CN109231973A - Complex phase ceramic insulating part and preparation method thereof - Google Patents
Complex phase ceramic insulating part and preparation method thereof Download PDFInfo
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- CN109231973A CN109231973A CN201811291723.6A CN201811291723A CN109231973A CN 109231973 A CN109231973 A CN 109231973A CN 201811291723 A CN201811291723 A CN 201811291723A CN 109231973 A CN109231973 A CN 109231973A
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Abstract
The present invention relates to a kind of complex phase ceramic insulating parts and preparation method thereof.Wherein, the raw material for preparing the complex phase ceramic insulating part includes alpha-phase aluminum oxide, yttrium oxide and hexagonal boron nitride cladding molybdenum composite powder, the weight of the hexagonal boron nitride cladding molybdenum composite powder accounts for the 7.5%~22.5% of the sum of weight of the alpha-phase aluminum oxide and hexagonal boron nitride cladding molybdenum, and the weight of the yttrium oxide is that the alpha-phase aluminum oxide and the hexagonal boron nitride coat the 3%~8% of the sum of weight of molybdenum composite powder.The complex phase ceramic insulating part is with α-AL2O3For basis material, suitable h-BN cladding Mo composite powder and Y are added2O3, ceramic insulator is formed through sintering；The thermal shock resistance of ceramic insulator is improved by the Mo with thermal conductive resin, to make it have preferable thermal shock resistance and higher mechanical strength.
Description
Technical field
The present invention relates to power cable industries, more particularly to a kind of complex phase ceramic insulating part and preparation method thereof.
Background technique
With the rapid development of the national economy, the scale of electric power networks is also going from strength to strength.At the same time, people are to power supply
Reliability requirement it is also higher and higher, this requires capable of reliablely and stablely running for a long time for all devices in electric power networks.
Insulator is determined in standard GB/T/T2009.B -1995 " electrotechnical terminology insulator " as a kind of important power equipment
Justice are as follows: the device for insulating and being mechanically fixed for the electrical equipment or conductor electrical for being in different potentials.Insulator is the upper gold of equipment
Belong to the insulating materials of the certain shapes of attachment.Since electroporcelain material has certain mechanical strength, cold and hot acute degeneration, insulation are excellent
Performance, high chemical stability, long-term work are still able to maintain mechanical strength and the constant characteristic of electrical strength, and become insulation
The widest material of son.The external insulation of most of high-tension apparatus all uses electroceramics.In addition, presently, there are there are also tempering glass
Glass insulator and organic insulation.Although the mechanical strength and electrical strength of toughened glass insulator can be more than electroceramics,
It is difficult to be formed greatly and the product of complex contour, thus can not shake the leading position of electric porcelain insulator.Organic insulation often with
Silicon rubber is outer insulating material, and silicon rubber is easy to form, and electrical strength is good, but itself does not have mechanical strength, needs and resin
Material constitutes composite insulating material, in addition, the ageing resistance of organic insulation also can not show a candle to electroceramics and glass insulator.It is comprehensive next
It sees, electroceramics still has the status that can not replace in the application of power industry.
Insulator can be divided into according to purposes: line insulator, insulator for station and casing three categories.So far, porcelain
Casing does not occur alternative product also as the structural member of hv cable termination.However, electroceramics is fragile material, in the work of tensile stress
It is easily broken off under.In addition, the bending strength of cable termination insulator used in power grid is 150Mpa~200Mpa, heat resistanceheat resistant at present
The shake temperature difference is generally below 200 DEG C, the problem of generally existing thermal shock resistance difference, in the case where thermal shock acts on its intensity can significantly under
Drop, this just greatly reduces the reliability that structure member uses.Even in the case where insulator internal-external temperature difference is big, cable termination
Insulator may be burst since thermal stress is excessive, to cause accident and influence the stability and reliability of power supply.In power grid
The analysis and research of related accidents also indicate that, electric power accident relevant to insulator be often as ambient temperature acute variation,
The factors such as line fault or maloperation cause to generate the biggish temperature difference inside and outside insulator, to make to generate in insulator larger
Thermal stress is so that insulator bursts or generate visible crack so as to cause the generation of consequent malfunction.
In order to improve the property of electroceramics, improving electroporcelain material using multiphase structure to form interface special between two-phase
The research of aspect of performance has been achieved with greater advance, and research work is also more deep.But resulting electroceramics is in power so far
It is also unsatisfactory to learn aspect of performance, some other performance, as thermal shock resistance need to be improved.
