CN-122007419-A - High impact toughness superhard composite sheet and manufacturing method thereof

CN122007419ACN 122007419 ACN122007419 ACN 122007419ACN-122007419-A

Abstract

The invention relates to a superhard composite sheet with high impact toughness and a manufacturing method thereof, wherein the composite sheet comprises an upper superhard material layer and a lower superhard material layer which are integrated into a whole and a hard alloy matrix, the superhard material layer of the invention forms a structure with sequentially increased granularity from top to bottom, a bulge A and a bulge B at the lower layer can help the superhard material layer made of the upper superhard material to absorb impact, the integral impact toughness of the laminated superhard material layers is improved, the wear resistance of the uppermost superhard material layer is ensured, the bulge A and the bulge B can be inserted into a groove A and a groove B, the bonding capacity between the adjacent superhard material layers is improved, and the structural stability of the superhard material layers is ensured. The manufacturing method of the high impact toughness superhard composite sheet can construct a laminated superhard material layer structure with granularity increased sequentially from top to bottom to realize the effects of high impact toughness and wear resistance.

Inventors

TONG JUNFENG
LI MINGTAO
YUAN CHAOFENG
LU HAIXIA
ZHANG WEI
WANG LIANGWEN
HE TIANYUN
PANG WENLONG
WU HAO
Nie Fangcheng
HU SONGHAO
ZHANG FAN
DONG WEIBIN
WANG CHAOLONG

Assignees

河南旋风新材料科技有限公司
河南黄河旋风股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250506

Claims (10)

1. A superhard composite sheet with high impact toughness comprises a plurality of superhard material layers and a hard alloy matrix which are integrated up and down, wherein each superhard material layer comprises a top superhard material layer, a plurality of middle superhard material layers and a bottom superhard material layer which are mutually stacked, the superhard composite sheet is characterized in that the top superhard material layer is made of superhard material micro powder with the smallest granularity, the bottom superhard material layer is made of superhard material micro powder with the largest granularity, the granularity of the superhard material micro powder used for manufacturing the middle superhard material layers is increased layer by layer between the top superhard material layer and the bottom superhard material layer, grooves A are uniformly distributed on the bottom surface of the top superhard material layer, grooves A are uniformly distributed on the top surface of the middle superhard material layer, grooves B are uniformly distributed on the bottom surface of the middle superhard material layer, and protrusions B are correspondingly matched with the grooves A.
2. The superhard compact of claim 1, wherein the superhard material layer is made of diamond powder.
3. The superhard compact of claim 1, wherein the superhard material layer is made of cubic boron nitride micropowder.
4. The superhard compact with high impact toughness of claim 1, wherein the outer edge of the top layer of superhard material is provided with a cutting chamfer.
5. The superhard compact with high impact toughness according to claim 1, wherein the outer edge of the bottom of the cemented carbide substrate is provided with a mounting chamfer.
6. The superhard composite sheet with high impact toughness according to claim 1, wherein the first protrusions and the second protrusions are regular quadrangular bosses.
7. The superhard composite sheet with high impact toughness according to claim 1, wherein the intermediate superhard material layer comprises an intermediate preform, and the intermediate preform is cold-formed by ultra-hard material micro powder with a proper granularity.
8. The super-hard composite sheet as claimed in claim 7, wherein the middle super-hard material layer further comprises a micro powder layer, and the micro powder layer is formed by sintering super-hard material micro powder with proper granularity after being paved.
9. A method for manufacturing a superhard compact with high impact toughness according to claim 7, comprising the following steps: ① Manufacturing top super hard material layer and middle tabletting Mixing the ultra-hard material micro powder with the minimum granularity with the binder uniformly, cold-pressing the mixed ultra-hard material micro powder by using a proper mold to form a top ultra-hard material layer, mixing the ultra-hard material micro powder with different granularities with the binder uniformly respectively, cold-pressing the mixed ultra-hard material micro powder by using a proper mold to form a middle tabletting; ② Filling metal cup 2.1, Placing the top superhard material layer into a metal cup with the groove A facing upwards; 2.2, sequentially stacking the middle pressing sheets from small to large according to the granularity of the ultra-hard material micro powder for manufacturing the ultra-hard material layer until the ultra-hard material layer reaches the required thickness; 2.3, placing the hard alloy matrix into a metal cup, and sealing the metal cup; ③ High pressure and high temperature generation And (3) embedding the metal cup into the pyrophyllite, and placing the pyrophyllite into a hexahedral press to generate the superhard composite sheet under the conditions of high temperature and high pressure.
10. The manufacturing method of claim 9, wherein the middle super-hard material layer further comprises a micro powder paving layer, and the specific manufacturing method is as follows: ① Manufacturing top super hard material layer and middle tabletting Mixing the ultra-hard material micro powder with the minimum granularity with the binder uniformly, cold-pressing the mixed ultra-hard material micro powder by using a proper mold to form a top ultra-hard material layer, mixing the ultra-hard material micro powder with different granularities with the binder uniformly, picking out a part of the mixture of the ultra-hard material micro powder and the binder, storing the mixture of the rest ultra-hard material micro powder and the binder separately, cold-pressing the mixture of the rest ultra-hard material micro powder and the binder by using the proper mold to form an intermediate tabletting; ② Filling metal cup 2.1, Placing the top superhard material layer into a metal cup with the groove A facing upwards; 2.2, according to the granularity of the ultra-hard material micro powder for manufacturing the ultra-hard material layer, sequentially stacking the intermediate tabletting or paving the ultra-hard material micro powder to form a micro powder flat layer from small to large until the ultra-hard material layer reaches the required thickness; 2.2.1 the middle tabletting is stacked, namely, the middle tabletting is placed into a metal cup, and the first bulge and the first groove or the second groove are mutually buckled; 2.2.2.2 tiling the ultra-hard material micro powder, namely tiling a proper amount of ultra-hard material micro powder on the middle tabletting or the micro powder layering layer, filling the ultra-hard material micro powder into the groove A or the groove B to form the basic shape of the protrusion A, pressing the ultra-hard material micro powder on the tiled micro powder from top to bottom by using a die pressing head matched with the middle tabletting structure to form the basic shape of the groove B, taking out the pressed middle tabletting; 2.3, placing the hard alloy matrix into a metal cup, and sealing the metal cup; ③ High pressure and high temperature generation And (3) embedding the metal cup into the pyrophyllite, and placing the pyrophyllite into a hexahedral press to generate the superhard composite sheet under the conditions of high temperature and high pressure.

