CN102051535B - Damping abrasion resistant magnesium alloy material and preparation method thereof - Google Patents

Abstract

The invention discloses a damping and wear-resistant magnesium alloy material and a preparation method thereof. The material uses a magnesium alloy as a matrix, and steel wire clusters and carbon fibers are distributed in the base body; the diameter of the steel wire clusters is 10-15 cm, and the cross-section of the steel wires used is rectangular , the cross-sectional specification is 0.1-0.4mm×0.5-1.5mm; the weight ratio of the steel wire and the carbon fiber is 25-30:1, and the volume percentage of the steel wire and the carbon fiber is 20-40% of the material. The magnesium alloy material prepared by the invention has high toughness and wear resistance, simple process and low production cost.

Description

A kind of damping wear-resistant magnesium alloy material and preparation method thereof

technical field

The invention belongs to the field of metal materials, and in particular relates to a steel wire and carbon fiber composite reinforced damping wear-resistant magnesium alloy material and a preparation method thereof.

Background technique

In the field of metal materials, damping and wear-resistant magnesium alloys have been widely valued as wear-resistant materials.

Quan Jun and other foundry technology studied the magnesium alloy microstructure and properties of magnesium alloy AZ31 in the 9th issue of 2010. Zhao Xu and other materials engineering journals published a study on the wear properties of magnesium alloy AZ31 in the fifth issue of 2008. The as-cast magnesium alloy AZ31 is composed of the matrix phase α-Mg and the second phase Mg ₁₇ A1 ₁₂ , the content of the second phase is small and distributed in the matrix in granular form. The wear mass loss of the specimen increases linearly with the increase of wear time under different loads. In different load ranges, the change rate of wear mass loss is different, among which the rate of wear mass loss is lower in the range of 50-75N, and the rate of wear mass loss in the range of 75-100N is the largest. The increase of load makes the loss of wear mass more significant, and the wear form changes from oxidative wear to abrasive wear and then to spalling wear, and the wear becomes more and more serious. The wear resistance of ordinary magnesium alloy is not high.

CN200910023238.5 relates to a high-damping magnesium alloy containing quasi-crystal reinforcement phase and its preparation method, its alloy composition and weight percentage are: 0.9%-1.0% zinc, 0.15%-0.2% yttrium, 0.6% zirconium . Magnesium and zinc are both industrial pure magnesium and industrial pure zinc; alloy elements yttrium and zirconium are added in the form of magnesium-30% yttrium and magnesium-30% zirconium master alloys respectively; through preheating, smelting and forming, a quasi-crystalline reinforcement is prepared Phase high damping magnesium alloy. However, the wear resistance of the material is insufficient.

Contents of the invention

The object of the present invention is to provide a steel wire and carbon fiber composite reinforced damping and wear-resistant magnesium alloy material for the above-mentioned technical defects.

Another object of the present invention is to provide a method for preparing a steel wire and carbon fiber composite reinforced damping and wear-resistant magnesium alloy material.

The purpose of the present invention is achieved through the following technical solutions:

A damping and wear-resistant magnesium alloy material, the material uses a magnesium alloy as a matrix, and steel wire clusters and carbon fibers are distributed in the matrix; the diameter of the steel wire clusters is 10-15 cm, and the cross-section of the steel wire used is rectangular, and the cross-sectional specification is 0.1-0.4 mm ×0.5～1.5mm; the weight ratio of the steel wire and the carbon fiber is 25～30:1, and the volume percentage of the steel wire and the carbon fiber is 20～40%;

The weight percentage of the chemical composition of the magnesium alloy matrix: Al is 10% to 12%, Sr is 0.2% to 0.5%, Si is 2% to 3%, Zr is 0.2% to 0.8%, and Fe is 1% to 2%. %, Gd is 0.5% to 1%, Ho is 0.01% to 0.03%, and the rest is Mg;

The weight percentage of the chemical composition of the steel wire is: C is 0.45%~0.65%, Si is 0.2%~0.3%, Mn is 0.25%~0.35%, P<0.02%, S<0.025%, and the rest is Fe;

The carbon fiber is T300, with a diameter of 7 microns and an aspect ratio of 100-500:1.

Mg ₂ Ni and Ni ₃ Al particles are also distributed in the above matrix.