Summary of the invention
Based on this, it is necessary to provide complex phase a kind of while that there is good thermal shock resistance and preferable mechanical performance
Ceramic insulator.
A kind of complex phase ceramic insulating part, prepare the complex phase ceramic insulating part raw material include alpha-phase aluminum oxide, yttrium oxide he
Hexagonal boron nitride coats molybdenum composite powder, the weight of hexagonal boron nitride cladding molybdenum composite powder account for the alpha-phase aluminum oxide and
The 7.5%~22.5% of the sum of the weight of the hexagonal boron nitride cladding molybdenum composite powder, the weight of the yttrium oxide is the α
Phase alumina and the hexagonal boron nitride coat the 3%~8% of the sum of weight of molybdenum composite powder.
The above-mentioned complex phase ceramic insulating part of the present invention, with high with fusing point, hardness is big, resistant to chemical etching, excellent dielectric etc.
Alpha-phase aluminum oxide (α-the Al of characteristic2O3) it is basis material, by α-Al2O3Suitable hexagonal boron nitride (h- is added in matrix
BN molybdenum (Mo) composite powder intensity and sintering aid yttrium oxide (Y) are coated2O3), ceramic insulator is formed through sintering；Wherein, metal
The thermal shock resistance that there is molybdenum good thermal conductivity ceramic insulator can be improved, and hexagonal boron nitride is used to coat metal molybdenum
The insulation performance of ceramic insulator can be influenced to avoid metal, thus α phase basis material in add suitable six sides nitrogen
Change boron and coat molybdenum composite powder, the thermal shock resistance that can be very good to improve ceramic insulator will not influence its insulating properties again
Can, to make ceramic insulator that there is good thermal shock resistance and higher mechanical strength, cable can be greatlyd improve
Terminal operating stability and reliability can provide strong guarantee for the reliable and stable operation of electric system.
It is appreciated that the weight of the hexagonal boron nitride cladding molybdenum composite powder accounts for the alpha-phase aluminum oxide and six side
Boron nitride coats the 7.5%~22.5% of the sum of weight of molybdenum composite powder, then the weight of the alpha-phase aluminum oxide accounts for the α phase
The 77.5%~92.5% of the sum of the weight of aluminium oxide and the hexagonal boron nitride.
The weight of the hexagonal boron nitride cladding molybdenum composite powder accounts for the alpha-phase aluminum oxide in one of the embodiments,
With the 10%~18% of the sum of hexagonal boron nitride cladding molybdenum composite powder weight.
The weight of hexagonal boron nitride in the hexagonal boron nitride cladding molybdenum composite powder and molybdenum in one of the embodiments,
Amount is than being (1.8~2): 1.In this way, can be very good to realize that hexagonal boron nitride cladding molybdenum makes metal molybdenum lose electric conductivity, thus
The insulation performance of ceramic insulator will not be reduced；And hexagonal boron nitride modulus it is lower and have anisotropic expansion coefficient,
With basis material α-Al2O3Modulus and expansion system differ greatly, micro-crack can be formed during the sintering process, further mentioned
The thermal shock resistance of high ceramic insulator.
The hexagonal boron nitride coats molybdenum composite powder Nano grade in one of the embodiments,.
More preferably, the partial size of the hexagonal boron nitride cladding molybdenum composite powder is 50nm~200nm.
Further, in hexagonal boron nitride cladding molybdenum composite powder, it is coated on the hexagonal boron nitride on molybdenum powder surface
Partial size be 20nm~30nm.
It is introduced into ceramic matrix using nanoscale h-BN cladding Mo composite powder, and h-BN and α-Al2O3Surface have compared with
The amalgamation of good chemical compatibility and plane of crystal, can be good at playing material toughening effect, improves its heat shock resistance
Performance.
The complex phase ceramic insulating part can be cable termination insulator in one of the embodiments,.
Another object of the present invention is to provide a kind of preparation method of above-mentioned complex phase ceramic insulating part.
