CN110526716A - A kind of boride ceramics and its preparation method and application with high tenacity and high thermal conductivity - Google Patents

A kind of boride ceramics and its preparation method and application with high tenacity and high thermal conductivity Download PDF

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CN110526716A
CN110526716A CN201910727157.7A CN201910727157A CN110526716A CN 110526716 A CN110526716 A CN 110526716A CN 201910727157 A CN201910727157 A CN 201910727157A CN 110526716 A CN110526716 A CN 110526716A
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boride
powder
thermal conductivity
warming
ceramics
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袁进豪
张岩
郭伟明
吴利翔
林华泰
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Guangdong University of Technology
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Guangdong University of Technology
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Abstract

The invention belongs to technical field of ceramic material, disclose a kind of boride ceramics and its preparation method and application with high tenacity and high thermal conductivity.The boride ceramics is by ZrO2、Cr2O3The green body is warming up to 1500~1700 DEG C of calcinings under vacuum conditions, is ground up, sieved (Zr using mould pressing process by green body made of mixed powder with unformed boron powder mixing and ball millingxCry)B2Boride solid solution powder, wherein 0.75≤x≤0.95,0.05≤y≤0.25；It is filled with protective atmosphere when solid solution powder being then warming up to 1000~1400 DEG C using discharge plasma sintering, is warming up to 1800~2200 DEG C of sintering, 10~100MPa of pressurization is made.The relative density 92.4~99.6% of boride ceramics, fracture toughness are 2.43~5.94MPam1/2, thermal conductivity is 24.5~67W/ (mK).

Description

A kind of boride ceramics and its preparation method and application with high tenacity and high thermal conductivity
Technical field
The invention belongs to technical field of ceramic material, more particularly, to a kind of boronation with high tenacity and high thermal conductivity Object ceramics and its preparation method and application.
Background technique
Chromium boride is considered to have excellent corrosion resistance, but so far, still only a small number of reports in scientific literature This property in road；The investigation of most of reports all concentrates on Ti and Zr diboride.Chromium boride is the potential time of structure application The person of choosing, chromium boride can satisfy needs elevated temperature strength and stability under conditions of harsh.Chromium boride has on cutting element It is sizable to be used as hard conating possibility, and can be wear-resistant and corrosion-resistant as the protective coating of material.Add if it is used as Add agent, for improving the performance of high performance ceramic material (such as boride and carbide), but its intrinsic brittleness, undesirable antioxygen Change and thermal-shock resistance, it is difficult to which processability and poor damage tolerance are the major obstacles for hindering it to apply in extreme environment. It is reported in document, in B4After 22.5mol%CrB2 is added in C, fracture toughness is from 2.6MPam1/2Increase to 3.2MPam1/2, Bending strength is promoted to 684MPa by 170MPa.
ZrB2Base ceramic material has good mechanical property, antioxygenic property and Burning corrosion resistance energy, especially in high temperature Under mechanical property outstanding and antioxygenic property make ZrB2Base ceramic material has broad application prospects at high temperature.Because ZrB2The thermophysical property of base ceramic material has a great impact to its high-temperature behavior, so that ZrB2The ermal physics of base ceramic material Performance has obtained sufficient research.ZrB under room temperature2The thermal conductivity of base ceramic material is about 30W/ (mK), but zirconium boride is disconnected Split that toughness is low to cause it that cannot widely apply under the harsh environments such as high temperature, if the fracture toughness of zirconium boride is improved Its application will be made more extensive.However, almost without report ZrB2-CrB2Ceramics, therefore there are also very about these materials and its characteristic The place for more needing to study.
Summary of the invention
In order to solve above-mentioned the shortcomings of the prior art and disadvantage, the primary purpose of the present invention is that providing one kind has The boride ceramics of high tenacity and high thermal conductivity.The ceramics have the advantages that high tenacity, high heat conductance there are uniform solid solution phase.
Another object of the present invention is to provide the preparation method of the above-mentioned boride ceramics with high tenacity and high thermal conductivity.
Still a further object of the present invention is to provide the application of the above-mentioned boride ceramics with high tenacity and high thermal conductivity.
