CN103880479A - Cu-coated Ti3AlC2 powder material and preparation method thereof - Google Patents

Abstract

The invention relates to a Cu-coated Ti3AlC2 powder material and a preparation method thereof. Each grain of Ti3AlC2 powder is completely or partially coated with Cu. The preparation method is characterized in that Ti3AlC2 powder is coated with metal Cu powder; Cu powder and Ti3AlC2 powder are mixed and blended in a volume ratio of (1:1)-(1:4); the mixed material is put in a vacuum ball mill tank, and stainless steel balsl are added into the vacuum ball mill tank; the ball mill tank is vacuumized; high-energy ball milling is performed on a high-energy planetary ball mill, wherein the grinding media-material ratio is (10:1)-(50:1), the rotating speed of the ball mill is 200-400rpm, and the ball milling time is 1-10 hours. Mechanical alloying ball milling results indicate that Cu powder can be embedded in the surfaces of the Ti3AlC2 powder grains under the process condition, so as to form a core-shell structure in which the Ti3AlC2 powder grains are coated with the Cu powder.

Description

The coated Ti of a kind of Cu 3alC 2powdered material and preparation method thereof

Technical field

The technical field that the present invention relates to metal parcel ceramic powder, particularly one realizes at Ti with Mechanical Alloying ₃alC ₂the technological method of powder surface parcel one deck Cu metal.

Background technology

Ternary layered ceramic titanium aluminium carbon (Ti ₃alC ₂) have the premium properties of stupalith and metal concurrently.The same with metal, at normal temperatures, there is good conductivity and heat conductivility, there are lower Vickers' hardness, higher Young's modulus and shearing modulus, good machining property, and at high temperature there is plasticity; Meanwhile, there is again the performance of stupalith, have high yield strength, high-melting-point, high-modulus, acid-alkali-corrosive-resisting and good antioxidant property, good self lubricity.Therefore, Ti ₃alC ₂pottery can be used as a kind of enhancing phase strengthened metal base composite material of novel excellent property, but Ti ₃alC ₂to exist the bad interface of wettability to be combined poor with the direct compound tense of some metal, and easily vigorous reaction generates harmful phase, and thermal expansivity such as does not mate at the problem.Limit to a large extent Ti ₃alC ₂strengthen the application of metal-base composites in Practical Project.For breaking through Ti ₃alC ₂strengthen this bottleneck of metal-base composites development, find pottery and the better interface of a metal combining method effective approach beyond doubt.

The ideal interface bonding state of ceramic-metal composite is that Presence of an interface soaks or chemical reaction to a certain degree occurs at interface, has chemical bonds.But Ti ₃alC ₂during directly with some metal composite, the bad or vigorous reaction of wettability generates and is harmful to phase.Address these problems, on ceramic phase surface, coated one deck and metallic matrix wettability well and not react that to generate objectionable impurities be a kind of good method.

For addressing these problems, the present invention adopts the method for mechanical alloying at Ti ₃alC ₂powder surface is coated one deck Cu, has prepared the coated Ti of Cu ₃alC ₂powder, prevents Ti when improving wettability ₃alC ₂with matrix direct reaction.The present invention by research ball-milling technology, draws under compared with less energy-consumption condition, reaches good covered effect.

Summary of the invention

The present invention adopts the method for mechanical alloying at Ti ₃alC ₂powder surface is coated layer of copper, has prepared the coated Ti of Cu ₃alC ₂powder.Key technical problem to be solved by this invention is by Mechanical Alloying, has studied the impact of ball-milling technology on covered effect, realizes Cu powder at Ti ₃alC ₂the complete coated or part of powder surface is coated.Observe covered effect by scanning electron microscope and energy spectrum analysis.Draw the cladding process parameter of good covered effect.

