottom to top, while a content of the cemented carbide decreases in continuous gradient from bottom to top. A volume fraction D of CBN and a volume fraction M of cemented carbide in the continuous gradient layer both satisfy exponential gradient functions. At the same time, the disclosure uses direct ink writing 3D printing technology with slurry to realize the preparation of the polycrystalline cubic boron nitride composite sheet having the continuous gradient structure.

Claims10

Dependent claims

A polycrystalline cubic boron nitride composite sheet having a continuous gradient structure, wherein the polycrystalline cubic boron nitride composite sheet consists of a cemented carbide substrate, a continuous gradient layer, and a CBN layer from bottom to top, the continuous gradient layer comprises cemented carbide and CBN, a content of the CBN increases in continuous gradient from bottom to top, a content of the cemented carbide decreases in continuous gradient from bottom to top, and in the continuous gradient layer, at a height h and from bottom to top, a volume fraction D of the CBN and a volume fraction M of the cemented carbide satisfy gradient functions (1) and (2) respectively:

D
=
(
h
H
)
n
,
0
≦
h
≦
H
(
1
)
M
=
1
-
(
h
H
)
n
,
0
≦
h
≦
H
(
2
)
wherein in the functions (1) and (2), H is a total height of the continuous gradient layer, and n is an exponent of the gradient functions (1) and (2);
and
the total height H of the continuous gradient layer is 0.05 to 5 mm, and the exponent n of the gradient functions (1) and (2) is greater than or equal to 1.

34 more elements

Dependencies are inferred from the claim text.