The purpose of the present invention is realized by following technical proposals:
A kind of boride ceramics with high tenacity and high thermal conductivity, the boride ceramics are by ZrO2、Cr2O3It is fixed with nothing The mixing of type boron powder, adds solvent and ball-milling medium, will obtain mixed powder after ball milling and drying；Using mould pressing process by mixed powder The green body is warming up to 1500~1700 DEG C under vacuum conditions and calcined by manufactured green body, and polished sieving is made (ZrxCry)B2Boride solid solution powder, wherein 0.75≤x≤0.95,0.05≤y≤0.25；Then plasma discharging is used It is sintered (ZrxCry)B2Boride solid solution powder is filled with protective atmosphere when being warming up to 1000~1400 DEG C, then heats to 1800~2200 DEG C of sintering, 10~100MPa of pressurization are made.
Preferably, the relative density 92.4~99.6% of the boride ceramics, fracture toughness are 2.43~5.94MPa m1/2, thermal conductivity is 24.5~67W/ (mK).
Preferably, the ZrO2And Cr2O3Purity be 99.0~99.9wt%, ZrO2And Cr2O3Partial size be 0.1~10 μm, the purity of the unformed boron powder is 95~99wt%, and the partial size of the unformed boron powder is 0.1~10 μm.
Preferably, the described (ZrxCry)B2The partial size of boride solid solution powder is 0.1~1 μm, (the ZrxCry)B2Boron The oxygen content of compound solid solution powder is 0.01~0.1wt%.
Preferably, the unformed boron powder and ZrO2Molar ratio be (3~5): 1, the unformed boron powder and Cr2O3's Molar ratio is (6~8): 1.
Preferably, the solvent is one or more of ethyl alcohol, acetone, methanol or butanol；The ball-milling medium is Si3N4、 WC or ZrO2。
Preferably, the protective atmosphere is N2Or Ar.
Preferably, the time of the ball milling is 10~48h, and the pressure of the molding is 1~10MPa, the molding when Between be 1~10min, the rate for being warming up to 1500~1700 DEG C is 5~20 DEG C/min, time of the calcining is 0.5~ 3h。
Preferably, the rate of the heating for being warming up to 1000~1400 DEG C and being warming up to 1800~2200 DEG C is 100 ~400 DEG C/min, the time of the sintering is 1~30min.
The preparation method of the boride ceramics with high tenacity and high thermal conductivity, comprises the following specific steps that:
S1. by ZrO2、Cr2O3Solvent is added with unformed boron powder and ball-milling medium is mixed, 10 are mixed on ball mill ~48h obtains mixed powder after dry；
S2. the green body after mixed powder being molded is put into graphite crucible, is warming up to 1500 with the rate of 5~20 DEG C/min ~1700 DEG C of 0.5~3h of heat preservation, obtain (ZrxCry)B2Solid solution powder；
S3. it is sieved after grinding and (Zr is madexCry)B2Boride solid solution powder is put into graphite jig, using electric discharge etc. Ion sintering fills protective atmosphere when being warming up to 1000~1400 DEG C with 100~400 DEG C/min rate, then with 100~400 DEG C/min Rate is warming up to 1800~2200 DEG C of sintering, keeps the temperature 1~30min, and pressurize 10~100MPa, and (Zr is madexCry)B2Boride pottery Porcelain.
Application of the boride ceramics with high tenacity and high thermal conductivity in superhigh temperature stealth material field.
A kind of boride ceramics with high tenacity and high thermal conductivity of the invention is by two kinds of metal oxides and unformed Boron powder is material powder, and two-spot metal oxide obtains (Zr after Overheating TreatmentxCry)B2Boride powder, it is solid between Zr, Cr It is molten, solid solution powder is prepared, acceleration of sintering densification improves material property.
Compared with prior art, the invention has the following advantages:
1. the present invention is prepared for (Zr using boron thermal reduction methodxCry)B2Boride solid solution powder, passes through plasma discharging Sintering prepares (ZrxCry)B2Borides, the powder grain size is small, and ingredient is uniform, and is solid solution powder, compares In commercially available boride powder purity is high, component is uniform, and it is solid solution powder, has reached the chemistry side of raw material powder The uniformity in face, it is simpler than a variety of borides it is mechanical mix the physical uniformity reached advantageously, and it is also into one Step acceleration of sintering ceramic material consolidates the formation of melt-phase, acceleration of sintering densification.
2. the present invention realizes (Zr using SPSxCry)B2The quick densifying of boride ceramics greatly shortens crystal grain and grows up Time can get the tiny ceramics of the crystal grain, (Zr being sintered outxCry)B2Borides fine microstructures, bigger raising The performance of material.
3. the present invention uses CrB2It is melted admittedly as the second phase, since it has good thermal conductivity and corrosion resistance, so that (ZrxCry)B2The heating conduction and corrosion resistance of borides get a promotion.
