CN113880586B - Hafnium diboride-tantalum disilicide composite powder and preparation method thereof - Google Patents

Hafnium diboride-tantalum disilicide composite powder and preparation method thereof Download PDF

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CN113880586B
CN113880586B CN202111315077.4A CN202111315077A CN113880586B CN 113880586 B CN113880586 B CN 113880586B CN 202111315077 A CN202111315077 A CN 202111315077A CN 113880586 B CN113880586 B CN 113880586B
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tantalum disilicide
hafnium diboride
composite powder
tantalum
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CN113880586A (en
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柳彦博
谢明劭
刘少璞
王一帆
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Beijing Institute of Technology BIT
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Abstract

The invention provides hafnium diboride-tantalum disilicide composite powder and a preparation method thereof, belonging to the technical field of composite powder materials. The diboron provided by the inventionThe hafnium-tantalum disilicide composite powder is a molten eutectic state, and comprises the following components of hafnium diboride and tantalum disilicide in a mass ratio of 2-11. The invention uses tantalum disilicide as a modifying component of hafnium diboride, on the one hand, the high temperature oxidation product SiO of tantalum disilicide 2 Can be used as a good high-temperature sealing phase to seal and fill the hole defects of the hafnium diboride coating; on the other hand, ta, another high-temperature oxidation product of tantalum disilicide 2 O 5 Can be reacted with HfO 2 Solid solution reaction occurs to form HfTaO x To a certain extent suppress HfO 2 The crystal form of the powder is changed, and the high-temperature thermal stability of the powder is improved. Therefore, the hafnium diboride-tantalum disilicide composite powder provided by the invention has good high-temperature oxidation and ablation resistance.

Description

Hafnium diboride-tantalum disilicide composite powder and preparation method thereof
Technical Field
The invention relates to the technical field of composite powder materials, in particular to hafnium diboride-tantalum disilicide composite powder and a preparation method thereof.
Background
Carbon fiber reinforced carbon matrix composites (C/C) are characterized by low density, low coefficient of thermal expansion at high temperatures, and excellent mechanical properties, and are considered to be one of the most promising materials for aircraft hot-end components. However, in an aerobic environment of 400 ℃ or higher, the carbon fiber reinforced carbon matrix composite is easily oxidized, resulting in a decrease in performance. Preparing an anti-oxidative ablative coating on the surface thereof is one of the effective methods.
Hafnium diboride (HfB) 2 ) Is a hexagonal metalloid structure compound, has high melting point (3380 ℃) and high hardness, excellent chemical stability and the likeThe carbon fiber-reinforced carbon matrix composite material has the advantages of being expected to be used as an oxidation and ablation resistant coating material of the carbon fiber-reinforced carbon matrix composite material. At present, single hafnium diboride as an antioxidant material can generate a glass phase B under the high temperature condition of more than 1100 DEG C 2 O 3 Large amount of volatilization and HfO 2 The oxide porous skeleton is exposed, so that the oxidation resistance is greatly reduced.
Disclosure of Invention
In view of the above, the present invention is directed to a hafnium diboride-tantalum disilicide composite powder and a preparation method thereof. The hafnium diboride-tantalum disilicide composite powder provided by the invention has good high-temperature oxidation resistance.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides hafnium diboride-tantalum disilicide composite powder, which is a molten eutectic state, and comprises the following components in a mass ratio of 2-11.
Preferably, the particle size of the hafnium diboride-tantalum disilicide composite powder is 10-80 μm.
Preferably, the fluidity of the hafnium diboride-tantalum disilicide composite powder is 9.88 to 11.25s/50g, and the apparent density is 6.19 to 6.38g/cm 3 。
The invention provides a preparation method of the hafnium diboride-tantalum disilicide composite powder, which comprises the following steps:
(1) Mixing hafnium diboride powder, tantalum disilicide powder, a binder and a polar dispersion solvent to obtain a precursor powder dispersion liquid, wherein the mass ratio of the hafnium diboride powder to the tantalum disilicide powder is (2-11);
(2) And sequentially carrying out granulation, spheroidization and ultrasonic treatment on the precursor powder dispersion liquid to obtain the hafnium diboride-tantalum disilicide composite powder.