A kind of preparation method of complex phase ceramic insulating part, comprising the following steps:
Ceramic powder is provided, the ceramic powder includes alpha-phase aluminum oxide, yttrium oxide and hexagonal boron nitride cladding molybdenum composite powder
End, the weight of the hexagonal boron nitride cladding molybdenum composite powder accounts for the alpha-phase aluminum oxide and hexagonal boron nitride cladding molybdenum is multiple
The 7.5%~22.5% of the sum of weight of powder is closed, the weight of the yttrium oxide is that the alpha-phase aluminum oxide and six side nitrogenize
Boron coats the 3%~8% of the sum of weight of molybdenum composite powder；
The ceramic powder is pressed into ceramic insulator green body；
The ceramic insulator green body is sintered 5~12 hours under the conditions of atmosphere of hydrogen, 1650 DEG C~1800 DEG C of temperature,
Obtain the complex phase ceramic insulating part.
Since the thermal shock resistance of ceramic insulator can be improved in metal Mo thermal conductivity with higher, and use h-BN
Coat Mo can influence to avoid metal Mo to the insulating properties of ceramic insulator, and h-BN and α-AL2O3Expansion coefficient difference
Greatly, therefore α-AL2O3Add suitable hexagonal boron nitride cladding molybdenum composite powder in basis material, ceramic insulator in sintering and
Suitable micro-crack effect can be also generated in subsequent cooling procedure, further increase the thermal shock resistance of ceramic insulator；And
Calcining required temperature on the one hand can be reduced using yttrium oxide as sintering aid, is on the other hand conducive to improve the strong of ceramic material
Degree, so, the above method of the present invention is with α-AL2O3For basis material, suitable h-BN cladding Mo composite powder and Y are added2O3,
It can make ceramic insulator under the premise of guaranteeing does not reduce the insulation performance of ceramic insulator in conjunction with compacting and sintering process
With good thermal shock resistance and higher mechanical strength, cable termination operation stability and reliable can be greatlyd improve
Property, strong guarantee can be provided for the reliable and stable operation of electric system.
The weight of the hexagonal boron nitride cladding molybdenum composite powder accounts for the alpha-phase aluminum oxide in one of the embodiments,
With the 10%~18% of the sum of hexagonal boron nitride cladding molybdenum composite powder weight.
The preparation method of the complex phase ceramic insulating part further includes preparing the six sides nitridation in one of the embodiments,
Boron coats the step of molybdenum composite powder:
Molybdenum powder is mixed with boric acid and urea, using ethyl alcohol as medium ball milling 24~50 hours, ultrasonic disperse, removal ethyl alcohol are simultaneously
After drying, mixture is obtained；
By the mixture in air or hydrogen, after 500 DEG C~700 DEG C progress first time calcinings, in nitrogen atmosphere
In carry out second in 800 DEG C~1000 DEG C and calcine.
Nanoscale h- is generated by controlling the dosage and calcination condition of each raw material using boric acid and urea as boron nitride source
BN is evenly coated at metal molybdenum particle surface, forms close wrapping layer.In this way, being formed uniformly in metal molybdenum powder particle surface
, the nanoscale h-BN wrapping layer of suitable depth, can further improve the toughness and mechanical strength of ceramic insulator, make simultaneously
Metal molybdenum powder loses electric conductivity in a certain range.
Further, the molar ratio of the urea, the boric acid and the molybdenum powder is (30~40): (18~20): 1.Such as
This, by controlling the additive amount of each raw material, makes resulting nanometer h-BN packet during hexagonal boron nitride coats molybdenum composite powder
The weight ratio for covering h-BN and Mo in molybdenum composite powder is (1.8~2.2): 1.
Specifically, the removal ethyl alcohol and drying are after removing the ethyl alcohol using Rotary Evaporators, to be placed in 98 DEG C~102
DEG C vacuum oven 10~12 hours.
The step of first time calcines in one of the embodiments, are as follows: by the mixture in air or hydrogen,
500 DEG C~700 DEG C are heated to fix heating rate to be calcined.
The fixed heating rate is 1 DEG C/min~3 DEG C/min in one of the embodiments,.
Further, the first time calcination time is 20~25 hours, and second of calcination time is 5~10 small
When.Hexagonal boron nitride is so generated by secondary calcination reaction twice and is closely coated on metal molybdenum powder surface, obtains nano-hexagonal
Boron nitride coats molybdenum composite powder.
Further include the steps that preparing the ceramic powder in one of the embodiments:
The each component of the ceramic powder and ethyl alcohol are mixed, after ultrasonic disperse, ball milling 24~48 hours, then remove second
Alcohol, after grinding 60~120 minutes, sieving, spray drying.
