CN-121589289-B - Metal ceramic composite material with complete core ring structure, preparation method and application

CN121589289BCN 121589289 BCN121589289 BCN 121589289BCN-121589289-B

Abstract

The invention provides a metal ceramic composite material with a complete core ring structure, a preparation method and application thereof. The preparation method comprises the steps of forming ceramic phase pre-solid solution powder which has a single-phase structure and does not contain oxide, ball-milling and mixing the ceramic phase pre-solid solution powder, second refractory metal carbide ceramic powder and metal bonding phase powder, enabling the second refractory metal to be different from the first refractory metal, pressing into a blank, and sequentially performing vacuum sintering, partial pressure sintering and cooling to obtain the metal ceramic composite material. The method utilizes the synergistic combination of the modification of the ceramic phase and the sintering process to generate a complete core ring structure, effectively improves the interface bonding strength and reduces the loss of mechanical properties of materials caused by uneven microstructure.

Inventors

CHANG KEKE
Kan Gaohui
LOU MING
Jia Qingtao
LV JIAN
XU KAI
REN HUI
LIU YANYU

Assignees

中国科学院宁波材料技术与工程研究所

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (7)

1. A method for preparing a cermet composite having a complete core ring structure comprising: Ball-milling and mixing a multi-component ceramic phase material, performing heat treatment at a first temperature, and then performing crystallization treatment at a second temperature to form ceramic phase pre-solid solution powder (Ti 1-x ,M x ) C (N), wherein the value of x is in the range of 0.03-0.5, the first temperature is 1400-1600 ℃, the second temperature is 1800-2200 ℃, the ceramic phase pre-solid solution powder (Ti 1-x ,M x ) C (N) has a single-phase structure and does not contain oxide, M represents a first refractory metal element, and (N) represents an optional N element; The ceramic phase pre-solid solution powder (Ti 1-x ,M x ) C (N), second refractory metal carbide ceramic powder and metal binding phase powder are ball-milled and mixed to obtain mixed powder, wherein the second refractory metal in the second refractory metal carbide ceramic powder and the first refractory metal are independently and non-overlapped any one or more than two of W, mo, ta, nb, V, zr, the mass fraction of the ceramic phase pre-solid solution powder (Ti 1-x ,M x ) C (N) is 60-80%, the mass fraction of the second refractory metal carbide ceramic powder is 10-20%, and the mass fraction of the metal binding phase powder is 10-20%; And pressing the mixed powder into a green body, and sequentially performing vacuum sintering, partial pressure sintering and cooling to obtain the metal ceramic composite material with the complete core ring structure, wherein the temperature of the vacuum sintering and the partial pressure sintering is 1400-1500 ℃, the time of the vacuum sintering is 1-2.5 h, the time of the partial pressure sintering is 0.5-2 h, and the total duration of the vacuum sintering and the partial pressure sintering is controlled below 3 hours.
2. The method of claim 1, wherein the multicomponent ceramic phase material comprises: The combination comprises TiO 2 , oxide powder of the first refractory metal and elemental carbon; or, in combination two, carbide powder comprising TiC, the first refractory metal, optionally with or without TiN; Or a mixture of said combination one and said combination two.
3. The method according to claim 1, wherein the material of the metal binder phase powder comprises any one or a combination of two or more kinds of Ni, co, al, mo.
4. The method according to claim 1, wherein the partial pressure sintering atmosphere is inert gas at a pressure of 40 to 70 MPa.
5. The method according to claim 1, wherein the ball-milling mixing mode is wet high-energy ball milling, the ball milling rotating speed is 250-400 rpm, the ball milling time is 20-30 h, the ball material ratio is 8:1-15:1, the ball milling medium comprises absolute ethyl alcohol, drying is carried out after ball milling mixing to remove the ball milling medium, and the mixed powder is pressed into a green body with the pressure of 120-250 MPa.
6. The cermet composite of any of claims 1-5 comprising a ceramic phase and a binder phase, the ceramic phase comprising a core phase and a ring phase, the ring phase completely surrounding the core phase; The core phase is made of (Ti 1-x ,M x ) C (N), wherein M represents the first refractory metal, and the annular phase is a solid solution formed by (Ti 1-x ,M x ) C (N) and carbide of the second refractory metal.
7. Use of the cermet composition of claim 6 in machining, oil drilling applications.