For realizing the coated Ti of Cu powder ₃alC ₂powder, the present invention has adopted Mechanic Alloying Technology means.The method comprises the steps:

1) select the stainless-steel vacuum ball grinder of 250ml volume, when mechanical alloying, the stacking factor of ball grinder gets 0.5～0.6.Abrading-ball is Stainless Steel Ball, and diameter has Ф 10mm, tri-kinds of Ф 7.5mm and Ф 6mm.Press stacking factor, according to standard configuration, choose the abrading-ball that quality is 600g.

2) according to step 1) in the total amount 600g of abrading-ball, (10:1)～ball material mass ratio (50:1) adds Cu powder and Ti ₃alC ₂powder.The volume fraction of Cu powder is 20～50%, and all the other are Ti ₃alC ₂powder.The impact of the volume content of research Cu powder on covered effect.

3) by step 1) and step 2) abrading-ball and the powder that prepare add in vacuum sphere grinding jar simultaneously, twists after good and vacuumize 15min with rotary-vane vaccum pump, prevents that in mechanical milling process, powder is oxidized.

4) by step 3) vacuum sphere grinding jar be positioned on planetary ball mill, speed setting is at 200rpm, 300rpm and 400rpm.Ball-milling Time is 1～10h, carries out mechanical alloying parcel Ti ₃alC ₂powder.Every 1h sampling analysis covered effect, for preventing in ball grinder excess Temperature and improving grinding efficiency, every ball milling 2h is intermittently after air-cooled 30min, then continues ball milling.

5) by step 4) take out coated after powder do scanning electron microscope analysis, observe coated after the pattern of powder, and with EDS energy spectrum analysis Ti ₃alC ₂powder check covered effect.Find that by scanning electron microscopic observation and EDS energy spectrum analysis Cu powder is evenly coated on Ti ₃alC ₂powder surface or except Ti ₃alC ₂c direction of principal axis outside, other parts are completely coated, form core shell-like structure.Obtain the coated Ti of mechanical alloying Cu powder of the present invention ₃alC ₂powder.Cu powder is coated Ti ₃alC ₂granule-morphology after powder is shown in accompanying drawing 1.

accompanying drawing explanation

Fig. 1 is the coated Ti of Cu ₃alC ₂powder mix before granule-morphology figure (a) is coated; (b) coated figure after ball milling 2h; (c) coated figure after ball milling 4h; (d) coated figure after ball milling 6h; (e) coated figure after ball milling 8h; (f) coated figure after ball milling 10h.

Embodiment

Embodiment 1

Ti ₃alC ₂: Ti used in the present embodiment ₃alC ₂the granularity D of powder ₅₀be about 6 μ m, its purity is greater than 99.5%.

Cu powder: the granularity D of Cu powder used in the present embodiment ₅₀be about 34 μ m, its purity is greater than 99.5%.

Press Cu:Ti ₃alC ₂the volume ratio batching of=1:4, takes Cu powder 10.34g, Ti ₃alC ₂powder 19.66g puts into ball grinder, and ratio of grinding media to material is 20:1, adds the Stainless Steel Ball of 600g.Ball grinder is vacuumized to sealing, ball milling 4h on the planetary ball mill that is 400rpm at rotating speed.After ball milling 4h, EDS power spectrum is at Ti ₃alC ₂powder surface detects copper, in conjunction with SEM scanning electron microscope analysis, can draw Ti ₃alC ₂powder is coated by Cu powder.

Embodiment 2

Ti ₃alC ₂: Ti used in the present embodiment ₃alC ₂the granularity D of powder ₅₀be about 6 μ m, its purity is greater than 99.5%.

Cu powder: the granularity D of Cu powder used in the present embodiment ₅₀be about 34 μ m, its purity is greater than 99.5%.

Press Cu:Ti ₃alC ₂the volume ratio batching of=3:7, takes Cu powder 14.23g, 15.77gTi ₃alC ₂put into ball grinder, ratio of grinding media to material is 20:1, adds the Stainless Steel Ball of 600g.Ball grinder is vacuumized to sealing, ball milling 2h on the planetary ball mill that is 400rpm at rotating speed.Can find out by SEM scanning electron microscope and EDS power spectrum, after ball milling 2h, Ti ₃alC ₂powder is coated by Cu powder.

