JPH0331441A - Ceramics dispersion-type metallic composite sintered compact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a ceramic-dispersed metal-based composite sintered body, which is lightweight, has a blue specific strength, and has a blue surface that can be applied to parts that are driven at high speed and require wear resistance. The purpose of this is to provide a ceramic-dispersed metal-based composite sintered body that does not require treatment, in which particles of boron nitride ceramics are dispersed in a matrix of titanium or titanium alloy, and the titanium in the matrix and the dispersed particles are dispersed. It is constructed so as to contain titanium nitride and/or titanium boride, which are compounds with nitrogen or boron, which are components of.

[Industrial application field]

The present invention relates to a ceramic-dispersed metal-based composite sintered body.

[Conventional technology]

Currently, there is a growing demand for smaller and lighter terminal devices in computers and their peripheral devices, and aluminum-based materials are being used to reduce the weight of various mechanical parts. However, since aluminum-based materials do not have sufficient wear resistance, currently heavy iron-based and bronze-based materials are still used, for example, in bearings that drive at high speeds. An example of an aluminum-based material is a sintered body in which aluminum nitride is dispersed in an aluminum matrix, but as described above, it has low wear resistance and poor mechanical strength.

On the other hand, titanium is the second lightest practical metal after aluminum, and has a higher specific strength than iron. but,
Due to poor heat conduction, galling and seizure are likely to occur when applied to members that slide.

For this reason, surface treatment is required when applying it to members that require wear resistance.

[Problem to be solved by the invention]

An object of the present invention is to provide a ceramic-dispersed metal-based composite sintered body that is lightweight, has high specific strength, and does not require surface treatment, and can be applied to members that are driven at high speed and require wear resistance. .

[Means to solve the problem]

According to the present invention, particles of boron nitride ceramics are dispersed in a matrix of titanium or a titanium alloy, and a compound of titanium in the matrix and nitrogen or boron as a component of the dispersed particles. This is achieved by a ceramic-dispersed metal-based composite sintered body characterized by containing certain titanium nitride and/or titanium boride.

The composite sintered body of the present invention can be manufactured as follows. Ti
The powder and BN powder are mixed, compacted, and then sintered in an inert gas or vacuum.

During the sintering process, the Ti part and the BN part react with each other at the interface to generate titanium nitride and titanium boride, which causes boron nitride particles to be dispersed in the titanium matrix and to form titanium nitride and titanium boride. A composite sintered body containing the above is obtained.

This ceramic dispersed metal sintered composite has a hard compound layer and BN, which acts as a lubricant, dispersed in the Ti matrix, so it has excellent wear resistance without galling or seizing due to Ti alone, and is lightweight. - Ideal for high-strength, high-speed bearings, etc.

The mixing ratio of the metal powder that becomes the matrix and the ceramic powder that becomes the dispersed particles is such that the matrix metal forms a continuous phase, and the ceramic powder and the sintering product compound are 10 to 20 vol. The range can be determined depending on the application. If the ceramic powder is less than 1% lQvo, the required wear resistance cannot be imparted, and if it is more than 1% 20VO, the matrix will not form a continuous phase.

〔Example〕

Particle size - 350 mesh x T as powder powder, average particle size 0
．． Prepare 6s BN powder, mix them so that the Ti powder becomes 90 VO 1% and the BN powder becomes 10 VO 1%,
This powder was press-molded into a disc shape of φ20×5 plate under the conditions of 2.5 ton/(j). Next, this molded sample was held in a vacuum of 10-' Torr at 1000° C. for sintering. When the composition of the sintered body was identified by micro BX-ray diffraction, in addition to the peaks of Ti and BN, titanium nitride,
A peak for titanium boride was also confirmed. From this sample φ2
When a bush of 0/10 x 3 aluminum was made and its wear resistance was evaluated, it was confirmed that it could be used satisfactorily without galling or seizing, which is characteristic of Ti.

Using the above raw material powder, the composition was 75vol% Ti powder,
When both were mixed so that the BN powder was 25vol% and sintered under the same conditions as above, the matrix became discontinuous and brittle, and could not be processed into a bush.

Using the above raw material powder, the composition was 95vol 1% Ti powder,
When the two were mixed so that the BN powder was 5 vol % and sintered under the same conditions as above, the wear resistance was insufficient, and the burnout characteristic of T1 occurred.

〔Effect of the invention〕

As explained above, according to the present invention, ceramics such as BN, which serve as a hard compound phase and a lubricant, are dispersed in a metal matrix such as Ti, so that if a single metal such as Ti is used, it will not seize. The result is a ceramic-dispersed metal composite sintered body that is lightweight, has excellent wear resistance, is lightweight and has high strength, and is ideal for high-speed bearings.
This greatly contributes to weight reduction.

Claims (1)

[Claims] 1. Titanium nitride and/or titanium boride, in which particles of boron nitride ceramics are dispersed in a matrix of titanium or titanium alloy, and are a compound of titanium in the matrix and nitrogen or boron, which is a component of the dispersed particles. A ceramic-dispersed metal-based composite sintered body characterized by containing.