CN110041061A - Polynary solid solution rare earth silicate ceramic powder and preparation method thereof - Google Patents

Polynary solid solution rare earth silicate ceramic powder and preparation method thereof Download PDF

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CN110041061A
CN110041061A CN201910411767.6A CN201910411767A CN110041061A CN 110041061 A CN110041061 A CN 110041061A CN 201910411767 A CN201910411767 A CN 201910411767A CN 110041061 A CN110041061 A CN 110041061A
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rare earth
solid solution
earth silicate
ceramic powder
silicate ceramic
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吴事江
蒋丹宇
刘家臣
巩玉贤
杨焕顺
林杨
张合军
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Zibo Xingao New Materials Research Institute Co Ltd
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    • C04B2235/3229—Cerium oxides or oxide-forming salts thereof

Abstract

The present invention relates to ultra-high temperature ceramic powder technical fields, and in particular to polynary solid solution rare earth silicate ceramic powder of one kind and preparation method thereof.Polynary solid solution rare earth silicate ceramic powder of the present invention, chemical formula are (Y0.2Yb0.2Re'0.2Re"0.2La0.2)2Si2O7, wherein Re', Re " are any two kinds in Nd, Ce, Sm, Er, Eu；Preparation method is to be mixed raw material using the method for wet-mixing, and dry, and is subsequently placed in high temperature reaction stove and is reacted, then carry out wet ball grinding, spray drying granulation, obtains polynary solid solution rare earth silicate ceramic powder.Polynary solid solution rare earth silicate ceramic powder of the invention, solid solubility is high, and high temperature resistance is good, does not decompose under hot conditions, and thermal conductivity is low, and preparation method is simple.

Description

Polynary solid solution rare earth silicate ceramic powder and preparation method thereof
Technical field
The present invention relates to ultra-high temperature ceramic powder technical fields, and in particular to a kind of polynary solid solution rare earth silicate ceramic powder Body and preparation method thereof.
Background technique
Superhigh temperature ceramics refer to (1650-2200 DEG C) under high temperature environment, and in reaction atmosphere, are able to maintain physics Compared with common carbide ceramics temperature height is not used only, to high temperature in a kind of special ceramic material of stable chemical performance Learning stability also has particular/special requirement.It is mainly used in the engine of space rocket, space round trip flying vehicle, the high ultrasound in endoatmosphere The nose cone of fast aircraft, the heat-protection system of leading edge and hypersonic speed delivery vehicle and propulsion system and metallic high temperature melting and Electrode, crucible and the associated components of continuous casting, heater element etc..
Ceramic matric composite (CMC) has many advantages, such as that high temperature resistant, low-density, high intensity, thermal stability are good, anti-oxidant, Silicon carbide fiber reinforced silicon carbide composite material (SiC at presentf/ SiC) have been used to the Leap-1A fanjet of CFM company High-pressure turbine cover ring and GE company GE9X fanjet its high-pressure turbine blade and combustion chamber.But it is sent out in aviation During the practical military service of motivation, high-temperature vapor environment can be to SiCf/ SiC ceramic matrix composite material matrix and fiber generate apparent water Steam corrosion, vapor corrosion is up to 1 μm/h at 1350 DEG C, it is therefore necessary to the Environmental Barrier Coatings on Si-based Ceramics corroded using vapour resistant (EBC) material protection SiCf/SiC composite material.
Rare earth silicate Re2Si2O7(Re is rare earth element) is high with fusing point, vapour resistant burn into thermal expansion coefficient is low, The advantages such as thermal conductivity is low are the Environmental Barrier Coatings on Si-based Ceramics materials of a kind of SiCf/SiC composite material surface having a high potential.Document 1 (Ceram.Inter.39 (2013) 5805-5811) reports β-Yb2Si2O7The synthetic method of powder.Document 2 (J.Am.Ceram.Soc.96 (2013) 3891-3900) reports β-Yb2Si2O7The preparation method and mechanics and calorifics of material Energy.Document 3 (J.Europ.Ceram.Soc.35 (2015) 3641-3650) reports β-Lu2Si2O7Preparation method, the heat of material Learn performance and mechanical property.Document 4 (Acta Mater.106 (2016) 1-14) reports the preparation of air plasma spray method Yb2Si2O7The stability of coating, mentions Yb2Si2O7Powder is readily decomposed to Yb in spraying process2SiO5, and lead to coating Cracking, influences rare earth silicate Environmental Barrier Coatings on Si-based Ceramics protecting effect.
