CN101173167A - Method for producing thermochromism variable emissivity lanthanum manganic acid material - Google Patents
Method for producing thermochromism variable emissivity lanthanum manganic acid material Download PDFInfo
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- CN101173167A CN101173167A CNA2007101333952A CN200710133395A CN101173167A CN 101173167 A CN101173167 A CN 101173167A CN A2007101333952 A CNA2007101333952 A CN A2007101333952A CN 200710133395 A CN200710133395 A CN 200710133395A CN 101173167 A CN101173167 A CN 101173167A
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Abstract
The invention discloses a preparation method of thermochromism lanthanum manganese oxide material with variable emissivity. The technical proposal of the invention is that, high purity oxides of quadrivalence Mn, oxides of trivalent La, and the reaction materials of strontium salt and calcium salt are weighted according to various chemistry molar ratios; lanthanum oxide is presintered before weighting; the raw powders are fully ball mill mixed; the mixed powder mixture is screened by a sieve with the mesh number ranging from 50 to 100, and high pressure press molding is performed to the powder; the pressed massive solid sinter experiences solid state reaction, with the reaction temperature ranges from 1200 DEG C to 1500 DEG C, and the time ranges from 6 to 20 hours; the solid product after the primary solid state reaction is processed again according to the previous steps, beginning from the grinding, and then the final product is acquired. The invention has the advantages that: the reaction is performed under the conditions of high temperature and high pressure, and the reaction that cannot be performed under normal temperature and pressure can be realized; the product is a massive solid having very high intensity, which facilitates machining; the emittance of the product can be conveniently measured; the Curie temperature of the material approximates to the ambient temperature, and the emissivity can have relatively large variation around the ambient temperature.
Description
One technical field
The invention belongs to the preparation method of a kind of technology of preparing of thermochromic material, particularly a kind of thermochromism variable emissivity lanthanum manganic acid material.
Two background technologies
The lanthanum manganate of doping strontium and calcium is the oxide material of manganese with thermochromism variable emissivity of perovskite structure.Generally speaking, rare earth manganese oxide have huge magneto-resistor, electric charge in order, be separated and big physical propertys such as magnetic entropy change, can be applicable to the magnetic sensory field, magnetic recording, fields such as magnetic refrigeration.Because rare earth manganese oxide is with a wide range of applications, current research shows, the lanthanum manganate of doping strontium and calcium has the characteristic of thermochromism and property of transition mutually, and exhibit metallic when temperature is lower than phase transition temperature has lower emittance; And when being higher than phase transition temperature, show isolator, and higher emittance is arranged, therefore can be used for making the variable emissivity material, and the preparation research of the lanthanum manganate material of doping strontium and calcium gets more and more people's extensive concerning more and more also.
At present, the main method of preparation lanthanum manganate material has solid reaction process, sol-gel method, floating zone melting etc. both at home and abroad, and prepared lanthanum manganate material by different methods with different Curie temperature, but mainly be the research at the magnetic aspect, the field of application is also relevant with magnetic, as the magnetic sensory field, magnetic recording, magnetic refrigeration etc., so that products therefrom mostly is is Powdered, and Curie temperature is not also in room temperature.Wherein, (Feng Shangshen prepares La with sol-gel method to documents 1
1-xCa
xMnO
3The huge magneto-resistance effect of (x=0.2,0.4) film, science and technology circular, 2000) prepared the La of Curie temperature with sol-gel method at 200K～250K
1-xCa
xMnO
3Material, its Curie temperature is far below room temperature, and intensity is lower; Documents 2 (Wu Jian, (La
1-xTb
x)
2/3Sr
1/3MnO
3The giant magnetoresistance effect of film, magnetisable material and device, 2001) with the material of solid state reaction sintering process preparation as target, adopt pulsed laser deposition to prepare the (La of Curie temperature at 324K～384K
1-xTb
x)
2/3Sr
1/3MnO
3Material, its Curie temperature is higher than room temperature, and cost of manufacture is higher, and the material that above-mentioned two kinds of methods are produced can not satisfy the requirement that is applied to mini-satellite thermal control field all at the application in magnetic field.
Three summary of the invention
The object of the present invention is to provide a kind of preparation method that can satisfy Curie temperature at the thermochromism variable emissivity lanthanum manganic acid material of room temperature, the doping strontium that higher-strength is arranged and calcium.