Ethyl alcohol is added in mechanical milling process, the surface that can reduce material powder surface is avoided that powder generates reunion；And
Ethyl alcohol is easy to volatilize convenient for subsequent removal, not will increase the moisture content of material powder, moreover it is possible to play cooling to a certain extent
Effect.
Further, the time of the ultrasonic disperse is 15~30 minutes.
The step of sieving controls the partial size of the ceramic powder less than 360 mesh in one of the embodiments,.
The described the step of ceramic powder is pressed into ceramic insulator green body in one of the embodiments, are as follows: will
The ceramic powder, through cold isostatic compaction, obtains the ceramic insulator green body under the conditions of 230MPa~250MPa.
The preparation method of the complex phase ceramic insulating part further includes the acquisition of alpha-phase aluminum oxide in one of the embodiments,
Step:
Alumina powder is calcined 10~15 hours under air atmosphere in 1500 DEG C~1650 DEG C.
Specifically, high-purity technical alumina powder (Al of the content 99.5% or more for being 1 μm~5 μm by partial size2O3),
Under air atmosphere after 1500 DEG C~1650 DEG C are calcined 10~15 hours, it is fully ground.
Specific embodiment
To facilitate the understanding of the present invention, below will to invention is more fully described, and give it is of the invention compared with
Good embodiment.But the invention can be realized in many different forms, however it is not limited to embodiment described herein.Phase
Instead, purpose of providing these embodiments is makes the disclosure of the present invention more thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more phases
Any and all combinations of the listed item of pass.
Although thermal shock resistance is poor currently, cable termination insulator also has composite diphase material addition to form, it is easy
Stress occurs under the violent temperature difference and concentrates release, visible crack is burst or generated so as to cause insulator, influences the stabilization of electric system
Operation.
Thermal shock resistance is also known as thermal shock resistance, refers to the ability of material bearing temperature great change, it is material mechanical performance
Combined reaction with thermal property to heating condition.The thermal shock resistance of ceramic material depends on the thermal stress of material internal, and
The size of thermal stress depends on the influence of the factors such as its mechanical property and thermal property, so the thermal shock resistance of ceramic material must
It will be the general performance of its mechanical property, thermal property corresponding to various heating conditions.The thermal shock destruction of ceramic material can be divided into
Instantaneous break under high wind-warm syndrome and the cracking under heat shock cycling effect, peeling destroy two classes up to whole.In view of ceramics
The difference of material thermal shock failure mode, at present by there are two types of the generally accepted thermal shock evaluation theories of people: one is be based on thermoelastic
Property theoretical limit stress fracture theory, one is the Thermal-shock Damage based on fracture mechanics is theoretical.
Wherein, limit stress fracture theory is with thermal stress σHWith the inherent strength σ of materialfBetween balance as anti-thermal shock
The foundation of destruction, it is believed that the thermal stress caused by thermal shock in the material is more than the inherent strength of material, i.e. σH≥σfWhen, material heat
Shake fracture, anti-thermal shock fracture theory is using intensity --- stress is criterion, it is believed that the thermal stress in material reaches the tensile strength limit
Afterwards, material just generates cracking, once the complete destruction for thering is crack nucleation to will lead to material, the theory for general glass and
Ceramics can be applicable in, but the good thermal shock resistance of the material without method interpretation containing micropore.Thermal-shock Damage theory is with thermoelastic strain
Can criterion of the relationship as Thermal-shock Damage between W and energy to failure U, crack nucleation of analysis of material under the conditions of temperature change,
Extension and the dynamic process inhibited.When the strain energy W stored in material is more than energy U, i.e. W >=U required for the fracture of material
When, crackle just starts generation, extends the Thermal-shock Damage so as to cause material.
Therefore, the application is in α-Al2O3It is middle to introduce the high metal molybdenum of thermal conductivity to improve the heat shock resistance of ceramic insulator
Property.Since metal is conductor, the insulation performance of ceramic insulator can be reduced, so that it is made not to be able to satisfy the requirement of insulation performance,
So the application coats metal molybdenum powder using hexagonal boron nitride, so that the metal molybdenum introduced is straight in the microscopic ranges of certain size
It connects forfeiture electric conductivity, and hexagonal boron nitride also has that heat conductivity is good, the preferable characteristic of thermal shock resistance, and passes through each original
The conditions such as the dosage collocation of material component and subsequent compacting sintering technique, mention the thermal shock resistance of ceramic material obviously
Height, and while improving its thermal shock resistance, make it have good other physical properties, such as mechanical strength.