Preferably, the particle size of the hafnium diboride powder is 1-3 μm; the grain diameter of the tantalum disilicide powder is 1-3 microns.
Preferably, the binder is polyvinyl alcohol, the alcoholysis degree of the polyvinyl alcohol is more than or equal to 88%, and the viscosity of the polyvinyl alcohol is 8-10 mPa & s.
Preferably, the mass percentage of the hafnium diboride powder and the tantalum disilicide powder in the precursor powder dispersion liquid in the step (1) is 35-60%, and the mass percentage of the binder is 0.4-0.6%.
Preferably, the granulation is spray-drying granulation, and the parameters of the spray-drying granulation include:
the inlet temperature is 230-260 ℃;
the outlet temperature is 120-140 ℃;
the rotating speed of the spray head is 30-40 Hz;
the speed of the peristaltic pump used for spray drying is 30-35 rpm.
Preferably, the spheroidizing process is an induction plasma spheroidizing process, and the parameters of the induction plasma spheroidizing process include:
the power was 40kW, the argon flow rate was 60SCFH, the hydrogen flow rate was 6SCFH, and the powder feed rate was 5.0RPM.
The invention provides application of the hafnium diboride-tantalum disilicide composite powder as an anti-oxidation ablation coating material.
The invention provides hafnium diboride-tantalum disilicide composite powder, which is a molten eutectic state, and comprises the following components in a mass ratio of 2-11. The invention uses tantalum disilicide as a modified component of hafnium diboride, and in a high-temperature environment, on the one hand, the high-temperature oxidation product SiO of the tantalum disilicide 2 Can be used as a good high-temperature sealing phase to seal and fill the hole defects of the hafnium diboride coating; on the other hand, ta, another high-temperature oxidation product of tantalum disilicide 2 O 5 Can react with HfO 2 Solid solution reaction occurs to form HfTaO x To a certain extent suppress HfO 2 The crystal form of the powder is changed, and the high-temperature thermal stability of the powder is improved. Therefore, the hafnium diboride-tantalum disilicide composite powder provided by the invention has good high-temperature oxidation ablation resistance, and the prepared hafnium diboride-tantalum disilicide composite coating can protect a substrate from being oxidized at 1800 ℃. The results of the examples show that hafnium diboride-tantalum disilicide composite coatings are oxidized with oxygenAfter acetylene ablation examination, the mass loss rate of the coating is 3.57 multiplied by 10 -4 g/s, 10 lower than that of conventional ultrahigh temperature ceramic coating -3 Of this order.
Meanwhile, the hafnium diboride-tantalum disilicide composite powder provided by the invention has good powder flowability and apparent density, and is beneficial to preparation of coatings.
The invention provides a preparation method of the hafnium diboride-tantalum disilicide composite powder, and the preparation method adopts a method of mixing the hafnium diboride powder, the tantalum disilicide powder, the binder and the polar dispersing solvent, and sequentially carrying out granulation and spheroidization treatment, so that the preparation method is simple to operate, easy to realize industrial batch production and has good application prospect.
Drawings
FIG. 1 is a scanning electron microscope image of the surface of the hafnium diboride-tantalum disilicide composite powder obtained in example 1;
FIG. 2 is a cross-sectional scanning electron microscope image of the hafnium diboride-tantalum disilicide composite powder obtained in example 1;
FIG. 3 is an X-ray diffraction pattern of the hafnium diboride-tantalum disilicide composite powder obtained in example 1;
FIG. 4 is an elemental analysis chart of the hafnium diboride-tantalum disilicide composite powder prepared in example 1;
FIG. 5 is a scanning electron microscope image of a cross-section of a coating formed by hot pressing the hafnium diboride-tantalum disilicide composite powder of example 1.
Detailed Description
The invention provides a hafnium diboride-tantalum disilicide composite powder, which is a molten eutectic state, and comprises the following components in percentage by mass, wherein the mass ratio of the hafnium diboride to the tantalum disilicide is (2-11): 1. in the present invention, the volume ratio of the hafnium diboride to the tantalum disilicide is 2.3 to 9, preferably 4.