High entropy ceramics are usually the solid solution formed by several ceramic materials with same crystal structure, are had higher High-temperature stability, lower thermal conductivity, higher hardness, therefore it is more suitable for a kind of new ceramics material of hot environment application Material.Document 5 (Scrip Mater.142 (2018) 116-120) reports the synthetic method of the high entropy ceramics of perofskite type oxide. Document 6 (J.Europ.Ceram.Soc.38 (2018) 3578-3584) reports the synthesis side of the high entropy ceramics of fluorite oxide Method.Document 7 (Scrip Mater.158 (2019) 100-104) reports the synthetic method of the high entropy ceramics of diboride.But it closes The higher cost of the golden high entropy ceramics of class, preparation process is very harsh, in military domain using more, high cost and harsh system Standby technique makes it be difficult to carry out large-scale production in factory, and application field is limited to very much.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of polynary solid solution rare earth silicate ceramic powder, The ceramic powder high temperature resistance is good, be not easily decomposed under hot conditions, thermal conductivity is low；The present invention also provides preparation method, letters Single easy, equipment input cost is low, and raw material availability is high, and the ceramic powder solid solubility of preparation is high.
Polynary solid solution rare earth silicate ceramic powder of the present invention, chemical formula are (Y0.2Yb0.2Re'0.2Re"0.2La0.2)2Si2O7, wherein Re', Re " are any two kinds in Nd, Ce, Sm, Er, Eu.
Raw material is Y2O3、Yb2O3、La2O3、SiO2And Nd2O3、Sm2O3、CeO2、Er2O3、Eu2O3In any two kinds, The granularity of raw material is 100-1000 mesh.
The molar ratio of raw material is with the molar ratio computing of element, Y:Yb:Re':Re ": La:Si=0.2:0.2:0.2:0.2:0.2: (1.0~2.0).SiO in raw material proportioning2Excessive effect is to make up SiO in high-temperature reaction process2It is lost caused by volatilization.
Preferably, raw material and its molar ratio are following several:
(1) with Y2O3、Yb2O3、Nd2O3、Sm2O3、La2O3、SiO2For raw material, molar ratio is in terms of elemental mole ratios, Y:Yb: Nd:Sm:La:Si=0.2:0.2:0.2:0.2:0.2:(1.0~2.0), reaction process are as follows:
0.2Y2O3+0.2Yb2O3+0.2Nd2O3+0.2Sm2O3+0.2La2O3+SiO2=(Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7。
(2) with Y2O3、Yb2O3、CeO2、Sm2O3、La2O3、SiO2For raw material, molar ratio is in terms of elemental mole ratios, Y:Yb: Ce:Sm:La:Si=0.2:0.2:0.2:0.2:0.2:(1.0~2.0), reaction process are as follows:
0.2Y2O3+0.2Yb2O3+0.4CeO2+0.2Sm2O3+0.2La2O3+SiO2=(Y0.2Yb0.2Ce0.2Sm0.2La0.2)2Si2O7+0.2O2(g)。
(3) with Y2O3、Yb2O3、Er2O3、Eu2O3、La2O3、SiO2For raw material, molar ratio is in terms of elemental mole ratios, Y:Yb: Er:Eu:La:Si=0.2:0.2:0.2:0.2:0.2:(1.0~2.0), reaction process are as follows:
0.2Y2O3+0.2Yb2O3+0.2Er2O3+0.2Eu2O3+0.2La2O3+SiO2=(Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7。
(4) with Y2O3、Yb2O3、Er2O3、CeO2、La2O3、SiO2For raw material, molar ratio is in terms of elemental mole ratios, Y:Yb: Er:Ce:La:Si=0.2:0.2:0.2:0.2:0.2:(1.0~2.0), reaction process are as follows:
0.2Y2O3+0.2Yb2O3+0.2Er2O3+0.4CeO2+0.2La2O3+SiO2=(Y0.2Yb0.2Ce0.2Sm0.2La0.2)2Si2O7+0.2O2(g)。
(5) with Y2O3、Yb2O3、Er2O3、Nd2O3、La2O3、SiO2For raw material, molar ratio is in terms of elemental mole ratios, Y:Yb: Er:Nd:La:Si=0.2:0.2:0.2:0.2:0.2:(1.0~2.0), reaction process are as follows:
0.2Y2O3+0.2Yb2O3+0.2Er2O3+0.2Nd2O3+0.2La2O3+SiO2=(Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7。
(6) with Y2O3、Yb2O3、CeO2、Nd2O3、La2O3、SiO2For raw material, molar ratio is in terms of elemental mole ratios, Y:Yb: Ce:Nd:La:Si=0.2:0.2:0.2:0.2:0.2:(1.0~2.0), reaction process are as follows:
0.2Y2O3+0.2Yb2O3+0.4CeO2+0.2Nd2O3+0.2La2O3+SiO2=(Y0.2Yb0.2Ce0.2Sm0.2La0.2)2Si2O7+0.2O2(g)。
The preparation method of polynary solid solution rare earth silicate ceramic powder of the present invention, steps are as follows:
(1) raw material is mixed using the method for wet-mixing, and dry, obtains mixed raw material；
(2) mixed raw material is placed in high temperature reaction stove and is reacted, obtain polynary solid solution rare earth silicate ceramic particle；
(3) polynary solid solution rare earth silicate ceramic particle is subjected to wet ball grinding, spray drying granulation, obtains polynary solid solution Rare earth silicate ceramic powder.