4. the present invention is by ZrB2Admittedly CrB is melted in middle original position2, directly prepare (ZrxCry)B2Solid solution powder can promote It is spread into atom, improves sintering characteristic, further increase the thermal conductivity of material, and CrB2Addition increase the energy of crystal boundary, So that fracture toughness increases.
Detailed description of the invention
Fig. 1 is (Zr in embodiment 50.95Cr0.05)B2The XRD spectrum of boride ceramic powders.
Fig. 2 is (Zr in embodiment 50.95Cr0.05)B2The SEM photograph of boride ceramic powders.
Fig. 3 is (Zr in embodiment 50.95Cr0.05)B2The fracture apperance of boride ceramics.
Fig. 4 is (Zr in embodiment 50.95Cr0.05)B2The burnishing surface of boride ceramics corrodes photo.
Fig. 5 is ZrB in comparative example 12The fracture apperance of ceramics.
Fig. 6 is ZrB in comparative example 12The burnishing surface of ceramics corrodes photo.
Specific embodiment
The contents of the present invention are further illustrated combined with specific embodiments below, but should not be construed as limiting the invention. Unless otherwise specified, the conventional means that technological means used in embodiment is well known to those skilled in the art.Except non-specifically Illustrate, reagent that the present invention uses, method and apparatus is the art conventional reagents, method and apparatus.
Embodiment 1
1. with ZrO2(purity 99.9% of powder, 1 μm of partial size), Cr2O3(purity 99.9% of powder, 1 μm of partial size) powder It is raw material, unformed boron powder and ZrO with unformed boron powder (purity 96.3%, 1 μm of partial size)2Molar ratio be 5:1, unformed boron Powder and Cr2O3Molar ratio be 7:1, using ethyl alcohol as solvent, with Si3N4Ball is ball-milling medium, is mixed on roll-type ball mill for 24 hours, Mixed powder is obtained after mixing, drying.
2. the green body after mixed-powder is molded 2min with the pressure of 3MPa is put into graphite crucible, with the speed of 15 DEG C/min Rate is warming up to 1700 DEG C of heat preservation 1h, and after vacuum heat treatment, polished sieving obtains (Zr0.75Cr0.25)B2Boride solid solution Powder.
3. by (Zr0.75Cr0.25)B2Boride solid solution powder is material powder, is put it into graphite jig, with 200 DEG C/temperature rises to 2000 DEG C by min heating rate, 10min is kept the temperature, pressurize 30MPa, fills Ar gas at 1100 DEG C, passes through electric discharge Plasma (SPS) sintering, is made (Zr0.75Cr0.25)B2Boride ceramics.
(the Zr that the present embodiment obtains is measured by laser particle size analysis0.75Cr0.25)B2The partial size of boride solid solution powder It is 0.13 μm, (the Zr0.75Cr0.25)B2Oxygen content in boride solid solution powder is 0.01wt%, gained boride ceramics Relative density 99.6%, fracture toughness 5.94MPam1/2, thermal conductivity 67W/ (mK).
Embodiment 2
1. with ZrO2(purity 99.7% of powder, 1 μm of partial size), Cr2O3(purity 99.7% of powder, 2 μm of partial size) powder It is raw material, unformed boron powder and ZrO with unformed boron powder (purity 97.5%, 2 μm of partial size)2Molar ratio be 4:1, unformed boron Powder and Cr2O3Molar ratio be 6:1, using ethyl alcohol as solvent, with Si3N4Ball is ball-milling medium, mixes 26h on roll-type ball mill, Mixed powder is obtained after mixing, drying.
2. the green body after mixed-powder is molded 3min with the pressure of 5MPa is put into graphite crucible, with the speed of 5 DEG C/min Rate is warming up to 1500 DEG C of heat preservation 2h, and after vacuum heat treatment, polished sieving obtains (Zr0.80Cr0.20)B2Boride solid solution Powder.
3. by (Zr0.80Cr0.20)B2Boride solid solution powder is material powder, is put it into graphite jig, with 250 DEG C/temperature rises to 1900 DEG C by min heating rate, 7min is kept the temperature, pressurize 50MPa, fills Ar gas at 1200 DEG C, passes through electric discharge etc. Ion (SPS) sintering, is made (Zr0.80Cr0.20)B2Boride ceramics.
(the Zr that the present embodiment obtains is measured by laser particle size analysis0.80Cr0.20)B2The partial size of boride solid solution powder It is 0.25 μm, (the Zr0.80Cr0.20)B2Oxygen content in boride solid solution powder is 0.03wt%, gained boride pottery Porcelain relative density 98.2%, fracture toughness 5.04MPam1/2, thermal conductivity 48W/ (mK).