In the present invention, the particle size of the hafnium diboride-tantalum disilicide composite powder is preferably 10 to 80 μm, more preferably 20 to 60 μm, and still more preferably 30 to 50 μm.
In the invention, the fluidity of the hafnium diboride-tantalum disilicide composite powder is preferably 9.88 to 11.25s/50g, and more preferably 10.67s/50g; the loose packed density is preferably 6.19 to 6.38g/cm 3 More preferably 6.23g/cm 3 。
The invention uses tantalum disilicide as a modifying component of hafnium diboride, on the one hand, the oxidation product SiO of tantalum disilicide 2 Can be used as a good high-temperature sealing phase to seal and fill the hole defects of the hafnium diboride coating; on the other hand, ta, another oxidation product of tantalum disilicide 2 O 5 Can be reacted with HfO 2 Solid solution reaction occurs to form HfTaO x To a certain extent suppress HfO 2 The crystal form of the powder is changed, and the high-temperature thermal stability of the powder is improved.
The invention provides a preparation method of the hafnium diboride-tantalum disilicide composite powder, which comprises the following steps:
(1) Mixing hafnium diboride powder, tantalum disilicide powder, a binder and a polar dispersion solvent to obtain a precursor powder dispersion liquid, wherein the mass ratio of the hafnium diboride powder to the tantalum disilicide powder is (2-11);
(2) And sequentially carrying out granulation, spheroidization and ultrasonic treatment on the precursor powder dispersion liquid to obtain the hafnium diboride-tantalum disilicide composite powder.
The method comprises the steps of mixing hafnium diboride powder, tantalum disilicide powder, a binder and a polar dispersion solvent to obtain a precursor powder dispersion liquid, wherein the mass ratio of the hafnium diboride powder to the tantalum disilicide powder is (2-11). In the invention, the particle size of the hafnium diboride powder is preferably 1 to 3 μm, and more preferably 2 μm; the purity of the hafnium diboride powder is preferably more than or equal to 99.9 percent.
In the present invention, the particle size of the tantalum disilicide powder is preferably 1 to 3 μm, and more preferably 2 μm; the purity of the tantalum disilicide powder is preferably more than or equal to 99.9%.
In the invention, the binder is preferably polyvinyl alcohol, and the alcoholysis degree of the polyvinyl alcohol is preferably greater than or equal to 88%, and more preferably 88-95%; the viscosity is preferably 8 to 10 mPas, more preferably 9 mPas. In the present invention, the binder is used for binding the raw material particles.
In the present invention, the polar dispersion solvent is preferably water or absolute ethanol.
In the invention, the mass percentage content of the hafnium diboride powder and the tantalum disilicide powder in the precursor powder dispersion liquid is preferably 35-60%, and more preferably 40-50%; the content of the binder is preferably 0.4 to 0.6% by mass, and more preferably 0.5% by mass.
The invention has no special requirements on the sources of the hafnium diboride powder, the tantalum disilicide powder, the binder and the polar dispersing solvent, and the products which are generally sold on the market in the field can be used.
In the present invention, the mixing is preferably performed by ball milling. In the present invention, the rotation speed of the ball milling mixing is preferably 200 to 250rpm, more preferably 220 to 240rpm; the time is preferably not less than 3 hours, more preferably 4 to 5 hours. In the present invention, the ball-milling mixing preferably has a ball-to-material ratio of 3 to 5, more preferably 4.
After the dispersion liquid is obtained, the precursor powder dispersion liquid is sequentially subjected to granulation, spheroidization and ultrasonic treatment to obtain the hafnium diboride-tantalum disilicide composite powder. In the present invention, the granulation is preferably spray-drying granulation. The granulation is preferably carried out in a spray drying granulation tower according to the present invention. In the present invention, the parameters of the spray drying granulation preferably include:
the inlet temperature is preferably 230 to 260 ℃, and more preferably 250 ℃;
the outlet temperature is preferably 120 to 140 ℃, more preferably 130 ℃;
the rotating speed of the spray head is preferably 30-40 Hz, and more preferably 35Hz;
the speed of the peristaltic pump used for spray drying is preferably 30 to 35rpm, more preferably 32rpm.