Wet-mixing carries out in the ball mill in step (1), and using deionized water as medium, abrading-ball is alumina balls or oxidation Zirconium ball, revolving speed 100-300r/min, time 24-48h.
Drying temperature is 25-150 DEG C, drying time 12-48h in step (1), it is dry under vacuum or ventilation condition into Row.
Reaction temperature is 1350-1700 DEG C, reaction time 2-10h in step (2), reacts the air or oxygen in flowing It is carried out under atmosphere.
The ball-milling medium of wet ball grinding is deionized water in step (3), and abrading-ball is alumina balls or zirconia ball, ball milling item Part are as follows: revolving speed 300-400r/min, Ball-milling Time 2-24h.
Spray drying granulation uses atomizer, atomizer parameter in step (3) are as follows: 160-350 DEG C of inlet temperature of atomization, out 80-120 DEG C of temperature of mouth, atomizer rotating speed 12000-18000r/min.
The polynary solid solution rare earth silicate ceramic powder of preparation is suitable for Environmental Barrier Coatings on Si-based Ceramics or ultrahigh temperature ceramic wafer, especially suitable For Environmental Barrier Coatings on Si-based Ceramics, but it is not limited only to use above.
The present invention, as basic rare earth element, adulterates any two kinds in Nd, Ce, Sm, Er, Eu using Y, Yb, La, utilizes Polynary solid solution improves the high-temperature stability of rare earth silicate, thermal conductivity reduces.In pyroreaction, Y2Si2O7It can be solid in crystal Change the various rare earth elements such as La, Yb, Nd, and when the molar ratio of five kinds of rare earth elements is 1:1:1:1:1, the ceramic powder of preparation Solid solubility is best, and the stability of crystal structure is best；When increasing or reducing the molar ratio of a certain element, ceramic powder it is each Component solid solubility is poor, influences the high-temperature stability and thermal conductivity of ceramic powder.
The process conditions of polynary solid solution rare earth silicate ceramic powder preparation process are optimized in the present invention, especially The ingredient of raw material, mixing, drying, the process conditions for reacting synthesis, ball milling and spray drying, improve polynary solid solution rare earth silicic acid The comprehensive performance of salt ceramic powder.Dry using spray atomization, obtained powder morphology is close to spherical shape, and the angle of repose of survey only has 33 °, flow of powder performance is good.
Compared with prior art, the invention has the following beneficial effects:
(1) polynary solid solution rare earth silicate ceramic powder good fluidity of the invention, solid solubility are high, high-temperature stability is good, Thermal conductivity is low, with not decomposing during thermal spraying or air plasma spray prepares coating, is suitable as SiCf/SiC、Cf/SiC、 Al2O3f/Al2O3、mulitefThe vapor coating and thermal barrier coating material resistant to high temperatures on the ceramic matric composites such as/mulite surface Material；
(2) polynary solid solution rare earth silicate ceramic powder of the invention is than single rare earth silicate thermal conductivity low and high temperature Stability is good, good in oxidation resistance, and the thermal conductivity of polynary solid solution rare earth silicate ceramic powder is 0.5-0.8W/mK, at high temperature It does not decompose after reason, 1700 DEG C of heat preservation 100h material weightlessness are lower than 0.5%；
(3) preparation method simple process of the invention, be easily achieved, using rare earth oxide and silica through overmulling Conjunction, pyroreaction, ball milling and spray drying obtain polynary solid solution rare earth silicate ceramic powder, and the polynary solid solution being prepared is dilute Native silicate ceramics powder morphology is close to spherical shape, and angle of repose is 33 °, and powder fluidity is good, solid solubility is high, high-temperature stability is good, It can be designed by the ingredient of rare earth element and adjust thermal conductivity, and particle size is adjusted by ball milling and spray drying, so that system Standby process is more flexible controllable.