Embodiment 3
1. with ZrO2(purity 99.5% of powder, 1 μm of partial size), Cr2O3(purity 99.9% of powder, 2 μm of partial size) powder It is raw material, unformed boron powder and ZrO with unformed boron powder (purity 95.6%, 1 μm of partial size)2Molar ratio be 4:1, unformed boron Powder and Cr2O3Molar ratio be 8:1, using ethyl alcohol as solvent, with ZrO2Ball is ball-milling medium, mixes 22h on roll-type ball mill, Mixed powder is obtained after mixing, drying.
2. the green body after mixed-powder is molded 5min with the pressure of 8MPa is put into graphite crucible, with the speed of 10 DEG C/min Rate is warming up to 1600 DEG C of heat preservation 2h, and after vacuum heat treatment, polished sieving obtains (Zr0.85Cr0.15)B2Boride solid solution Powder.
3. by (Zr0.85Cr0.15)B2Boride solid solution powder is material powder, is put it into graphite jig, with 300 DEG C/temperature rises to 1800 DEG C by min heating rate, 6min is kept the temperature, pressurize 30MPa, fills N at 1300 DEG C2Gas passes through electric discharge etc. Ion (SPS) sintering, is made (Zr0.85Cr0.15)B2Boride ceramics.
(the Zr that the present embodiment obtains is measured by laser particle size analysis0.85Cr0.15)B2The partial size of boride solid solution powder It is 0.31 μm, (the Zr0.85Cr0.15)B2Oxygen content in boride solid solution powder is 0.04wt%, gained boride ceramics Relative density 97.7%, fracture toughness 4.65MPam1/2, thermal conductivity 40W/ (mK).
Embodiment 4
1. with ZrO2(purity 99.2% of powder, 3 μm of partial size), Cr2O3(purity 99.7% of powder, 1 μm of partial size) powder It is raw material, unformed boron powder and ZrO with unformed boron powder (purity 98.9%, 2 μm of partial size)2Molar ratio be 4:1, it is unformed Boron powder and Cr2O3Molar ratio be 7:1, using ethyl alcohol as solvent, with ZrO2Ball is ball-milling medium, is mixed on roll-type ball mill 26h obtains mixed powder after mixing, drying.
2. the green body after mixed-powder is molded 3min with the pressure of 5MPa is put into graphite crucible, with the speed of 5 DEG C/min Rate is warming up to 1500 DEG C of heat preservation 2h, and after vacuum heat treatment, polished sieving obtains (Zr0.90Cr0.10)B2Boride solid solution Powder.
3. by (Zr0.90Cr0.10)B2Boride solid solution powder is material powder, is put it into graphite jig, with 200 DEG C/temperature rises to 2000 DEG C by min heating rate, 20min is kept the temperature, pressurize 50MPa, fills N at 1200 DEG C2Gas passes through electric discharge Plasma (SPS) sintering, is made (Zr0.90Cr0.10)B2Boride ceramics.
(the Zr that the present embodiment obtains is measured by laser particle size analysis0.90Cr0.10)B2Boride ceramics solid solution powder Partial size is 0.38 μm, (the Zr0.90Cr0.10)B2Oxygen content in boride solid solution powder is 0.04wt%, gained boride Ceramic relative density 96.6%, fracture toughness 4.09MPam1/2, thermal conductivity 37W/ (mK).
Embodiment 5
1. with ZrO2(purity 99.9% of powder, 1 μm of partial size), Cr2O3(purity 99.9% of powder, 1 μm of partial size) powder It is raw material, unformed boron powder and ZrO with unformed boron powder (purity 95.6%, 1 μm of partial size)2Molar ratio be 4:1, unformed boron Powder and Cr2O3Molar ratio be 7:1, using ethyl alcohol as solvent, using WC ball as ball-milling medium, mixed on roll-type ball mill for 24 hours, warp Mixed powder is obtained after mixing, drying.
2. the green body after mixed-powder is molded 1min with the pressure of 2MPa is put into graphite crucible, with the speed of 10 DEG C/min Rate is warming up to 1600 DEG C of heat preservation 1h, and after vacuum heat treatment, polished sieving obtains (Zr0.95Cr0.05)B2Boride solid solution Powder.