And after the granulation, obtaining the hafnium diboride-tantalum disilicide agglomerated powder, wherein the grain diameter of the hafnium diboride-tantalum disilicide agglomerated powder is preferably less than or equal to 105 microns, and more preferably 20-80 microns.
The invention preferably dries the hafnium diboride-tantalum disilicide agglomerated powder obtained after granulation. The invention has no special requirements on the specific operation mode of the drying, and the drying mode known by the technical personnel in the field can be used.
In the present invention, the spheroidizing is preferably an induction plasma spheroidizing. The present invention preferably performs the induction plasma spheroidizing process in an induction plasma spheroidizing apparatus. In the present invention, the parameters of the induction plasma spheroidizing process preferably include: the power was 40kW, the argon flow rate was 60SCFH, the hydrogen flow rate was 6SCFH, and the powder feed rate was 5.0RPM.
In the invention, the powder obtained after spheroidizing treatment is preferably dispersed in water for ultrasonic treatment. In the invention, the power of the ultrasonic wave is preferably 300-500W, and the time is preferably 20min.
After the ultrasonic treatment, the solid-liquid separation is preferably carried out on the dispersion liquid after the ultrasonic treatment, and the obtained powder is dried and sieved in sequence to obtain the hafnium diboride-tantalum disilicide composite powder, wherein the particle size of the hafnium diboride-tantalum disilicide composite powder is preferably 10-80 microns, more preferably 20-60 microns, and further preferably 30-50 microns.
After sieving, the obtained hafnium diboride-tantalum disilicide composite powder is preferably dried at the temperature of 80-200 ℃, more preferably 100-150 ℃; the time is preferably 20 to 30 hours, more preferably 25 hours.
The invention provides application of the hafnium diboride-tantalum disilicide composite powder as an anti-oxidation ablation coating material.
The hafnium diboride-tantalum disilicide composite powder and the preparation method thereof according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
In the following examples:
PVA: the purity is more than or equal to 97 percent and is produced by Beijing Yili fine chemicals Co.
Hafnium diboride and tantalum disilicide raw materials: the particle size is 1-3 μm, the purity is 99.9%, and the product is purchased from Mitsui New materials science and technology Co., ltd.
Spray drying prilling tower: LGZ-8 centrifugal spray dryer of Wuxi Dongjiang spray granulation drying machinery factory.
Induction plasma spheroidization equipment: induction plasma spheroidizing equipment manufactured by teknaplasma systems inc.
And (4) SEM characterization: the morphology of the hafnium diboride-tantalum disilicide composite powder prepared in the examples and the morphology of the prepared coating are observed by using a cold field emission scanning electron microscope of Japan high and new technology Co., ltd, model S-4800.
XRD analysis: the composite powder prepared in the embodiment is analyzed by an X' PertPRODPD type polycrystalline X-ray diffraction analyzer produced by PANALYtical corporation in the Netherlands; and (3) testing conditions: k of Cu α Ray, ni filter, tube voltage 40kV, tube current 40mA, slit size DS =0.957 °, PSD =2.12, scan speed 4 °/min.
And (3) testing the fluidity: the prepared composite powder was tested for flowability by using a FL4-1 Hall flow meter manufactured by Beijing institute of iron and Steel.
Testing loose packed density: the test was carried out according to the measurement of the apparent density of GBT 1479.1-2011 metal powder.
Oxygen-acetylene flame assessment: the procedure was followed in accordance with GJB 323-1987 oxy-acetylene ablation test method.