Thermochromism variable emissivity lanthanum manganic acid material is the oxide material with manganese of perovskite structure, and its chemical formula is La
1-xA
xMnO
3(A is Ca or Sr) and La
1-x-yA
xB
yMnO
3(A=Ca; B=Sr), wherein, 0＜x＜0.3,0＜y＜0.3.
The technical scheme that realizes the object of the invention is: a kind of preparation method of thermochromism variable emissivity lanthanum manganic acid material the steps include:
1 according to La
1-xA
xMnO
3(A=Ca or Sr) and La
1-x-yA
xB
yMnO
3(A=Ca; B=Sr) different chemical mol ratio takes by weighing the reaction raw materials of oxide compound, strontium salt and calcium salt of oxide compound, the trivalent lanthanum of high-purity tetravalence manganese, before the weighing with the pre-burning of lanthanum trioxide high temperature, wherein, 0＜x＜0.3,0＜y＜0.3;
2 with the abundant ball milling mixing of raw material powder;
The sieve sieve of 3 usefulness, 50～100 order numbers is got mixed powder stock, and with the compression moulding of powder high pressure;
4 pairs of blocks of solid sintering that suppress make it carry out solid state reaction, and the temperature of solid state reaction is 1200 ℃～1500 ℃, 6～20 hours reaction times;
Solid product after the 5 pairs of first solid state reactions is handled once according to aforesaid step 2-4 again, obtains final product.
The present invention compared with prior art, its remarkable advantage is: (1) reaction be under high-temperature and high-pressure conditions, to carry out, can realize the reaction that can not carry out at normal temperatures and pressures; (2) product is convenient to mechanical workout for having very high-intensity blocks of solid, can measure its emittance easily; (3) the material Curie temperature is near room temperature, and emittance can have greatly changed near room temperature.
Four description of drawings
Accompanying drawing is a thermochromism variable emissivity lanthanum manganic acid material preparation method's of the present invention schema.
Five embodiments
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment 1
La
0.75Ca
0.1Sr
0.15MnO
3The preparation of bulk sample
1, according to the mol ratio of metallics in the molecular formula, accurately takes by weighing La
2O
336.6330 gram, SrCO
36.6394 gram, CaCO
33.0153 gram and MnO226.0702 gram.Because lanthanum trioxide is easy deliquescence in air, before weighing, burn 4 hours down to remove CO at 1000 ℃
2And crystal water;
2, the rotating speed ball milling of it all being poured in the ball mill with 300～500r/min mixed 2～4 hours;
3, the powder that mixing is obtained is crossed 100 purposes sieve, briquetting under the static pressure of 180Mpa then;
4, bulk sample is put into High Temperature Furnaces Heating Apparatus, carry out presintering as follows: initial temperature to 1000 ℃～1200 ℃, and is incubated 6～10 hours through life in 2～4 hours under this temperature; Be warmed up at last 1350 ℃ the insulation 15～20 hours after naturally cooling obtain black powder;
5, repeated for the second, three step;
6, the bulk sample that presses is put into High Temperature Furnaces Heating Apparatus, final as follows sintering: initial temperature was raised to 1000 ℃～1200 ℃ through 2～4 hours, and under this temperature, be incubated 6～10 hours, be warmed up to 1350 ℃ of insulations at last and obtain product behind the naturally cooling after 6～10 hours.The phase transition temperature point that records through vibrating sample magnetometer (VSM) is 293K.
Embodiment 2
La
0.825Sr
0.175MnO
3The preparation of bulk sample
1, according to the mol ratio of metallics in the molecular formula, accurately takes by weighing La
2O
326.0169 gram, SrCO
35.002 gram and MnO
216.7290 gram.Because lanthanum trioxide is easy deliquescence in air, before weighing, burn 4 hours down to remove CO at 1000 ℃
2And crystal water;
2, the rotating speed ball milling of it all being poured in the ball mill with 300～500r/min mixed 2～4 hours;
3, the powder that mixing is obtained is crossed 50 purposes sieve, briquetting under the static pressure of 150Mpa then;
4, bulk sample is put into High Temperature Furnaces Heating Apparatus, carry out presintering as follows: initial temperature to 1000 ℃～1200 ℃, and is incubated 6～10 hours through life in 2～4 hours under this temperature; Be warmed up at last 1450 ℃ the insulation 4～8 hours after naturally cooling obtain black powder;
5, repeated for the second, three step;
6, the bulk sample that presses is put into High Temperature Furnaces Heating Apparatus, final as follows sintering: initial temperature was raised to 1000 ℃～1200 ℃ through 2～4 hours, and was incubated 6～10 hours under this temperature; Be warmed up to 1350 ℃ of insulations at last and obtain product behind the naturally cooling after 6～10 hours.The phase transition temperature point that records through vibrating sample magnetometer (VSM) is 283K.
