阅读说明：本技术 金属基复合材料 (Metal matrix composite material ) 是由 高山定和 梶田慎道 加来由纪惠 于 2018-04-19 设计创作，主要内容包括：本发明提供一种具有高硬度的金属基材。本发明的金属基复合材料的特征在于,由Ti原料粉末、Mo原料粉末、Ni原料粉末、陶瓷粉末得到的烧结体所构成,将整体设为100质量份时,含有0.1～9质量份的Ni。(The invention provides a metal base material having high hardness. The metal matrix composite material of the present invention is characterized by comprising a sintered body obtained from a Ti raw material powder, a Mo raw material powder, a Ni raw material powder, and a ceramic powder, and by containing 0.1 to 9 parts by mass of Ni, based on 100 parts by mass of the whole.)

1. A metal matrix composite material comprising a Ti raw material powder containing Ti, a Mo raw material powder containing Mo, a Ni raw material powder containing Ni, and a material selected from the group consisting of SiC, TiC and TiB₂And MoB, at least 1 kind of ceramic powder,

Ni is contained in an amount of 0.1 to 9 parts by mass based on 100 parts by mass of the whole.

2. The metal matrix composite according to claim 1, wherein the porosity is 0.5% or less.

3. The metal matrix composite according to claim 1, wherein a nitriding treatment is performed.

Technical Field

The present invention relates to a metal matrix composite.

Background

In recent years, in the fields of automobiles, industrial machines, household electric appliances, and the like, opportunities for using lightweight nonferrous metals such as aluminum have been increasing. Some nonferrous metals such as aluminum alloys are cast with high accuracy and high speed by a die casting technique (i.e., a die casting machine).

As described in patent document 1, a metal matrix composite material is sometimes used for an injection sleeve of a die casting machine. The metal matrix composite material is disposed in a portion that is in contact with the molten metal by means of a hot jacket or an internal chill.

disclosure of Invention

In the die casting machine, further improvement in durability is required for the injection sleeve using the metal matrix composite. In particular, the metal matrix composite is required to have high hardness.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a metal matrix composite material having high hardness.

The metal matrix composite material according to the present invention for solving the above problems is characterized by comprising a sintered body obtained from a Ti raw material powder containing Ti, a Mo raw material powder containing Mo, a Ni raw material powder containing Ni, and at least 1 ceramic powder selected from SiC, TiC, TiB2, and MoB, and 0.1 to 9 parts by mass of Ni is contained per 100 parts by mass of the whole.

According to the metal matrix composite material of the present invention, the hardness (and strength, abrasion resistance) is improved by the dense structure.

Drawings

FIG. 1 is an enlarged photograph of a cross section of sample 1 of the example.

FIG. 2 is an enlarged photograph of a cross section of sample 4 of the example.

FIG. 3 is an enlarged photograph of a cross section of sample 8 of the example.

FIG. 4 is an enlarged photograph of a cross section of sample 12 of the example.

Fig. 5 is a sectional view showing a structure of an injection sleeve of the die casting machine.

Fig. 6 is a sectional view taken along line VI-VI in fig. 5.

Detailed Description

The present invention will be specifically described below with reference to embodiments.

[ Metal-based composite Material ]

The metal matrix composite material of the present embodiment comprises a Ti raw material powder containing Ti, a Mo raw material powder containing Mo, a Ni raw material powder containing Ni, and a material selected from the group consisting of SiC, TiC and TiB₂And MoB, at least 1 kind of ceramic powder. Further, the metal matrix composite material contains 0.1 to 9 parts by mass of Ni per 100 parts by mass of the entire metal matrix composite material.

