49 results about "Platinum crucible" patented technology

The invention belongs to the field of single crystal growth, and particularly relates to a novel single crystal with ferroelectricity and ferromagnetic orderliness at room temperature and a growth method. Comprising the following steps: grinding a composition 1 and a composition 2 in an aluminum oxide mortar, putting into a platinum crucible, putting the platinum crucible into an aluminum oxide crucible, putting the aluminum oxide crucible into a single crystal growth furnace, adjusting a temperature program, cooling to room temperature, and taking out the platinum crucible; and S2, putting the platinum crucible taken out in the step S1 into a beaker, adding dilute nitric acid, and carrying out ultrasonic cleaning to obtain the novel ordered single crystal with ferroelectricity and ferromagnetic at room temperature. The high-temperature melting method is adopted for the first time to grow the novel single crystal with ferroelectricity and ferromagnetic ordered state at the same time under the room temperature condition, and the operation method is simple and easy to implement.

The invention belongs to the technical field of quantum dot glass ceramics, and relates to high-modulus multiphase quantum dot glass ceramics as well as a preparation method and application thereof. The microcrystalline glass comprises eucryptite (LiAlSiO4), lithium aluminate (LiAlO2) and quantum dots (CsPbBr3), wherein the eucryptite (LiAlSiO4) and the lithium aluminate (LiAlO2) are main crystalline phases. The surface of the LiAlO2 crystal phase is coated with the LiAlSiO4 crystal phase or gaps of the LiAlO2 crystal phase are filled with the LiAlSiO4 crystal phase to form a multi-phase reinforced structure, and the CsPbBr3 quantum dot glass ceramic has excellent water stability and deformation resistance. The preparation method comprises the following steps: respectively preparing a basic glass batch and a CsPbBr3 quantum dot precursor, and carrying out melting, water quenching and grinding on the glass batch to obtain basic glass powder; the preparation method comprises the following steps: placing a quantum dot precursor at the bottom of a platinum crucible by adopting a layered loading process, then covering basic glass powder, and finally obtaining the quantum dot microcrystalline glass through melting homogenization, casting molding and controlled heat treatment. The method is simple in process and high in controllability; the obtained product is excellent in comprehensive performance and good in application prospect.

The utility model provides a platinum crucible polishing device which comprises a drilling machine, the output end of the drilling machine is connected with a polishing head, the periphery of the polishing head is coated with a wool layer, and the wool layer is coated with a silicon dioxide nanofiber membrane. A circle of polishing bristles used for polishing the corners of the bottom face and the side face of the platinum crucible are arranged at the corner connecting position of the side face and the bottom face of the polishing head. Silicon dioxide is a common grinding aid, and can effectively remove an oxide layer, dirt and tiny flaws on the surface of the platinum crucible, so that the surface of the crucible is smoother; the wool has a soft fiber structure, can adapt to the curved surface and fine concave-convex parts of the crucible, and can be used for uniformly polishing the surface of the whole crucible, so that the polishing effect is ensured to be consistent; the fiber structure of the wool is very fine and smooth, so that obvious scratches or traces cannot be left on the surface of the platinum crucible; the wool fiber is soft and mild, does not cause excessive heat or friction, and does not damage or destroy the platinum crucible, so that the integrity of the crucible is protected.

The invention relates to the technical field of beta-Ga2O3 crystal material growth, in particular to a fluxing agent of a beta-Ga2O3 crystal and a preparation method of a single crystal X-ray detector of the fluxing agent. A fluxing agent for growing the beta-Ga2O3 crystal comprises tellurium oxide and divalent alkaline earth metal carbonate. Uniformly mixing gallium oxide and a fluxing agent to obtain a mixed material; transferring the mixed material into a crystal growth furnace, and heating to melt the mixed material to obtain a melt; and cooling the melt to 0.5-3 DEG C above the saturation point temperature, putting a seed crystal into the melt, cooling to enable the crystal to grow, taking out the crystal after the growth is finished, and cooling to room temperature to obtain the beta-Ga2O3 crystal. The fluxing agent provided by the invention does not contain toxic components such as lead, fluorine and the like, the crystal growth temperature range of the fluxing agent is approximately 780-850 DEG C, the growth temperature of the crystal is effectively reduced, the volatilization of a melt at a high temperature is reduced, the deviation and viscosity of solution components are reduced, the corrosion to a platinum crucible is reduced, and the beta-Ga2O3 crystal with high quality and large size is easy to obtain.

The utility model discloses a moving and overturning device for a glass experiment. The moving and overturning device comprises a moving carrier, an overturning platform, a limiting plate and a clamp, the movable carrier is installed on the limiting plate, the overturning platform is rotatably installed on the movable carrier through a rotating shaft, a bottom plate is arranged at the bottom of the overturning platform, a bottom face heat insulation plate is arranged on the bottom plate, a first vertical plate is arranged on one side of the overturning platform, second vertical plates are connected to the two sides of the first vertical plate, and a first vertical face heat insulation plate is arranged on one side of the first vertical plate. A second vertical face heat insulation plate is arranged on one side of the second vertical plate, the first vertical plate and the second vertical plate form a U-shaped frame, and one end of the clamp is supported on the movable carrier. According to the utility model, the platinum crucible and the lining thereof can be quickly moved out of the heating furnace platform through the moving and turning device, and molten materials are quickly poured into a preset sample preparation mold by using the turning platform, so that the success rate of sample preparation of the large-capacity platinum crucible is improved, and the safety risk in the process is reduced.