Embodiment 3

Ti ₃alC ₂: Ti used in the present embodiment ₃alC ₂the granularity D of powder ₅₀be about 6 μ m, its purity is greater than 99.5%.

Cu powder: the granularity D of Cu powder used in the present embodiment ₅₀be about 34 μ m, its purity is greater than 99.5%.

Press Cu:Ti ₃alC ₂the volume ratio batching of=1:1, takes Cu powder 20.34g, 9.66gTi ₃alC ₂put into ball grinder, ratio of grinding media to material is 20:1, adds the Stainless Steel Ball of 600g.Ball grinder is vacuumized to sealing, ball milling 2h, 4h, 6h and 8h on the planetary ball mill that is 400rpm at rotating speed.Do SEM scanning electron microscope and EDS energy spectrum analysis discovery every 2h sampling, after ball milling 2h, can obtain wrapping up good Ti ₃alC ₂particle.Along with the carrying out of Ball-milling Time, wrapped Ti ₃alC ₂powder diameter diminishes gradually, and covered effect is still good.

Embodiment 4

Ti ₃alC ₂: Ti used in the present embodiment ₃alC ₂the granularity D of powder ₅₀be about 23 μ m, its purity is greater than 99.5%.

Cu powder: the granularity D of Cu powder used in the present embodiment ₅₀be about 34 μ m, its purity is greater than 99.5%.

Press Cu:Ti ₃alC ₂the volume ratio batching of=1:1, takes Cu powder 20.34g, 9.66gTi ₃alC ₂put into ball grinder, ratio of grinding media to material is 20:1, adds the Stainless Steel Ball of 600g.Ball grinder is vacuumized to sealing, ball milling 1h, 2h, 4h, 6h, 8h and 10h on the planetary ball mill that is 400rpm at rotating speed.Do SEM scanning electron microscope and EDS energy spectrum analysis discovery every 2h sampling: after ball milling 1h, can obtain coated good Ti ₃alC ₂powder.Along with the carrying out of Ball-milling Time, wrapped Ti ₃alC ₂powder diameter diminishes gradually, and covered effect is still good.

Embodiment 5

Ti ₃alC ₂: Ti used in the present embodiment ₃alC ₂the granularity D of powder ₅₀be about 6 μ m, its purity is greater than 99.5%.

Cu powder: the granularity D of Cu powder used in the present embodiment ₅₀be about 34 μ m, its purity is greater than 99.5%.

Press Cu:Ti ₃alC ₂the volume ratio batching of=1:1, takes Cu powder 13.55g, 6.45gTi ₃alC ₂put into ball grinder, ratio of grinding media to material is 30:1, adds the Stainless Steel Ball of 600g.Ball grinder is vacuumized to sealing, ball milling 4h on the planetary ball mill that is 400rpm at rotating speed.Coated Ti of Cu powder after ball milling 4h ₃alC ₂powder, Ti after parcel ₃alC ₂powder is more even, and covered effect is good.

Claims (2)

1. the coated Ti of Cu ₃alC ₂powdered material, is characterized in that, Ti ₃alC ₂each particle of powder is by the complete parcel of Cu or part parcel; Wherein Ti ₃alC ₂the granularity of powder is 2 μ m～99 μ m, and the thickness of Cu integument is 0～2 μ m.

2. the coated Ti of Cu ₃alC ₂the preparation method of powdered material, is characterized in that, the method comprises the steps:

1) by Cu powder, Ti ₃alC ₂powder mixes by (1:1)～(1:4) volume ratio, adds the Stainless Steel Ball of goal material mass ratio (10:1)～(50:1);

2) mixture is packed in the sealed can of ball mill, vacuumize;

3) carry out the ball milling of 1～10 hour, obtain the coated Ti of a kind of Cu described in claim 1 ₃alC ₂powdered material.

Images