Detailed description of the invention
Fig. 1 is the x-ray diffraction pattern of polynary solid solution rare earth silicate ceramic powder prepared by the embodiment of the present invention 1；
Fig. 2 is the x-ray diffraction pattern of polynary solid solution rare earth silicate ceramic powder prepared by the embodiment of the present invention 3；
Fig. 3 is the scanning electron microscope (SEM) photograph of polynary solid solution rare earth silicate ceramic powder prepared by the embodiment of the present invention 1；
Fig. 4 is the scanning electron microscope (SEM) photograph of polynary solid solution rare earth silicate ceramic powder prepared by the embodiment of the present invention 3.
Specific embodiment
The present invention will be further described with reference to embodiments, but protection scope of the present invention is not limited only to this.
Embodiment 1
Prepare polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7:
(1) molar ratio for pressing Y:Yb:Nd:Sm:La:Si=0.2:0.2:0.2:0.2:0.2:1.0, by Y2O3、Yb2O3、 Nd2O3、Sm2O3、La2O3And SiO2Raw material powder weighing, mixes 30h in deionized water medium, and the revolving speed of ball mill is 150r/ Uniformly mixed raw material is dried in vacuo 48h at a temperature of 25 DEG C, obtains mixed raw material by min；
(2) mixed raw material is placed in high temperature reaction stove, under moving air atmosphere, insulation reaction at a temperature of 1500 DEG C 10h obtains polynary solid solution rare earth silicate ceramic particle；
(3) polynary solid solution rare earth silicate ceramic particle is used into alumina balls ball milling for 24 hours in an aqueous medium, drum's speed of rotation For 300r/min；By polynary solid solution rare earth silicate ceramic powder drying-granulating in atomizer after ball milling, atomizer parameter It is set as 160 DEG C of inlet temperature, 80 DEG C of outlet temperature, revolving speed 15000r/min, 5-10 μm of granularity more are obtained after atomization drying Member solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7X-ray diffraction pattern such as Shown in Fig. 1, show that prepared material is the (Y of pure phase0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7Scanning electron microscope (SEM) photograph such as Fig. 3 It is shown, show prepared (Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7Powder morphology is close to spherical shape, of uniform size.
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7Thermal conductivity be 0.8W/ m.K。
By the polynary solid solution rare earth silicate ceramic powder (Y of preparation0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7Applied to ring Border barrier coating, concrete operations are as follows:
SiC substrate is placed in 1200 DEG C of Muffle furnaces, it will using air plasma spray (Y0.2Yb0.2Nd0.2Sm0.2La0.2)2Si2O7Powder is sprayed on substrate surface, arc power 50kW, and gas occurs for plasma gas Body is that the ratio of argon gas and air is 2:1, and the coating layer thickness of feed rate 30g/min, jet velocity 1200mm/s, acquisition are 1.5mm, thermal conductivity 0.8W/mK do not decompose in spraying process, are through 1700 DEG C of heat preservation 100h material weightlessness 0.45%.