Example 1
(1) Adding 739.9g of hafnium diboride, 260.1g of tantalum disilicide, 5g of PVA and 1500g of deionized water into a ball milling tank, wherein the ball-material ratio is 4;
(2) Transferring the suspension obtained in the step (1) to a spray drying granulation tower for agglomeration granulation, putting the granulated powder into an oven at 80 ℃ for drying for 30h, and then performing inspection screening to obtain HfB with the particle size of less than 105 mu m 2 -TaSi 2 Agglomerated powder (HfB) 2 With TaSi 2 The volume ratio is 7;
wherein, the spray drying granulation parameters are as follows: the inlet temperature is 250 ℃, the outlet temperature is 130 ℃, the rotating speed of the spray head is 35Hz, and the rotating speed of the peristaltic pump is 30rpm;
(3) HfB is formed 2 -TaSi 2 Sending the agglomerated powder into an induction plasma spheroidizing device for spheroidizing, collecting the spheroidized powder, pouring the collected powder into deionized waterPerforming ultrasonic treatment for 20min, finally pouring out the suspension liquid, only reserving bottom sediments, placing the suspension liquid in a drying oven at the temperature of 100 ℃ for drying for 30h, and then performing inspection screening to obtain the hafnium diboride-tantalum disilicide composite powder;
the induction plasma spheroidization parameters are as follows: the power was 40kW, the argon flow rate was 60SCFH, the hydrogen flow rate was 6SCFH, and the powder feed rate was 5.0RPM.
The surface Scanning Electron Microscope (SEM) of the obtained hafnium diboride-tantalum disilicide composite powder is shown in figure 1. As can be seen from FIG. 1, the obtained hafnium diboride-tantalum disilicide composite powder has a spherical shape with a compact and smooth surface and a particle size of 40 μm.
The cross-sectional Scanning Electron Microscope (SEM) of the obtained hafnium diboride-tantalum disilicide composite powder is shown in FIG. 2. As can be seen from FIG. 2, the cross section of the prepared composite powder has no obvious defect holes, and the modified additive tantalum disilicide and the hafnium diboride are well combined.
The X-ray diffraction spectrum of the obtained hafnium diboride-tantalum disilicide composite powder is shown in figure 3. As can be seen from FIG. 3, characteristic peaks of hafnium diboride and tantalum disilicide appear in the spectrum; it is understood from this that tantalum disilicide was successfully added to the composite powder, and the composition was not changed during the preparation.
The element distribution of the obtained hafnium diboride-tantalum disilicide composite powder cross section is detected, and the obtained result is shown in figure 4. As can be seen from FIG. 4, the composite powder has no obvious segregation phenomenon of elements and the whole elements are uniformly distributed.
Example 2
(1) Adding 830.2g of hafnium diboride, 169.8g of tantalum disilicide, 5g of PVA and 1500g of deionized water into a ball milling tank, wherein the ball-to-material ratio is 4;
(2) Transferring the suspension obtained in the step (1) to a spray drying granulation tower for agglomeration granulation, drying the granulated powder in a drying oven at 150 ℃ for 20 hours, and screening by a test sieve to obtain HfB with the particle size of less than 105 mu m 2 -TaSi 2 Agglomerated powder (HfB) 2 With TaSi 2 The volume ratio is 8;
wherein, the parameters of spray drying granulation are as follows: the inlet temperature is 250 ℃, the outlet temperature is 130 ℃, the rotating speed of the spray head is 35Hz, and the rotating speed of the peristaltic pump is 35rpm;
(3) To HfB 2 -TaSi 2 Conveying the agglomerated powder into an induction plasma spheroidizing device for spheroidizing, collecting spheroidized powder, pouring the collected powder into deionized water, performing ultrasonic treatment for 20min, finally pouring suspension to only leave bottom sediments, drying in a drying oven at 100 ℃ for 30h, and then performing inspection screening to obtain the hafnium diboride-tantalum disilicide composite powder;
the induction plasma spheroidization parameters are as follows: the power is 40kW, the argon flow is 60SCFH, the hydrogen flow is 6SCFH, and the powder feeding rate is 5.0RPM.
Performing SEM representation on the prepared composite powder, wherein the prepared composite powder is in a spherical shape with a compact and smooth surface and has a particle size distribution of 20-80 microns according to a representation result; according to the cross section SEM characterization result, the prepared composite powder has no obvious defect holes, and the modified additive is well combined with the bulk substance. The XRD spectrogram of the prepared composite powder has characteristic peaks of hafnium diboride and tantalum disilicide, so that the tantalum disilicide is successfully added into the composite powder, and the preparation process has no component transformation.