A method for preparing a damping and wear-resistant magnesium alloy material, comprising the following steps:

Preparation of nickel-plated steel wire and carbon fiber: the cross-section is rectangular, and the specification is 0.1-0.4mm×0.5-1.5mm, and the composition is 0.45%-0.65% for C, 0.2%-0.3% for Si, and 0.25%- 0.35%, P<0.02%, S<0.025%, the rest is Fe steel wire, and T300 carbon fiber with a diameter of 7 microns and an aspect ratio of 100 to 500:1; the weight ratio of the steel wire to carbon fiber is 25 to 30 : 1, the volume percentage of both steel wire and carbon fiber accounts for 20-40% of the material; get the steel wire and prepare a clean spherical steel wire group according to the conventional method of cleaning ball production. Nickel-plating on its surface to obtain a nickel-plated steel wire ball, the thickness of the nickel-plated layer is 50-100 μm;

Preparation of nickel-plated steel wire balls adhered to carbon fibers: immerse nickel-plated steel wire balls in water glass solution, the concentration of water glass solution is 1.3-1.5 g/cm ³ , and the modulus is 2.6-3.0; take out the steel wire balls from the water glass solution , and then sprinkle the carbon fibers onto the steel wire balls with water glass solution, so that the carbon fibers evenly stick to the surface of the steel wires; after the water glass solidifies, put some steel wire balls with carbon fibers into the mold cavity; The degree of tightness is determined by the volume percentage of steel wire and carbon fiber in the material, and it is ensured that the steel wire cluster is just filled with the mold; then the upper mold of the mold is covered on the lower mold, and the magnesium alloy water is poured after the box is closed;

Preparation of magnesium alloy matrix: Al is 10% to 12% by weight, Sr is 0.2% to 0.5%, Si is 2% to 3%, Zr is 0.2% to 0.8%, and Fe is 1% to 2%. , Gd is 0.5% to 1%, Ho is 0.01% to 0.03%, and the rest is Mg for batching; the magnesium alloy substrate is melted in an induction furnace to obtain magnesium alloy water, and the melting temperature is 700-720°C;

The above-mentioned magnesium alloy water is poured into the casting mold equipped with steel wire clusters adhering to carbon fibers, and the liquid magnesium alloy water enters the gap between the steel wire clusters to surround the carbon fibers and steel wires, and then cools and solidifies to form a magnesium alloy matrix in which carbon fibers and steel wires are distributed. The material of the wire ball.

The beneficial effects of the present invention compared with prior art are as follows:

(1) The steel wire itself in the material of the present invention has considerable strength and high toughness. Because iron and magnesium have a certain solubility in each other, steel wire and magnesium alloy are easily combined to form a good metallurgical bond. In this way, the steel wire is distributed in the magnesium alloy, which has a good strengthening and toughening effect on the material, and at the same time, the steel wire has a high carbon content and has a wear-resistant effect.

(2) Carbon fiber is distributed in the material. Carbon fiber not only has the effect of reducing friction, but also works together with steel wire to enhance the toughness and strength of the material, which is beneficial to the improvement of the wear resistance of the alloy.

(3) During the material forming process, when the magnesium alloy water enters the mold cavity and contacts the nickel-plated steel wire, the nickel on the surface of the steel wire melts in the magnesium alloy water to form Mg ₂ Ni, and the Al in the magnesium alloy water reacts with the Ni on the surface of the steel wire to form A small amount of special compound of Ni ₃ Al with high hardness, the two compounds are dispersed in the matrix, which further improves the wear resistance of the material.

(4) In addition, the cross-section of the steel wire in the material is rectangular and contains fine carbon fibers, so there are many interfaces in the alloy and the surface area is large. The material has good damping and vibration reduction performance; And the carbon fibers attached to it are evenly distributed in the material.

(6) Part of the magnesium is replaced by iron in the alloy material, the material cost is low, the preparation process is simple, the production cost is low, the performance of the produced alloy material is good, and it is very convenient for industrial production.

(7) P and S in the material of the present invention are impurities, which should be controlled within the allowable range. Alloy properties of the present invention are shown in Table 1.

Description of drawings

Fig. 1 is the metallographic structure of the steel wire and carbon fiber composite reinforced damping and wear-resistant magnesium alloy material prepared in Example 1 of the present invention.

Figure 1 shows that the magnesium alloy is well combined with the steel wire.

Detailed ways

The following examples are only used to illustrate the present invention, and the weight percentages can be replaced by weight g, kg or other weight units. The steel wires and carbon fibers in each embodiment are commercially available, and the nickel-plated layer is self-made.

Embodiment one

The weight percentage of the chemical composition of the magnesium alloy matrix: Al is 10%, Sr is 0.2%, Si is 2%, Zr is 0.2%, Fe is 1%, Gd is 0.5%, Ho is 0.01%, and the rest is Mg .

The weight percentage of the chemical composition of the steel wire is: C is 0.45%, Si is 0.2%, Mn is 0.25%, P<0.02%, S<0.025%; the cross section of the steel wire is rectangular, and the specification is 0.1mm×0.5mm .

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 100:1.

The weight ratio of the steel wire and the carbon fiber is 25:1, and the volume percentage of the control steel wire and the carbon fiber is 20% of the material.