Embodiment 2
Prepare polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Ce0.2Sm0.2La0.2)2Si2O7:
(1) molar ratio for pressing Y:Yb:Ce:Sm:La:Si=0.2:0.2:0.2:0.2:0.2:1.5, by Y2O3、Yb2O3、 CeO2、Sm2O3、La2O3And SiO2Raw material powder weighing, mixes for 24 hours in deionized water medium, and the revolving speed of ball mill is 300r/ Uniformly mixed raw material is dried 48h at a temperature of 55 DEG C, in moving air, obtains mixed raw material by min；
(2) mixed raw material is placed in high temperature reaction stove, under moving air atmosphere, insulation reaction at a temperature of 1700 DEG C 2h obtains polynary solid solution rare earth silicate ceramic particle；
(3) polynary solid solution rare earth silicate ceramic particle is used into zirconia ball ball milling 20h, drum's speed of rotation in an aqueous medium For 320r/min；By polynary solid solution rare earth silicate ceramic powder drying-granulating in atomizer after ball milling, atomizer parameter It is set as 190 DEG C of inlet temperature, 90 DEG C of outlet temperature, revolving speed 16000r/min, 15-20 μm of granularity more are obtained after atomization drying Member solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Ce0.2Sm0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Ce0.2Sm0.2La0.2)2Si2O7Thermal conductivity be 0.6W/ m·K。
Embodiment 3
Prepare polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Eu0.2La0.2)2Si2O7:
(1) molar ratio for pressing Y:Yb:Er:Eu:La:Si=0.2:0.2:0.2:0.2:0:1.5, by Y2O3、Yb2O3、 Er2O3、Eu2O3、La2O3And SiO2Raw material powder weighing, mixes 36h in deionized water medium, and the revolving speed of ball mill is 100r/ Uniformly mixed raw material is dried 36h at a temperature of 45 DEG C, in moving air, obtains mixed raw material by min；
(2) mixed raw material is placed in high temperature reaction stove, under moving air atmosphere, insulation reaction at a temperature of 1650 DEG C 5h obtains polynary solid solution rare earth silicate ceramic particle；
(3) polynary solid solution rare earth silicate ceramic particle is used into zirconia ball ball milling 2h, drum's speed of rotation in an aqueous medium For 400r/min；By polynary solid solution rare earth silicate ceramic powder drying-granulating in atomizer after ball milling, atomizer parameter It is set as 170 DEG C of inlet temperature, 80 DEG C of outlet temperature, revolving speed 15000r/min, 10-20 μm of granularity more are obtained after atomization drying Member solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Eu0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Eu0.2La0.2)2Si2O7X-ray diffraction pattern such as Shown in Fig. 2, show that prepared material is the (Y of pure phase0.2Yb0.2Er0.2Eu0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Eu0.2La0.2)2Si2O7Scanning electron microscope (SEM) photograph such as Fig. 4 It is shown, show prepared (Y0.2Yb0.2Er0.2Eu0.2La0.2)2Si2O7Powder morphology is close to spherical shape, of uniform size.
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Eu0.2La0.2)2Si2O7Thermal conductivity be 0.7W/ m·K。
Embodiment 4
Prepare polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Ce0.2La0.2)2Si2O7:
(1) molar ratio for pressing Y:Yb:Er:Ce:La:Si=0.2:0.2:0.2:0.2:0.2:1.8, by Y2O3、Yb2O3、 Er2O3、CeO2、La2O3And SiO2Raw material powder weighing, mixes 36h in deionized water medium, and the revolving speed of ball mill is 200r/ Uniformly mixed raw material is dried 48h at a temperature of 30 DEG C, in moving air, obtains mixed raw material by min；
(2) mixed raw material is placed in high temperature reaction stove, under moving air atmosphere, insulation reaction at a temperature of 1600 DEG C 8h obtains polynary solid solution rare earth silicate ceramic particle；
(3) polynary solid solution rare earth silicate ceramic particle is used into zirconia ball ball milling 5h, drum's speed of rotation in an aqueous medium For 350r/min；By polynary solid solution rare earth silicate ceramic powder drying-granulating in atomizer after ball milling, atomizer parameter It is set as 180 DEG C of inlet temperature, 80 DEG C of outlet temperature, revolving speed 12000r/min, 10-20 μm of granularity more are obtained after atomization drying Member solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Ce0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Ce0.2La0.2)2Si2O7Thermal conductivity be 0.5W/ m·K。
Embodiment 5
Prepare polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Nd0.2La0.2)2Si2O7:
(1) molar ratio for pressing Y:Yb:Nd:Sm:La:Si=0.2:0.2:0.2:0.2:0.2:2.0, by Y2O3、Yb2O3、 Nd2O3、Sm2O3、La2O3And SiO2Raw material powder weighing, mixes 30h in deionized water medium, and the revolving speed of ball mill is 250r/ Uniformly mixed raw material is dried 30h at a temperature of 40 DEG C, in moving air, obtains mixed raw material by min；
(2) mixed raw material is placed in high temperature reaction stove, under moving air atmosphere, insulation reaction at a temperature of 1680 DEG C 3h obtains polynary solid solution rare earth silicate ceramic particle；