Example 3
(1) Adding 916.7g of hafnium diboride, 83.3g of tantalum disilicide, 5g of PVA and 1500g of deionized water into a ball milling tank, wherein the ball-to-material ratio is 4;
(2) Transferring the suspension obtained in the step (1) to a spray drying granulation tower for agglomeration granulation, putting the granulated powder into a 120 ℃ oven for drying for 25h, and then performing inspection screening to obtain HfB with the particle size of less than 105 mu m 2 -TaSi 2 Agglomerated powder (HfB) 2 With TaSi 2 The volume ratio is 9);
wherein, the spray drying granulation parameters are as follows: the inlet temperature is 250 ℃, the outlet temperature is 130 ℃, the rotating speed of the spray head is 40Hz, and the rotating speed of the peristaltic pump is 35rpm;
(3) To HfB 2 -TaSi 2 Sending the agglomerated powder into an induction plasma spheroidizing device for spheroidizingTreating, namely collecting spheroidized powder by using deionized water, pouring the collected powder into the deionized water, performing ultrasonic treatment for 20min, finally pouring out suspension liquid, only reserving bottom sediments, drying the suspension liquid in a drying oven at 100 ℃ for 30h, and then performing inspection screening to obtain hafnium diboride-tantalum disilicide composite powder;
wherein, the induction plasma spheroidization parameters are as follows: the power is 40kW, the argon flow is 60SCFH, the hydrogen flow is 6SCFH, and the powder feeding rate is 5.0RPM.
Performing SEM representation on the prepared composite powder, wherein the prepared composite powder is in a spherical shape with a compact and smooth surface and has a particle size distribution of 20-80 microns according to a representation result; according to the cross section SEM characterization result, the prepared composite powder has no obvious defect holes, and the modified additive is well combined with the bulk substance. The XRD spectrogram of the prepared composite powder has characteristic peaks of hafnium diboride and tantalum disilicide, so that the tantalum disilicide is successfully added into the composite powder, and no component transformation exists in the preparation process.
Comparative example 1
Comparative example 1 differs from example 1 in HfB 2 With TaSi 2 The volume ratio is 1.
Comparative example 2
The difference between the comparative example 2 and the example 1 is that the pure hafnium diboride powder is obtained by omitting the addition of tantalum disilicide and the rest of the operation is the same.
Performance test
Fluidity and apparent Density of (I) powder
HfB before spheroidization in examples 1 to 3 2 -TaSi 2 The agglomerated powder and the fluidity and apparent density of the obtained hafnium diboride-tantalum disilicide composite powder after spheroidization were tested, and the obtained results are shown in table 1.
TABLE 1 flowability and packing Density of powder before and after spheroidization in examples 1 to 3
Figure BDA0003343377260000091
As can be seen from Table 1, the fluidity and the apparent density of the spheroidized powder are greatly improved, and the preparation of the hafnium diboride-tantalum disilicide composite coating by using a spraying method is facilitated.
Oxyacetylene ablation examination of (II) coatings
The powders obtained in the examples 1-3 and the comparative examples 1-2 are prepared into coatings by adopting a hot pressing process, the hot pressing process is carried out in a graphite resistance furnace with the vacuum level of 100Pa, argon is filled in the furnace, and the hot pressing conditions are as follows: heating to 1900 deg.C at a heating rate of 30 deg.C/min, maintaining for 20min, and cooling.
A Scanning Electron Micrograph (SEM) of a cross section of the coating obtained in example 1 is shown in FIG. 5. As can be seen from fig. 5, the resulting coating was almost crack-free, had a small amount of voids and was relatively dense. The cross-sectional scanning electron micrographs of the coatings obtained in examples 2 to 3 are similar to those of FIG. 5.
The oxidation resistance of the coatings prepared from the powders obtained in examples 1 to 3 and comparative examples 1 to 2 was evaluated at 1750 ℃ using an oxygen-acetylene flame, and the results of the mass loss rates are shown in table 2.