Description

Metal ceramic composite material with complete core ring structure, preparation method and application Technical Field The invention belongs to the technical field of metal ceramic composite materials, and particularly relates to a metal ceramic composite material with a complete core ring structure, a preparation method and application. Background Cermet composites have been widely used, for example, in centralizers and radial bearings for oil drilling to improve wear resistance and extend the service life of drilling tool components. In a cermet composite, ceramic phase particles provide primarily strength and hardness, and binder phase provides primarily plasticity and deformability. In recent years, attention has been paid to the replacement of WC-Co cemented carbide as a lightweight, cost-effective TiC (N) -based cermet material. Compared with WC-based hard alloy, the TiC (N) ceramic phase particles and the binding phase (Co or Ni) have poor wettability, the bonding strength of the TiC (N) ceramic particles and the binding phase is not high, the toughness and strength of TiC (N) base metal ceramic prepared directly from TiC (N) and Co or Ni are low, the bending strength of the TiC (N) base metal ceramic is only about 70% of that of the corresponding WC-Co hard alloy, and the development of the TiC (N) base metal ceramic in the field of machining and the application scene expansion of the TiC (N) base metal ceramic are greatly limited. The synergistic improvement of the toughness of the cermet is a long-standing research target, and the improvement of the wettability between ceramic phase particles and a binding phase (Co or Ni) is one of important ways for improving the mechanical property and the service property of the cermet material. The second type of carbide, mo 2 C, WC, taC, etc., is typically added during cermet preparation, and is preferentially dissolved during liquid phase sintering due to its lower thermodynamic stability than TiC (N), followed by the formation of a ring-shaped (Ti, W, mo.) C (N) solid solution around the undissolved ceramic particles during cooling. The forming of the core ring structure can effectively improve wettability, promote density and reduce porosity, thereby improving material performance. The morphology and the components of the metal ceramic core ring structure mainly depend on the dissolution and re-precipitation process of sintering, however, the full regulation and control of the dissolution and precipitation process is difficult to realize only by optimizing the sintering process, and the problems of incomplete core ring structure, uneven core ring interface structure and the like of the metal ceramic sintered by the prior art, namely the phenomenon that part of the core is directly contacted with a metal bonding phase, reduce the performance of the metal ceramic composite material, and cannot fully exert the benefit brought by the improvement of wettability of the core ring structure. Disclosure of Invention The invention mainly aims to provide a metal ceramic composite material with a complete core ring structure, a preparation method and application thereof, so as to overcome the defects of the prior art. In order to achieve the above object, the present invention adopts the following technical scheme: in a first aspect, the present invention provides a method of preparing a cermet composite having a complete core ring structure comprising: Ball-milling and mixing a multi-component ceramic phase material, performing heat treatment at a first temperature, and then performing crystallization treatment at a second temperature to form ceramic phase pre-solid solution powder (Ti 1-x,Mx) C (N), wherein the second temperature is higher than the first temperature, the ceramic phase pre-solid solution powder (Ti 1-x,Mx) C (N) has a single-phase structure and does not contain oxide, M represents a first refractory metal element, and (N) represents an optional N element; ball-milling and mixing the ceramic phase pre-solid solution powder (Ti 1-x,Mx) C (N), the second refractory metal carbide ceramic powder and the metal binding phase powder to obtain mixed powder, wherein the second refractory metal in the second refractory metal carbide ceramic powder is different from the first refractory metal; and pressing the mixed powder into a green body, and sequentially performing vacuum sintering, partial pressure sintering and cooling to obtain the metal ceramic composite material with the complete core ring structure. In a second aspect, the present invention provides a cermet composite prepared by the above-described method comprising a ceramic phase comprising a core phase and a ring phase, the ring phase completely surrounding the core phase; The core phase is made of (Ti 1-x,Mx) C (N), wherein M represents the first refractory metal, and the annular phase is a solid solution formed by (Ti 1-x,Mx) C (N) and carbide of the second refractory metal. In a third aspect, t