The following are some embodiments:
α-Al2O3Powder can be bought by commercially available, can also be obtained by self-control.
Embodiment 1
The preparation method of cable termination insulator, detailed process is as follows:
1) using high-purity technical aluminium oxide (purity is greater than 99.5%), partial size is 1 μm~5 μm, 1600 under air atmosphere
DEG C calcining 12h, so that it is sufficiently changed into α-Al2O3, then by gained α-Al2O3Powder is fully ground.
2) after being fully ground the metal Mo powder that partial size is 20nm~130nm, according to Mo powder and (NH2)2CO、H3BO3Rub
You are than being 1:38:19, by the Mo powder and urea ((NH after grinding2)2) and boric acid (H CO3BO3) mixing, dehydrated alcohol is added and fits
Ball milling 48 hours in the ball mill after deionized water are measured, the solvent evaporated on a rotary evaporator after ultrasonic wave is fully dispersed, then
It is 12 hours dry to be placed in 100 DEG C of vacuum drying ovens, obtains dry mixture.
3) the resulting mixture of step 2) is heated to 600 DEG C of calcinings 20~25 in air with 2 DEG C/min heating rate
Hour, then in N2It is calcined 8 hours in atmosphere in 950 DEG C, obtains a nanometer h-BN cladding Mo composite powder.To resulting nanometer h-
BN cladding Mo composite powder is detected, and the partial size that the weight of h-BN accounts for 67.2%, h-BN of the weight of composite powder is 20nm
~50nm.
4) nanometer h-BN is coated into Mo composite powder and α-Al2O3Powder mixing, obtains mixed-powder, wherein α-Al2O3Powder
85wt% is accounted for, nanometer h-BN cladding Mo composite powder accounts for 15%.
5) according to Y2O3Additive amount be that nanometer h-BN coats Mo composite powder and α-Al2O3The 5% of powder total weight, will be upper
State the mixed-powder and Y that step 4) obtains2O3It mixes and is fully ground, wherein yttrium oxide is that analysis is pure；Then by the original after grinding
Material, which is placed in dehydrated alcohol, to be stirred, and disperses 30min with ultrasonic wave；Be placed on ball milling 36 hours in ball mill, then be placed in rotation
Turn 100 DEG C of solvent evaporateds in evaporimeter, then is placed in 100 DEG C of constant temperature ovens and dries 12 hours；100min, 360 mesh are ground later
Be sieved mixed ceramic powder, then using spray drying process that ceramic powder is dry.
6) by dry ceramic powder under the conditions of 230MPa~250MPa through cold isostatic compaction, obtain cable termination porcelain
Cover green body.
7) it is sintered 12 hours in 1750 DEG C of flowing hydrogen atmosphere, cooled to room temperature obtains cable termination insulator
Sample.
Production is not less than three samples according to the above method, and detects to the performance of sample:
The averag density of cable termination insulator sample is 4.01g/cm3；Using line-of-sight course, four-way bend test, cable are done
The average bending strength (room temperature) of terminal insulator sample is 390MPa；Temperature cycling test uses the side of heating chilling but
Method 10 times repeatedly, then obtains its thermal shock resistance by measuring remaining bending strength, finally obtains and is in the anti-thermal shock temperature difference
At 750 DEG C, bending strength loss late is 5%.
Embodiment 2
Embodiment 2 is substantially the same manner as Example 1, the difference is that: nanometer h-BN is coated Mo composite powder by step 4)
With α-Al2O3Powder mixing, obtains mixed-powder, wherein α-Al2O3Powder accounts for 89.5wt%, and nanometer h-BN cladding Mo composite powder accounts for
10.5%.
The sample of gained cable termination insulator is detected:
The averag density of cable termination insulator sample is 3.98g/cm3；Using line-of-sight course, four-way bend test, cable are done
The average bending strength (room temperature) of terminal insulator sample is 395MPa；Temperature cycling test uses the side of heating chilling but
Method 10 times repeatedly, then obtains its thermal shock resistance by measuring remaining bending strength, finally obtains and is in the anti-thermal shock temperature difference
At 723 DEG C, bending strength loss late is 5%.
Embodiment 3
Embodiment 3 is substantially the same manner as Example 1, the difference is that: nanometer h-BN is coated Mo composite powder by step 4)
With α-Al2O3Powder mixing, obtains mixed-powder, wherein α-Al2O3Powder accounts for 83.5wt%, and nanometer h-BN cladding Mo composite powder accounts for
16.5%.