The metal matrix composite material of the present embodiment is composed of a sintered body. The sintered body is obtained by sintering a raw material powder. Since atoms of the raw material diffuse into the sintered body, the composition thereof cannot be similarly defined. That is, the sintered body of the present embodiment is composed of a Ti raw material powder containing Ti, a Mo raw material powder containing Mo, a Ni raw material powder containing Ni, and a material selected from SiC, TiC, and TiB₂And a sintered body composed of at least 1 kind of ceramic powder in MoB, the microstructure and properties thereof cannot be defined in the same manner.

The metal matrix composite material of the present embodiment is composed of a sintered body obtained from a Ti raw material powder, a Mo raw material powder, a Ni raw material powder, and a ceramic powder. The sintered body composed of these powders contains Ti and Mo, ceramic and Ni.

The Ti raw material powder is a powder of a compound containing Ti in its composition (an aggregate of compound particles). The Ti raw material powder is preferably a powder composed of (particles of) a compound containing Ti as the largest component, preferably a powder composed of (particles of) a compound containing Ti at 50 mass% or more, more preferably a powder composed of (particles of) a compound containing Ti at 90 mass% or more, and most preferably a powder composed of (particles of) Ti. The content ratio of these compounds is defined as a content ratio when the total mass of the Ti raw material powder is 100 mass%. The Ti raw material powder may be formed by combining (particles of) compounds having different Ti content ratios.

The Mo raw material powder is a powder of a compound containing Mo in its composition (an aggregate of compound particles). The Mo raw material powder is preferably a powder composed of (particles of) a compound containing Mo as the largest component, preferably a powder composed of (particles of) a compound containing Mo by 50 mass% or more, more preferably a powder composed of (particles of) a compound containing Mo by 90 mass% or more, and most preferably a powder composed of (particles of) Mo. The content ratio of these compounds is defined as the content ratio when the mass of the entire Mo raw material powder is 100 mass%. The Mo raw material powder may be formed by combining (particles of) compounds having different Mo content ratios.

The ceramic powder is made of SiC, TiC, TiB₂And MoB, at least 1 ceramic. The ceramic powder may be a powder of 1 kind of ceramic selected from them, or may be a mixed powder of powders of 2 or more kinds of ceramic selected from them. The ceramic powder may be a powder obtained by compositing 2 or more kinds of ceramics selected from these. The ratio of the ceramic powder composed of 2 or more selected from them is not limited.

The Ni raw material powder is a powder of a compound (an aggregate of compound particles) containing Ni in its composition. The Ni raw material powder is preferably a powder composed of (particles of) a compound containing Ni as the largest component, preferably a powder composed of (particles of) a compound containing 50 mass% or more of Ni, more preferably a powder composed of (particles of) a compound containing 90 mass% or more of Ni, and most preferably a powder composed of (particles of) Ni. The content ratio of these compounds is defined as the content ratio when the mass of the entire Ni raw material powder is 100 mass%. The Ni raw material powder may be formed by combining (particles of) compounds having different Ni content ratios.

The Ti raw material powder, the Mo raw material powder, and the Ni raw material powder may be alloyed with other elements of Ti, Mo, and Ni. For example, a Ti-Mo alloy is mentioned.

The metal matrix composite material of the present embodiment contains 0.1 to 9 parts by mass of Ni based on 100 parts by mass of the entire material. Here, the mass part of Ni corresponds to a ratio of the total mass of Ni contained in the metal matrix composite material. That is, it can be converted to mass% (mass%).

Ni densifies the structure of the metal matrix composite. As the structure densifies, the overall stiffness and strength increases. That is, the wear resistance of the metal matrix composite material can be improved by containing Ni.

The effect of improving the wear resistance can be reliably exhibited by containing 0.1 to 9 parts by mass of Ni. When the amount is less than 0.1 part by mass, the amount of Ni incorporated is too small, and the effect of incorporation cannot be sufficiently exhibited. If it exceeds 9 parts by mass, the metal matrix composite becomes brittle. Namely, the bending resistance is lowered.

The preferable Ni content is 0.1 to 5 parts by mass for 100 parts by mass of the entire metal matrix composite. More preferably, the content is 0.5 to 3 parts by mass.