3. by (Zr0.95Cr0.05)B2Boride solid solution powder is material powder, is put it into graphite jig, with 150 DEG C/temperature rises to 2000 DEG C by min heating rate, 5min is kept the temperature, pressurize 30MPa, fills Ar gas at 1200 DEG C, passes through electric discharge etc. Ion (SPS) sintering, is made (Zr0.95Cr0.05)B2Boride ceramics.
(the Zr that the present embodiment obtains is measured by laser particle size analysis0.95Cr0.05)B2The partial size of boride ceramic powders is 0.44 μm, (the Zr0.95Cr0.05)B2Oxygen content in boride powder is 0.06wt%, gained boride ceramics relative density 95.3%, fracture toughness 2.9MPam1/2, thermal conductivity 29W/ (mK).
Fig. 1 is (Zr in the present embodiment0.95Cr0.05)B2The XRD spectrum of boride solid solution powder, can from Fig. 1 Out, (Zr has been only detected0.95Cr0.05)B2Independent ZrO is not detected in the peak of solid solution2Or Cr2O3Peak, it was demonstrated that boron heat is anti- Independent ZrB also should be not detected completely2Or CrB2Peak, it was demonstrated that ZrB2With CrB2Gu it is molten complete, successfully prepare (Zr0.95Cr0.05)B2Boride solid solution powder.Fig. 2 is (Zr in the present embodiment0.95Cr0.05)B2Boride solid solution powder SEM photograph, as can be seen from Figure 2 its is in irregular shape, and particle diameter distribution is uniform, and particle is tiny.Fig. 3 is in the present embodiment (Zr0.95Cr0.05)B2The fracture apperance of boride ceramics, from figure 3, it can be seen that the fracture mode of boride ceramics is edge The hybrid fracture of crystalline substance fracture and transgranular fracture has partial rivers style and a small amount of crystal grain to extract phenomenon, therefore its toughness has centainly Raising, entire fracture apperance color is uniform, illustrates after discharge plasma sintering, (Zr0.95Cr0.05)B2Boride ceramics is only There are single-phases, consistent with XRD result, and it only has a small amount of stomata, successfully prepare fine and close (Zr0.95Cr0.05)B2Boronation Object ceramics, up to 95.3% consistency can also improve its heating conduction.Fig. 4 is (Zr in the present embodiment0.95Cr0.05)B2Boronation The corrosion photo of the burnishing surface of object ceramics as can be seen from Figure 4 passes through the acid corrosion (HF:HNO of 60s3:H2O=1:1:3 after), Material surface only has slight evidence of corrosion, and the zanjon gully of corrosion-free mistake, illustrates ZrB2Admittedly after molten Cr, (Zr0.95Cr0.05)B2 The resistance to corrosion of boride ceramics improves.
Comparative example 1
1. with ZrO2(purity 99.5% of powder, 2 μm of partial size) and unformed boron powder (purity 98.9%, 4 μm of partial size) is Raw material, unformed boron powder and ZrO2Molar ratio be 4:1, unformed boron powder and Cr2O3Molar ratio be 8:1, with ethyl alcohol be it is molten Agent, with Si3N4Ball is ball-milling medium, is mixed for 24 hours on roll-type ball mill, obtains mixed powder after mixing, drying.
2. the green body after mixed-powder is molded 3min with the pressure of 5MPa is put into graphite crucible, with the speed of 5 DEG C/min Rate is warming up to 1600 DEG C of heat preservation 3h, and after vacuum heat treatment, polished sieving obtains ZrB2Boronation zirconium powder.
3. by ZrB2Boronation zirconium powder is material powder, is put it into graphite jig, will with 300 DEG C/min heating rate Temperature rises to 1800 DEG C, keeps the temperature 30min, and pressurize 40MPa, fills N at 1100 DEG C2Gas is sintered by plasma discharging (SPS), ZrB is made2Zirconium boride ceramic.
The ZrB that the present embodiment obtains is measured by laser particle size analysis2The partial size of boronation zirconium powder is 0.97 μm, described ZrB2Oxygen content in boronation zirconium powder is 0.09wt%, the relative density 92.4% of gained zirconium boride ceramic, and fracture toughness is 2.43MPa·m1/2, thermal conductivity 24.5W/ (mK).