The sample of gained cable termination insulator is detected:
The averag density of cable termination insulator sample is 4.02g/cm3；Using line-of-sight course, four-way bend test, cable are done
The average bending strength (room temperature) of terminal insulator sample is 380MPa；Temperature cycling test uses the side of heating chilling but
Method 10 times repeatedly, then obtains its thermal shock resistance by measuring remaining bending strength, finally obtains and is in the anti-thermal shock temperature difference
At 762 DEG C, bending strength loss late is 5%.
Embodiment 4
Embodiment 4 is substantially the same manner as Example 1, the difference is that: nanometer h-BN is coated Mo composite powder by step 4)
With α-Al2O3Powder mixing, obtains mixed-powder, wherein α-Al2O3Powder accounts for 90wt%, and nanometer h-BN cladding Mo composite powder accounts for
7.5%.
The sample of gained cable termination insulator is detected:
The averag density of cable termination insulator sample is 3.95g/cm3；Using line-of-sight course, four-way bend test, cable are done
The average bending strength (room temperature) of terminal insulator sample is 385MPa；Temperature cycling test uses the side of heating chilling but
Method 10 times repeatedly, then obtains its thermal shock resistance by measuring remaining bending strength, finally obtains and is in the anti-thermal shock temperature difference
At 705 DEG C, bending strength loss late is 5%.
Embodiment 5
Embodiment 5 is substantially the same manner as Example 1, the difference is that: nanometer h-BN is coated Mo composite powder by step 4)
With α-Al2O3Powder mixing, obtains mixed-powder, wherein α-Al2O3Powder accounts for 77.5wt%, and nanometer h-BN cladding Mo composite powder accounts for
22.5%.
The sample of gained cable termination insulator is detected:
The averag density of cable termination insulator sample is 4.00g/cm3；Using line-of-sight course, four-way bend test, cable are done
The average bending strength (room temperature) of terminal insulator sample is 350MPa；Temperature cycling test uses the side of heating chilling but
Method 10 times repeatedly, then obtains its thermal shock resistance by measuring remaining bending strength, finally obtains and is in the anti-thermal shock temperature difference
At 770 DEG C, bending strength loss late is 5%.
Comparative example 1
Embodiment 1 is substantially the same manner as Example 1, the difference is that: nanometer h-BN is coated Mo composite powder by step 4)
With α-Al2O3Powder mixing, obtains mixed-powder, wherein α-Al2O3Powder accounts for 95wt%, and nanometer h-BN cladding Mo composite powder accounts for
5wt%.
The sample of gained cable termination insulator is detected:
The averag density of cable termination insulator sample is 4.02g/cm3；Using line-of-sight course, four-way bend test, cable are done
The average bending strength (room temperature) of terminal insulator sample is 424MPa；Temperature cycling test uses the side of heating chilling but
Method 8 times repeatedly, then obtains its thermal shock resistance by measuring remaining bending strength, finally obtains and is in the anti-thermal shock temperature difference
At 280 DEG C, bending strength loss late is 5%.
Comparative example 2
Comparative example 2 is substantially the same manner as Example 1, the difference is that: nanometer h-BN is coated Mo composite powder by step 4)
With α-Al2O3Powder mixing, obtains mixed-powder, wherein α-Al2O3Powder accounts for 85wt%, and nanometer h-BN cladding Mo composite powder accounts for
25wt%.
The sample of gained cable termination insulator is detected:
The averag density of cable termination insulator sample is 3.96g/cm3；Using line-of-sight course, four-way bend test, cable are done
The average bending strength (room temperature) of terminal insulator sample is 450MPa；Temperature cycling test uses the side of heating chilling but
Method 8 times repeatedly, then obtains its thermal shock resistance by measuring remaining bending strength, finally obtains and is in the anti-thermal shock temperature difference
At 270 DEG C, bending strength loss late is 5%.