Description

High impact toughness superhard composite sheet and manufacturing method thereof Technical Field The invention relates to the technical field of superhard composite sheets, in particular to a superhard composite sheet with high impact toughness and a manufacturing method thereof. Background The superhard composite sheet is a high-performance superhard material product and comprises an upper superhard material layer and a lower superhard material layer which are integrated with a hard alloy matrix. The superhard composite sheet is prepared by mixing superhard materials such as diamond or cubic boron nitride micro powder and a metal or nonmetal binder, and then carrying out an ultra-high pressure high temperature sintering process together with a hard alloy matrix. The main component of the super hard material layer is diamond or cubic boron nitride. In general, the ultra-hard material layer formed by the fine-sized fine powder has superior impact toughness to the ultra-hard material layer formed by the fine-sized fine powder, and the ultra-hard material layer formed by the fine-sized fine powder has superior wear resistance to the ultra-hard material layer formed by the fine-sized fine powder. The traditional superhard material layer is often formed by micropowder with the same granularity, and cannot achieve both impact toughness and wear resistance. In order to ensure that the ultra-hard material layer can give consideration to impact toughness and wear resistance, the prior art provides the ultra-hard material layer which is formed by sintering the ultra-hard material layer and a hard alloy matrix together after mutually overlapping the micro powders with different granularities at high pressure and high temperature. The micro-powders with different granularities are fully mixed with the binder before being mutually laminated. But adjacent superhard materials are distinct layer by layer, and the improvement of impact resistance toughness is limited. The reason is that 1, the bonding force between the adjacent super-hard material layers is relatively weak, structural damage easily occurs, and the super-hard material layers are peeled off, and 2, the single fine-grain super-hard material layers still bear impact independently, or the structural damage easily occurs. Disclosure of Invention The invention aims to solve the problems and provide a superhard composite sheet with high impact toughness and a manufacturing method thereof. The technical scheme of the invention is that the high impact toughness superhard composite sheet comprises a plurality of superhard material layers and a hard alloy matrix which are integrated up and down; the super-hard material layer and the hard alloy matrix are sintered together at high pressure and high temperature, the super-hard material layer comprises a top super-hard material layer, a plurality of middle super-hard material layers and a bottom super-hard material layer which are mutually stacked, the top super-hard material layer is made of super-hard material micro powder with the smallest granularity and has the best wear resistance, the bottom super-hard material layer is made of super-hard material micro powder with the largest granularity and has the best impact toughness, the super-hard material micro powder granularity used for manufacturing the middle super-hard material layer is gradually increased between the top super-hard material layer and the bottom super-hard material layer, the super-hard material layer made of super-hard material micro powder with the small granularity has high wear resistance, the super-hard material layer made of super-hard material micro powder with the large granularity has high impact toughness, the super-hard material layer with the smallest granularity is subjected to cutting wear by the top super-hard material layer with the largest granularity, the bottom super-hard material layer with the largest granularity is uniformly distributed with grooves, the top super-hard material layer is the middle layer with the highest impact toughness, the super-hard material layer is formed by the middle layer, the super-hard material layer is in the middle layer and the super-hard material layer is in the proper shape, the super-hard material layer is matched with the bulge layer and the super-hard material layer and the bulge and the super-hard material layer, and the super-hard material layer is uniformly distributed on the top layer, and the super-hard material layer is matched with the bulge and the top layer, and the super-hard material layer is correspondingly provided with the bulge and the super-hard layer and the super-hard material layer, and the super-hard material layer is uniformly has the bulge and has the super-hard layer and has high wear resistance And the bulge B is inserted into the groove B of the middle layer super-hard material layer adjacent to the bottom layer super-hard material layer to connect the bottom layer super-