Fig. 5 is ZrB in this comparative example2The fracture apperance of ceramics, from figure 5 it can be seen that ZrB2The fracture mode of ceramics is equal For grain boundary fracture, therefore its toughness is lower, and brittleness is larger, and there are a large amount of stomatas, illustrates pure ZrB2Ceramics are difficult densified sintering product.Fig. 6 For ZrB in this comparative example2Ceramics burnishing surface corrode photo, as can be seen from Figure 6 by 1min30s acid corrosion (HF: HNO3:H2O=1:1:3 after), ZrB2Ceramic surface has a large amount of evidence of corrosion, and the zanjon gully corroded occurs, it was demonstrated that pure ZrB2The resistance to corrosion of ceramics is poor.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, it is other it is any without departing from the spirit and principles of the present invention made by change, modification, substitution, combination and simplify, It should be equivalent substitute mode, be included within the scope of the present invention.

Claims (10)

1. a kind of boride ceramics with high tenacity and high thermal conductivity, which is characterized in that the boride ceramics is by ZrO2、 Cr2O3It is mixed with unformed boron powder, adds solvent and ball-milling medium, mixed powder will be obtained after ball milling and drying；Using mould pressing process By green body made of mixed powder, the green body is warming up to 1500~1700 DEG C under vacuum conditions and is calcined, it is polished It is sieved and (Zr is madexCry)B2Boride solid solution powder, wherein 0.75≤x≤0.95,0.05≤y≤0.25；Then it uses and puts Electric plasma agglomeration is by (ZrxCry)B2Boride powder is filled with protective atmosphere when being warming up to 1000~1400 DEG C, then heats to 1800~2200 DEG C of sintering, 10~100MPa of pressurization are made.
2. the boride ceramics according to claim 1 with high tenacity and high thermal conductivity, which is characterized in that described unformed Boron powder and ZrO2Molar ratio be (3~5): 1, the unformed boron powder and Cr2O3Molar ratio be (6~8): 1.
3. the boride ceramics according to claim 1 with high tenacity and high thermal conductivity, which is characterized in that gained boride The relative density of ceramics is 92.4~99.6%, and fracture toughness is 2.43~5.94MPam1/2, thermal conductivity is 24.5~67W/ (m·K)。
4. the boride ceramics according to claim 1 with high tenacity and high thermal conductivity, which is characterized in that described (ZrxCry)B2The partial size of boride solid solution powder is 0.1~1 μm, (the ZrxCry)B2The oxygen of boride solid solution powder contains Amount is 0.01~0.1wt%.
5. the boride ceramics according to claim 1 with high tenacity and high thermal conductivity, which is characterized in that the solvent is One or more of ethyl alcohol, acetone, methanol or butanol；The ball-milling medium is Si3N4, WC or ZrO2。
6. the boride ceramics according to claim 1 with high tenacity and high thermal conductivity, which is characterized in that the protection gas Atmosphere is N2Or Ar.
7. it is according to claim 1 have high tenacity and high thermal conductivity boride ceramics, which is characterized in that the ball milling when Between be 10~48h, the pressure of the molding is 1~10MPa, and the time of the molding is 1~10min, described to be warming up to 1500 ~1700 DEG C of rate is 5~20 DEG C/min, and the time of the calcining is 0.5~3h.
8. according to claim 1 have high tenacity and high thermal conductivity boride ceramics, which is characterized in that described to be warming up to The rate of 1000~1400 DEG C and the heating that is warming up to 1800~2200 DEG C is 100~400 DEG C/min, the time of the sintering For 1~30min.
9. the preparation method of the boride ceramics according to claim 1-8 with high tenacity and high thermal conductivity, It is characterized in that, comprises the following specific steps that:
S1. by ZrO2、Cr2O3Solvent and ball-milling medium is added with unformed boron powder to be mixed, mix 10 on ball mill~ 48h obtains mixed powder after dry；
S2. the green body after mixed powder being molded is put into graphite crucible, 1500 are warming up to the rate of 5~20 DEG C/min~ 1700 DEG C of 0.5~3h of heat preservation, obtain (ZrxCry)B2Solid solution powder；
S3. it is sieved after grinding and (Zr is madexCry)B2Boride solid solution powder is put into graphite jig, using plasma discharging Sintering fills protective atmosphere when being warming up to 1000~1400 DEG C with 100~400 DEG C/min rate, then with 100~400 DEG C/min rate 1800~2200 DEG C of sintering are warming up to, 1~30min is kept the temperature, pressurize 10~100MPa, and (Zr is madexCry)B2Boride ceramics.
10. the boride ceramics with high tenacity and high thermal conductivity described in any one of claim 1~8 is led in superhigh temperature stealth material Application in domain.
CN201910727157.7A 2019-08-07 2019-08-07 A kind of boride ceramics and its preparation method and application with high tenacity and high thermal conductivity Pending CN110526716A (en)

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