Get steel wire and prepare clean spherical steel wire group by the conventional method of cleaning ball production, the diameter of steel wire group is 10cm, and obtain nickel-plated steel wire group at its surface nickel-plated according to conventional method, the thickness of described nickel-plated layer is 50 μ m.

The preparation process is as follows: immerse the nickel-plated steel wire ball into the water glass solution, the concentration of the water glass solution is 1.3 g/cm ³ , and the modulus is 2.6; the steel wire ball is taken out of the water glass solution, and then the carbon fiber is kneaded and sprinkled on the On the steel wire ball of the water glass solution, the carbon fiber is evenly adhered to the surface of the steel wire; after the water glass is solidified, put some steel wire balls with carbon fiber into the mold cavity; the tightness of the steel wire ball is determined by the proportion of the steel wire and carbon fiber Determine the volume percentage, and ensure that the steel wire ball is just filled with the mold; then cover the upper mold of the mold on the lower mold, and wait for the magnesium alloy water to pour after the box is closed;

Melting the magnesium alloy matrix in an induction furnace to obtain magnesium alloy water, the melting temperature is 705-715°C;

The above-mentioned magnesium alloy water is poured into the casting mold equipped with steel wire clusters adhering to carbon fibers, and the liquid magnesium alloy water enters the gap between the steel wire clusters to surround the carbon fibers and steel wires, and then cools and solidifies to form a magnesium alloy matrix in which carbon fibers and steel wires are distributed. The material of the wire ball.

Embodiment two

The weight percentage of the chemical composition of the magnesium alloy matrix: Al is 12%, Sr is 0.5%, Si is 3%, Zr is 0.8%, Fe is 2%, Gd is 1%, Ho is 0.03%, and the rest is Mg .

The weight percentage of the chemical composition of the steel wire is: C is 0.65%, Si is 0.3%, Mn is 0.35%, P<0.02%, S<0.025%; the cross section of the steel wire is rectangular, and the specification is 0.4mm×1.5mm .

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 400:1.

The weight ratio of steel wire and carbon fiber is 30:1, and the volume percentage of the control steel wire and carbon fiber is 40% of the material.

Get steel wire and prepare clean spherical steel wire group by the conventional method of cleaning ball production, the diameter of steel wire group is 15cm, and obtain nickel-plated steel wire group at its surface nickel-plated according to conventional method, the thickness of described nickel-plated layer is 100 μ m.

The preparation process is the same as in Example 1, wherein the concentration of the water glass solution is 1.5 g/cm ³ and the modulus is 3.0.

Embodiment three

The weight percentage of the chemical composition of the magnesium alloy matrix: Al is 11%, Sr is 0.3%, Si is 2.5%, Zr is 0.5%, Fe is 1.5%, Gd is 0.7%, Ho is 0.02%, and the rest is Mg .

The weight percentage of the chemical composition of the steel wire is: C is 0.5%, Si is 0.25%, Mn is 0.3%, P<0.02%, S<0.025%; the cross section of the steel wire is rectangular, and the specification is 0.3mm×0.7mm .

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 190:1.

The weight ratio of steel wire and carbon fiber is 27:1, and the volume percentage of the control steel wire and carbon fiber is 35% of the material.

Get steel wire and prepare clean spherical steel wire group by the conventional method of cleaning ball production, the diameter of steel wire group is 12cm, and obtain nickel-plated steel wire group at its surface nickel-plated according to conventional method, the thickness of described nickel-plated layer is 70 μ m.

The preparation process is the same as in Example 1, wherein the concentration of the water glass solution is 1.4 g/cm ³ and the modulus is 2.8.

Comparative Example Four

The weight percentage of the chemical composition of the magnesium alloy matrix: Al is 8%, Sr is 0.1%, Si is 1%, Zr is 0.1%, Fe is 0.5%, Gd is 0.3%, Ho is 0.005%, and the rest is Mg .

The weight percentage of the chemical composition of the steel wire is: C is 0.3%, Si is 0.1%, Mn is 0.2%, P<0.02%, S<0.025%; the cross section of the steel wire is circular and the radius is 0.1mm.

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 50:1.

The weight ratio of the steel wire and the carbon fiber is 25:1, and the volume percentage of the control steel wire and the carbon fiber is 10% of the material.

Get steel wire and prepare clean spherical steel wire group by the conventional method of cleaning ball production, the diameter of steel wire group is 10cm, and the steel wire surface is not nickel-plated.

The preparation process is the same as in Example 1.

Comparative example five

The weight percentage of the chemical composition of the magnesium alloy matrix: Al is 13%, Sr is 0.6%, Si is 4%, Zr is 0.9%, Fe is 3%, Gd is 2%, Ho is 0.04%, and the rest is Mg .

The weight percentage of the chemical composition of the steel wire is: C is 0.7%, Si is 0.4%, Mn is 0.4%, P<0.02%, S<0.025%; the cross section of the steel wire is rectangular, and the specification is 0.5mm×2mm.

