Unlock instant, AI-driven research and patent intelligence for your innovation.

Ti(C,N) based metal ceramic nitrogen atmosphere sintering process

A nitrogen atmosphere and base metal technology is applied in the field of preparation of Ti-based cermets, which can solve the problems of limited improvement in fracture toughness, and achieve the effects of improved mechanical properties and excellent comprehensive mechanical properties.

Active Publication Date: 2020-05-26
宜昌永鑫精工科技股份有限公司 +1
View PDF9 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, in addition to introducing a single nitrogen atmosphere, there are other atmosphere sintering processes, such as using a mixed atmosphere of nitrogen and argon, and argon is used as a diluent gas, but the degree of improvement in fracture toughness is limited

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ti(C,N) based metal ceramic nitrogen atmosphere sintering process
  • Ti(C,N) based metal ceramic nitrogen atmosphere sintering process
  • Ti(C,N) based metal ceramic nitrogen atmosphere sintering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example describes the preparation method of Ti(C,N)-based cermet and the effect produced by the implementation of this case. In this example, the nitrogen atmosphere sintering pressure range is 25-200Pa, and the raw materials used for Ti(C,N)-based cermets are TiC powder, TiN powder, WC powder and Ni powder, and the composition is shown in Table 1. The characteristic of the cermet composition of this embodiment is that only one secondary carbide WC component is compounded.

[0030] The cermet composition / mass percentage ratio % of table 1 embodiment 1

[0031]

[0032] The process steps are as follows:

[0033] (1) Mixing and granulation

[0034] Implementation sequence: configure 500g of mixed powder. Weigh the cemented carbide ball according to the mass ratio of the grinding ball and the mixed powder at a ratio of 5:1, measure the industrial alcohol according to the slurry with a solid and liquid concentration ratio of 60%, and weigh the polyethylene glycol...

Embodiment 2

[0049] This example describes the preparation method of Ti(C,N)-based cermet and the effect produced by the implementation of this case. In this embodiment, the nitrogen atmosphere sintering pressure range is 50-600Pa, and the raw materials used for Ti(C,N)-based cermets are TiC powder, TiN powder, Mo 2 The composition of C powder and Ni powder is shown in Table 3. The characteristic of the composition of the cermet in this embodiment is that only one secondary carbide Mo is compounded. 2 C component.

[0050] The process steps are as follows:

[0051] (1) Mixing and granulation

[0052] Implementation sequence: configure 500g of mixed powder. Weigh the cemented carbide ball according to the mass ratio of the grinding ball and the mixed powder at a ratio of 5:1, measure the industrial alcohol according to the slurry with a solid and liquid concentration ratio of 60%, and weigh the polyethylene glycol with a mass of 4% of the mixed powder. Alcohol (PEG, molecular weight 40...

Embodiment 3

[0070] In this embodiment, the nitrogen atmosphere sintering pressure range is 10-1000Pa, and the raw materials used for Ti(C,N)-based cermets are TiC powder, TiN powder, WC powder, Mo 2 The composition of C powder and Ni powder is shown in Table 5. The characteristics of the composition of this example are that TiC and TiN are used to form the hard phase raw materials. During sintering, the two react to form the Ti(C,N) hard core phase, or the two are combined with secondary carbides, such as WC, Mo 2 C, the reaction forms (Ti, W, Mo) (C, N) annular phase. Simultaneously complex secondary carbides WC and Mo 2 C, on the one hand using WC and Mo 2 C improves the wettability of the metal binder phase Ni and the hard phase, and improves the sinterability of the cermet. On the other hand, WC and Mo 2 C is a conventional component for Ti(C,N)-based cermet applications.

[0071] The cermet composition / mass percentage ratio % of table 5 embodiment 3

[0072]

[0073] The proc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a Ti(C,N) based metal ceramic nitrogen atmosphere sintering process. TiN, TiC, WC, Mo2C, Ni and other raw material powder are mixed with ethyl alcohol, polyethylene glycol andhard alloy grinding balls on a planetary ball grinder, after drying, granulating, pressing forming and degreasing, an obtained degreased pressing blank is placed in a vacuum sintering furnace to be sintered, and is heated to 1100 to 1150 DEG C from the room temperature at the temperature rise rate of 5 DEG C / min, slowly heated to 1150 to 1400 DEG C at the temperature rise rate of 1 DEG C / min, andheated to 1430 to 1480 DEG C at the temperature rise rate of 2 DEG C / min, at the temperature of 1430 to 1480 DEG C, sintering is carried out for one hour, when the temperature reaches 1320 DEG C, nitrogen is introduced into the sintering furnace, the pressure range ranges from 100 to 103 Pa, sintering is finished, when the blank is cooled to 800 DEG C at the cooling rate of 6 DEG C / min, introducing of the nitrogen is stopped, and the vacuum environment in the sintering furnace is recovered. Through improving of the nitrogen introducing temperature and reducing of nitrogen atmosphere pressure,the problems that in the prior art, Ti(C,N) based metal ceramic cannot consider fracture toughness (KIC) and hardness (HV30) in the aspect of mechanical property improvement, and the improvement of the mechanical property is limited can be solved, and the application range of the Ti(C,N) based metal ceramic in the metal cutting field can be widened.

Description

technical field [0001] The invention belongs to cermet composite materials, in particular to a preparation method and components of Ti(C,N)-based cermet. [0002] technical background [0003] TiC, TiN and Ti(C,N) compounds have very high hardness and wear resistance, and cermets composed of TiC, TiN or Ti(C,N) and metal Ni, Co or mixtures also inherit this property. It also has relatively high hardness and wear resistance. This material, called Ti(C,N)-based cermet, has been used in metal cutting tools, but the high brittleness of Ti(C,N)-based cermet restricts its application under impact load conditions. In order to improve the mechanical properties of Ti(C,N)-based cermets, especially the fracture toughness, the existing technology mainly uses two technologies: 1) compounding secondary carbides on the components, such as WC, Mo 2 C, (Ti,Me)C, etc., Me=W, Mo, Ta, Nb, V, etc., adopt vacuum sintering technology to change the core phase, inner ring phase, outer ring phase a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10C22C1/05C22C1/10C22C29/02C22C30/00
CPCB22F3/101B22F3/1035C22C1/051C22C29/02C22C29/005C22C30/00
Inventor 汪万勇丰平郑腾标
Owner 宜昌永鑫精工科技股份有限公司