The metal matrix composite material of the present embodiment contains Ti contained in the Ti raw material powder and Mo contained in the Mo raw material powder. Further, the ceramic powder contains a ceramic contained therein.

Ti forms a matrix in the metal matrix composite of the present embodiment. In the metal matrix composite material according to this embodiment, the Ti matrix has excellent erosion resistance to the molten metal other than the ferrous metal. In addition, the temperature retention ability is also excellent due to the low thermal conductivity.

Mo improves the melting loss resistance. In particular, the melting loss resistance of nonferrous metals is improved. That is, by containing Mo, the metal matrix composite material has improved resistance to melting loss of the nonferrous metal.

Mo is disposed in a Ti-rich state. The Ti-rich state is a state in which Ti is much in mass when Ti and Mo are compared. The preferable proportion is that the mass of Mo is 10-50 parts by mass when Ti is 100 parts by mass. The content ratio is more preferably 20 to 40 parts by mass.

The strength and hardness of the ceramic are excellent. In the sintered body of the metal matrix composite material, the ceramic has a structure in which particles derived from the raw material powder are dispersed in the matrix. The ceramic improves the strength and hardness of the metal matrix composite. The ceramic further increases the sinterability, and therefore contributes to an increase in the strength and hardness of the metal matrix composite material.

The ceramic composition contains 1 to 15 parts by mass of ceramic, thereby exhibiting the effects of high strength and high hardness. If the amount is less than 1 part by mass, the amount of the ceramics added is too small, and the effect of the addition cannot be sufficiently exhibited. That is, the hardness and wear resistance of the metal matrix composite material become low. If the amount exceeds 15 parts by mass, the metal matrix composite becomes brittle, resulting in a decrease in impact resistance. Since the impact resistance is lowered, the metal matrix composite becomes easily cracked.

The mixing ratio of the ceramic is preferably 1 to 15 parts by mass, based on 100 parts by mass of the total of Ti and Mo. More preferably 3 to 10 parts by mass.

The metal matrix composite of the present embodiment preferably has a porosity of 0.5% or less. As described above, the metal matrix composite material of the present embodiment is a sintered body having a dense structure. Further, by setting the porosity to 0.5% or less, a more dense sintered body having excellent hardness and strength is obtained. The porosity is more preferably 0.3% or less, and still more preferably 0.15% or less.

The metal matrix composite material of the present embodiment is preferably subjected to nitriding treatment. That is, the surface of the film preferably has a nitrided coating. The nitrided coating film formed by the nitriding treatment has high hardness. As a result, the surface hardness of the metal matrix composite material of the present embodiment is increased.

As described above, the metal matrix composite material of the present embodiment has a structure itself having high hardness. The surface of the steel sheet has a nitrided coating. That is, by performing the nitriding treatment, the metal matrix composite material has higher hardness than a metal matrix composite material that has not been subjected to the nitriding treatment.

In addition, the metal matrix composite material of the present embodiment has a lower hardness-improving effect by nitriding treatment than the case of nitriding a conventional sintered body. This is because the metal-matrix composite material of the present embodiment has a structure densified by Ni contained therein, and thus the nitriding reaction hardly proceeds from the surface of the raw powder particles toward the inside. However, since the metal matrix composite material of the present embodiment has high hardness due to densification and the sintered body itself, the metal matrix composite material has high hardness even if the nitrided coating on the surface is lost or the effect of nitriding is low.

The method for producing the metal matrix composite material of the present embodiment is not limited. For example, the powder can be produced by performing a step of mixing the raw material powders and a step of heating and sintering the mixed powder. The step of molding the mixed powder into a predetermined shape, and the step of heating the sintered body in a nitrogen atmosphere, that is, the step of performing nitriding treatment may be further performed. The shaping step may be performed before the nitriding treatment or after the nitriding treatment.