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 600:1.

The weight ratio of the steel wire and the carbon fiber is 25:1, and the volume percentage of the control steel wire and the carbon fiber is 60% of the material.

Get steel wire and prepare clean spherical steel wire group by the conventional method of cleaning ball production, the diameter of steel wire group is 10cm, and obtain nickel-plated steel wire group at its surface nickel-plated according to conventional method, the thickness of described nickel-plated layer is 200 μ m.

The preparation process is the same as in Example 1.

Product performance analysis:

It can be seen from the table below that the increase of Al, Sr, Si, Zr, Fe, Gd, and Ho in magnesium alloy materials is conducive to the improvement of the mechanical properties of the alloy; but some elements such as Al, Sr, Si, and Fe are too much to form a dispersed Too much compound will weaken the wear resistance of the alloy. Some elements such as Gd and Ho are too much, resulting in waste of elements.

The increase of C, Si and Mn in the steel wire composition is beneficial to the improvement of the mechanical properties of the alloy; too much will weaken the wear resistance of the alloy.

The cross-section of the steel wire is rectangular to facilitate the bonding of carbon fibers. If the section size is too small, it is not conducive to bonding carbon fibers; on the contrary, if the size is too large, the tendency to split the matrix increases.

Too small or too large carbon fiber aspect ratio is not conducive to bonding with rectangular cross-section steel wire.

The increase in the volume percentage of steel wire and carbon fiber is conducive to the improvement of material toughness. But too much will reduce the hardness of the material, thus reducing the wear resistance of the material, such as product 5, and the magnesium alloy water is not easy to surround the steel wire and carbon fiber; on the contrary, if the volume percentage of steel wire and carbon fiber in the material is too small, it is not conducive to The role of steel wire and carbon fiber.

The thickness of the nickel plating layer increases, which is beneficial to the alloying of magnesium alloy water; but if the thickness is too large, nickel is not easy to melt into the magnesium alloy water in a short time, resulting in waste of elements, and at the same time the cost of heat treatment increases; on the contrary, the nickel plating layer on the surface of the steel wire If the thickness is too small, the hardness of the steel wire will decrease, and it is not conducive to the formation of dispersed compounds. the

The performance comparison of each product obtained in table 1

Claims (1)

1. A preparation method for damping wear-resistant magnesium alloy material, characterized in that: it may further comprise the steps: Preparation of nickel-plated steel wire and carbon fiber: the cross-section is rectangular, and the specification is 0.1-0.4mm×0.5-1.5mm, and the composition is 0.45%-0.65% for C, 0.2%-0.3% for Si, and 0.25%- 0.35%, P<0.02%, S<0.025%, the rest is Fe steel wire, and T300 carbon fiber with a diameter of 7 microns and an aspect ratio of 100-500:1; the weight ratio of the steel wire to carbon fiber is 25-30 : 1, the volume percentage of both steel wire and carbon fiber accounts for 20-40% of the material; get the steel wire and prepare a clean spherical steel wire group according to the conventional method of cleaning ball production. Nickel-plating on its surface to obtain a nickel-plated steel wire ball, the thickness of the nickel-plated layer is 50-100 μm; Preparation of nickel-plated steel wire balls adhered to carbon fibers: immerse nickel-plated steel wire balls in water glass solution, the concentration of water glass solution is 1.3-1.5 g/cm ³ , and the modulus is 2.6-3.0; take out the steel wire balls from the water glass solution , and then sprinkle the carbon fibers onto the steel wire balls with water glass solution, so that the carbon fibers evenly stick to the surface of the steel wires; after the water glass solidifies, put some steel wire balls with carbon fibers into the mold cavity; The degree of tightness is determined by the volume percentage of steel wire and carbon fiber in the material, and it is ensured that the steel wire cluster is just filled with the mold; then the upper mold of the mold is covered on the lower mold, and the magnesium alloy water is poured after the box is closed; Preparation of magnesium alloy matrix: Al is 10% to 12% by weight, Sr is 0.2% to 0.5%, Si is 2% to 3%, Zr is 0.2% to 0.8%, and Fe is 1% to 2%. , Gd is 0.5%-1%, Ho is 0.01%-0.03%, and the rest is Mg for batching; the magnesium alloy substrate is melted in an induction furnace to obtain magnesium alloy water, and the melting temperature is 700-720°C; The above-mentioned magnesium alloy water is poured into the casting mold equipped with steel wire clusters adhering to carbon fibers, and the liquid magnesium alloy water enters the gap between the steel wire clusters to surround the carbon fibers and steel wires, and then cools and solidifies to form a magnesium alloy matrix in which carbon fibers and steel wires are distributed. The material of the wire ball.

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