Claims (4)
1. the preparation method of a thermochromism variable emissivity lanthanum manganic acid material is characterized in that may further comprise the steps:
1.1 according to La
1-xA
xMnO
3(A=Ca or Sr) and La
1-x-yA
xB
yMnO
3(A=Ca; B=Sr) different chemical mol ratio takes by weighing the reaction raw materials of oxide compound, strontium salt and calcium salt of oxide compound, the trivalent lanthanum of high-purity tetravalence manganese, before the weighing with the pre-burning of lanthanum trioxide high temperature, wherein, 0＜x＜0.3,0＜y＜0.3;
1.2 the abundant ball milling of raw material powder is mixed;
1.3 the sieve sieve with 50～100 order numbers is got mixed powder stock, and with the compression moulding of powder high pressure;
1.4 to the blocks of solid sintering that suppresses, make it carry out solid state reaction, the temperature of solid state reaction is 1200 ℃～1500 ℃, 6～20 hours reaction times;
1.5 to the solid product after the first solid state reaction, handle once again from pulverizing beginning, obtain final product according to aforesaid step 2-4.
2. the preparation method of thermochromism variable emissivity lanthanum manganic acid material according to claim 1, it is characterized in that: reaction raw materials is high-purity Strontium carbonate powder, lime carbonate.
3. the preparation method of thermochromism variable emissivity lanthanum manganic acid material according to claim 1 and 2 is characterized in that: before the weighing with lanthanum trioxide 1000 ℃ of following sintering 4 hours to remove CO2 and crystal water wherein.
4. the preparation method of thermochromism variable emissivity lanthanum manganic acid material according to claim 1 and 2 is characterized in that: powder compression moulding under the static pressure of 150～200Mpa.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101337818B (en) * | 2008-08-22 | 2011-01-19 | 西南交通大学 | Adhesive joint type perovskite manganese oxide material |
| CN102249009A (en) * | 2011-05-12 | 2011-11-23 | 南京理工大学 | Thermochromism emittance-variable thermal control device for spacecrafts |
| CN103529408A (en) * | 2013-10-22 | 2014-01-22 | 东北林业大学 | Method for testing magnetic cluster microscopic priming effect |
| JP2014508743A (en) * | 2011-01-31 | 2014-04-10 | 高麗大学校産学協力団 | Magnetic nanoparticles having Curie temperature within biocompatible temperature and method for producing the same |
| CN104975258A (en) * | 2015-03-28 | 2015-10-14 | 桐城市新丰彩印包装有限公司 | Preparing technology for color changing film |
-
2007
- 2007-10-19 CN CN200710133395A patent/CN100588701C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101337818B (en) * | 2008-08-22 | 2011-01-19 | 西南交通大学 | Adhesive joint type perovskite manganese oxide material |
| JP2014508743A (en) * | 2011-01-31 | 2014-04-10 | 高麗大学校産学協力団 | Magnetic nanoparticles having Curie temperature within biocompatible temperature and method for producing the same |
| EP2671570A4 (en) * | 2011-01-31 | 2015-05-27 | Univ Korea Res & Bus Found | Magnetic nanoparticle, having a curie temperature which is within biocompatible temperature range, and method for preparing same |
| CN102249009A (en) * | 2011-05-12 | 2011-11-23 | 南京理工大学 | Thermochromism emittance-variable thermal control device for spacecrafts |
| CN103529408A (en) * | 2013-10-22 | 2014-01-22 | 东北林业大学 | Method for testing magnetic cluster microscopic priming effect |
| CN103529408B (en) * | 2013-10-22 | 2015-11-18 | 东北林业大学 | Test magnetic clusters microcosmic inspires the method for effect |
| CN104975258A (en) * | 2015-03-28 | 2015-10-14 | 桐城市新丰彩印包装有限公司 | Preparing technology for color changing film |
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| Publication number | Publication date |
|---|---|
| CN100588701C (en) | 2010-02-10 |
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