(bending strength is for cable termination insulator and cable termination insulator on open market in the embodiment of the present invention 1~5
150Mpa~200Mpa, the anti-thermal shock temperature difference are generally below 200 DEG C) and the cable termination insulator of comparative example 1~2 compare, have
More preferably bending strength and the anti-thermal shock temperature difference.Further, Mo composite powder is coated in the feed by changing nanometer h-BN above
Mass percent Examples 1 to 5 and comparative example 1~2 it is found that making the matter of nanometer h-BN cladding Mo composite powder in the feed
Amount percentage changes in 7.5%~22.5% range, and the mechanical strength and thermal shock resistance of gained cable termination insulator are equal
Preferably, and nanometer h-BN cladding Mo composite powder mass fraction be 10.5%~16.5% when, comprehensively consider mechanical strength with
In the case where thermal shock resistance, resulting porcelain shell for cable terminal capabilities is best.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of complex phase ceramic insulating part, which is characterized in that the raw material for preparing the complex phase ceramic insulating part includes α phase oxidation
Aluminium, yttrium oxide and hexagonal boron nitride coat molybdenum composite powder, and the weight of the hexagonal boron nitride cladding molybdenum composite powder accounts for the α
Phase alumina and the hexagonal boron nitride coat the 7.5%~22.5% of the sum of weight of molybdenum composite powder, the yttrium oxide
Weight is that the alpha-phase aluminum oxide and the hexagonal boron nitride coat the 3%~8% of the sum of weight of molybdenum composite powder.
2. complex phase ceramic insulating part according to claim 1, which is characterized in that the hexagonal boron nitride coats molybdenum composite powder
The weight at end accounts for the 10%~18% of the sum of the alpha-phase aluminum oxide and hexagonal boron nitride cladding molybdenum composite powder weight.
3. complex phase ceramic insulating part according to claim 1, which is characterized in that the hexagonal boron nitride coats molybdenum composite powder
The weight ratio of hexagonal boron nitride and molybdenum in end is (1.8~2.2): 1.
4. complex phase ceramic insulating part according to claim 1, which is characterized in that the hexagonal boron nitride coats molybdenum composite powder
The partial size at end is 50nm~200nm.
5. a kind of preparation method of complex phase ceramic insulating part, which comprises the following steps:
Ceramic powder is provided, the ceramic powder includes alpha-phase aluminum oxide, hexagonal boron nitride cladding molybdenum composite powder and yttrium oxide,
The weight of the hexagonal boron nitride cladding molybdenum composite powder accounts for the alpha-phase aluminum oxide and hexagonal boron nitride cladding molybdenum composite powder
The 7.5%~22.5% of the sum of the weight at end, the weight of the yttrium oxide are the alpha-phase aluminum oxide and the hexagonal boron nitride packet
Cover the 3%~8% of the sum of weight of molybdenum composite powder；
The ceramic powder is pressed into ceramic insulator green body；
The ceramic insulator green body is sintered 5~12 hours under the conditions of atmosphere of hydrogen, 1650 DEG C~1800 DEG C of temperature, is obtained
The complex phase ceramic insulating part.
6. the preparation method of complex phase ceramic insulating part according to claim 5, which is characterized in that further include preparing described six
The step of square boron nitride cladding molybdenum composite powder:
Molybdenum powder is mixed with boric acid and urea, using ethyl alcohol as medium ball milling 24~50 hours, ultrasonic disperse, removal ethyl alcohol and drying
Afterwards, mixture is obtained；
By the mixture in air or hydrogen, after 500 DEG C~700 DEG C progress first time calcinings, in nitrogen atmosphere in
800 DEG C~1000 DEG C carry out second and calcine.
7. the preparation method of complex phase ceramic insulating part according to claim 5, which is characterized in that the preparation method is also wrapped
Include the preparation step of the alpha-phase aluminum oxide:
By alumina powder under air atmosphere, is calcined 10~15 hours in 1500 DEG C~1650 DEG C, obtain the alpha-phase aluminum oxide.
8. the preparation method of complex phase ceramic insulating part according to claim 5, which is characterized in that the preparation method is also wrapped
Include the step of preparing the ceramic powder:
The each component of the ceramic powder and ethyl alcohol are mixed, after ultrasonic disperse, ball milling 24~48 hours, then remove ethyl alcohol,
After grinding 60~120 minutes, sieving, spray drying.
9. the preparation method of complex phase ceramic insulating part according to claim 8, which is characterized in that the step of sieving is controlled
The partial size of the ceramic powder is made less than 360 mesh.
10. according to the preparation method of any complex phase ceramic insulating part of claim 5~9, which is characterized in that described by institute
State the step of ceramic powder is pressed into ceramic insulator green body are as follows: pass through the ceramic powder under the conditions of 230MPa~250MPa
Cold isostatic compaction obtains the ceramic insulator green body.
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