TABLE 2 Mass loss Rate results for coatings
Group of Mass loss rate (g/s)
Example 1 5.79×10 -4
Example 2 3.57×10 -4
Example 3 8.63×10 -4
Comparative example 1 2.83×10 -3
Comparative example 2 4.65×10 -3
As can be seen from Table 1, the coating prepared from the powder of the invention has a lower mass loss rate than 10 of the conventional ultrahigh-temperature ceramic coating after the coating is examined by oxyacetylene ablation -3 The magnitude indicates that the addition of the tantalum disilicide plays a role in enhancing the anti-oxidation and anti-ablation performance of the ultrahigh-temperature ceramic coating. However, when the amount of tantalum disilicide added is too large, the mass loss rate is rather high, and the high-temperature oxidation resistance of the coating is adversely affected. This indicates that the amount of tantalum disilicide added needs to be controlled within a reasonable range.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.

Claims (9)

1. The hafnium diboride-tantalum disilicide composite powder is a molten eutectic state, the components of the hafnium diboride-tantalum disilicide composite powder comprise hafnium diboride and tantalum disilicide, and the mass ratio of the hafnium diboride to the tantalum disilicide is 2-11;
the particle size of the hafnium diboride-tantalum disilicide composite powder is 10 to 80 mu m;
the preparation method of the hafnium diboride-tantalum disilicide composite powder comprises the following steps:
(1) Mixing hafnium diboride powder, tantalum disilicide powder, a binder and a polar dispersion solvent to obtain a precursor powder dispersion liquid, wherein the mass ratio of the hafnium diboride powder to the tantalum disilicide powder is (2) - (11);
(2) And sequentially carrying out granulation, spheroidization and ultrasonic treatment on the precursor powder dispersion liquid to obtain the hafnium diboride-tantalum disilicide composite powder.
2. The hafnium diboride-tantalum disilicide composite powder according to claim 1, wherein the hafnium diboride-tantalum disilicide composite powder has a flowability of 9.88 to 11.25s/50g and a bulk density of 6.19 to 6.38g/cm 3 。
3. The method for preparing the hafnium diboride-tantalum disilicide composite powder according to any one of claims 1 to 2, comprising the following steps:
(1) Mixing hafnium diboride powder, tantalum disilicide powder, a binder and a polar dispersion solvent to obtain a precursor powder dispersion liquid, wherein the mass ratio of the hafnium diboride powder to the tantalum disilicide powder is (2) - (11);
(2) And sequentially granulating, spheroidizing and carrying out ultrasonic treatment on the precursor powder dispersion liquid to obtain the hafnium diboride-tantalum disilicide composite powder.
4. The preparation method according to claim 3, wherein the particle size of the hafnium diboride powder is 1 to 3 μm; the particle size of the tantalum disilicide powder is 1 to 3 micrometers.
5. The preparation method according to claim 3, wherein the binder is polyvinyl alcohol, the alcoholysis degree of the polyvinyl alcohol is not less than 88%, and the viscosity is 8 to 10mPa.s.
6. The preparation method according to claim 3 or 5, wherein the mass percentage of the hafnium diboride powder and the tantalum disilicide powder in the precursor powder dispersion liquid in the step (1) is 35 to 60 percent, and the mass percentage of the binder is 0.4 to 0.6 percent.
7. The method according to claim 3, wherein the granulation is spray-dried granulation, and the parameters of the spray-dried granulation include:
the inlet temperature is 230 to 260 ℃;
the outlet temperature is 120 to 140 ℃;
the rotation speed of a peristaltic pump used for spray drying is 30 to 35rpm.
8. The method according to claim 3, wherein the spheroidization process is an induction plasma spheroidization process, and the parameters of the induction plasma spheroidization process comprise:
the power was 40kW, the argon flow rate was 60SCFH, and the hydrogen flow rate was 6SCFH.
9. The use of the hafnium diboride-tantalum disilicide composite powder according to any one of claims 1 to 2 or the hafnium diboride-tantalum disilicide composite powder prepared by the preparation method according to any one of claims 3 to 8 as an anti-oxidative ablative coating material.
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