(3) polynary solid solution rare earth silicate ceramic particle is used into zirconia ball ball milling 4h, drum's speed of rotation in an aqueous medium For 380r/min；By polynary solid solution rare earth silicate ceramic powder drying-granulating in atomizer after ball milling, atomizer parameter It is set as 250 DEG C of inlet temperature, 110 DEG C of outlet temperature, revolving speed 17000r/min, obtains 15-20 μm of granularity after atomization drying Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Nd0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Er0.2Nd0.2La0.2)2Si2O7Thermal conductivity be 0.7W/ m·K。
Embodiment 6
Prepare polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Ce0.2Nd0.2La0.2)2Si2O7:
(1) molar ratio for pressing Y:Yb:Ce:Nd:La:Si=0.2:0.2:0.2:0.2:0.2:2.0, by Y2O3、Yb2O3、 CeO2、Nd2O3、La2O3And SiO2Raw material powder weighing, mixes 28h in deionized water medium, and the revolving speed of ball mill is 180r/ Uniformly mixed raw material is dried for 24 hours at 50 °C, in moving air, obtains mixed raw material by min；
(2) mixed raw material is placed in high temperature reaction stove, under moving air atmosphere, insulation reaction at a temperature of 1550 DEG C 10h obtains polynary solid solution rare earth silicate ceramic particle；
(3) polynary solid solution rare earth silicate ceramic particle is used into alumina balls ball milling 6h, drum's speed of rotation in an aqueous medium For 360r/min；By polynary solid solution rare earth silicate ceramic powder drying-granulating in atomizer after ball milling, atomizer parameter It is set as 350 DEG C of inlet temperature, 120 DEG C of outlet temperature, revolving speed 18000r/min, 5-10 μm of granularity more are obtained after atomization drying Member solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Ce0.2Nd0.2La0.2)2Si2O7。
Polynary solid solution rare earth silicate ceramic powder (Y0.2Yb0.2Ce0.2Nd0.2La0.2)2Si2O7Thermal conductivity be 0.6W/ m·K。

Claims (10)

1. a kind of polynary solid solution rare earth silicate ceramic powder, it is characterised in that: chemical formula is (Y0.2Yb0.2Re'0.2Re"0.2La0.2)2Si2O7, wherein Re', Re " are any two kinds in Nd, Ce, Sm, Er, Eu.
2. polynary solid solution rare earth silicate ceramic powder according to claim 1, it is characterised in that: raw material Y2O3、 Yb2O3、La2O3、SiO2And Nd2O3、Sm2O3、CeO2、Er2O3、Eu2O3In any two kinds.
3. polynary solid solution rare earth silicate ceramic powder according to claim 2, it is characterised in that: the molar ratio of raw material with The molar ratio computing of element, Y:Yb:Re':Re ": La:Si=0.2:0.2:0.2:0.2:0.2:(1.0~2.0).
4. polynary solid solution rare earth silicate ceramic powder according to claim 2, it is characterised in that: the granularity of raw material is 100-1000 mesh.
5. a kind of preparation method of the described in any item polynary solid solution rare earth silicate ceramic powders of claim 1-4, feature Be: steps are as follows:
(1) raw material is mixed using the method for wet-mixing, and dry, obtains mixed raw material；
(2) mixed raw material is placed in high temperature reaction stove and is reacted, obtain high entropy rare earth silicate ceramics；
(3) high entropy rare earth silicate ceramics are subjected to wet ball grinding, spray drying granulation, obtain polynary solid solution rare earth silicate pottery Porcelain powder.
6. the preparation method of polynary solid solution rare earth silicate ceramic powder according to claim 5, it is characterised in that: step (1) wet-mixing condition in are as follows: using deionized water as medium, revolving speed 100-300r/min, time 24-48h.
7. the preparation method of polynary solid solution rare earth silicate ceramic powder according to claim 5, it is characterised in that: step (1) drying temperature is 25-150 DEG C, drying time 12-48h in, and drying carries out under vacuum or ventilation condition.
8. the preparation method of polynary solid solution rare earth silicate ceramic powder according to claim 5, it is characterised in that: step (2) reaction temperature is 1350-1700 DEG C, reaction time 2-10h in, and reaction carries out under the air or oxygen atmosphere of flowing.
9. the preparation method of polynary solid solution rare earth silicate ceramic powder according to claim 5, it is characterised in that: step (3) ball-milling medium of wet ball grinding is deionized water in, and abrading-ball is alumina balls or zirconia ball, ball milling condition are as follows: revolving speed 300-400r/min, Ball-milling Time 2-24h.
10. the preparation method of polynary solid solution rare earth silicate ceramic powder according to claim 5, it is characterised in that: step Suddenly spray drying granulation uses atomizer, atomizer parameter in (3) are as follows: 160-350 DEG C of inlet temperature of atomization, outlet temperature 80- 120 DEG C, atomizer rotating speed 12000-18000r/min.
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