The invention provides a preparation method of a rare earth ion doped yttrium ferrite single crystal. The preparation method comprises the following steps: weighing Re2O3, Fe2O3 and Y2O3 according to the stoichiometric ratio of each element shown in the chemical formula; wherein Fe2O3 is excessive by 5-8% so as to compensate defects caused by volatilization of iron ions; nb2O5 is doped to compensate radius mismatch caused by doping of rare earth ions, and the doping range of Nb2O5 is 1-5% of the content of Re2O3. Then mixing a fluxing agent KCl-LiCl-B2O3 according to a molar ratio of (35 to 42): (35 to 42): (16 to 30) to form a mixed raw material; putting the mixed raw material into a platinum crucible, and heating the inside of the platinum crucible to 1170-1200 DEG C; carrying out heat preservation on the interior of the platinum crucible; cooling the inside of the platinum crucible to 1050-1100 DEG C, and inserting the seed crystal into the platinum crucible; continuously cooling, and rotating the seed crystal; cooling the inside of the platinum crucible to 900-950 DEG C, and finishing crystal growth; and lifting the crystal away from the liquid surface for cooling and annealing to obtain the rare earth ion doped yttrium ferrite single crystal. According to the invention, doping uniformity control, centimeter-level crystal growth, impurity blocking and lattice stress elimination are realized.

The name of the utility model is a scratch-proof platinum crucible transportation device. Belongs to the technical field of optical glass platinum crucible transportation and placement. The device mainly solves the problems that the platinum crucible is easy to deform and scratch during installation and transportation and the structure of the platinum crucible is easy to damage during hoisting. The device is mainly characterized by comprising a support ring and a support ring support frame, the diameter of the support ring is smaller than the maximum diameter of the outer upper part of the platinum crucible; the space of the inner side of the supporting ring supporting frame is larger than the space occupied by the platinum crucible. According to the device, a platinum crucible is placed on the inner wall of the supporting ring, a platinum tube is fixed in the supporting clamping groove, therefore, the platinum crucible is prevented from being scratched and deformed due to shaking in the transportation and placement process, the transportation risk is reduced, it is guaranteed that the structure is not damaged, in addition, the supporting ring is sleeved with glass fiber cotton, and the situation that stainless steel is attached and rubbed with the platinum crucible due to high hardness is avoided. The device is mainly used for transporting and placing the platinum crucible.

The utility model discloses a pilot plant test furnace platinum crucible for glass ceramic production, which comprises a melting pot body, an omega-shaped expansion structure is arranged in the circumferential direction of the pot body, a split pot cover is arranged above the melting pot body, a discharge pipe is connected below the melting pot body, a grating filter screen with a V-shaped structure is arranged inside the melting pot body, a bubbling pipe is arranged on the split pot cover, and the bubbling pipe is connected with a nozzle. An electrode is arranged at the bottom of the discharging pipe; the problems of thermal stress deformation and fatigue cracking caused by alternate cooling and heating are effectively solved by arranging an omega-shaped expansion structure and a grid filter screen of a V-shaped structure on the periphery of the melting pot body, the problems that a traditional barrel-shaped platinum crucible is prone to thermal shock deformation and cracking and the like are solved, the blowing-out maintenance and shaping frequency is reduced, the service life is remarkably prolonged, and the production cost is reduced. And under the condition of the same volume, the usage amount of platinum is reduced by more than 20% compared with that of a traditional barrel-shaped platinum crucible, and the manufacturing cost of the platinum crucible is remarkably saved.

The invention provides a preparation method of a CeF3 doped M type barium ferrite single crystal. The preparation method comprises the following steps: S1, drying raw materials BaCO3, Fe2O3 and CeF3 and a fluxing agent LiF-NaF-B2O3; s2, raw materials BaCO3 and Fe2O3 are weighed, meanwhile, a proper amount of CeF3 powder is added, the raw materials and a fluxing agent LiF-NaF-B2O3 are mixed, and a mixed raw material is obtained; s3, putting the mixed raw material into a platinum crucible, sealing the platinum crucible, and filling protective gas; s4, the platinum crucible is heated, the temperature of the interior of the platinum crucible is increased to 1120-1200 DEG C, heat preservation is conducted, and the mixed raw materials are fully molten and homogenized; s5, cooling the interior of the platinum crucible to 990-1030 DEG C, lt; 001gt, 001gt; inserting the oriented seed crystal into a platinum crucible, and then cooling to 900-950 DEG C; s6, rotating the seed crystal, and meanwhile, adopting a lifting mode; and S7, annealing treatment is carried out, such that a complete single crystal is obtained. According to the invention, stable doping of Ce < 3 + > ions is realized, a pollution-free preparation process is adopted, large-size single crystals are prepared, and the performance of the prepared single crystals is optimized.

This application provides a manufacturing method of a platinum crucible for crystal growth, the manufacturing method comprising the following steps: melting platinum in a composite crucible and casting it into a platinum ingot; hot forging, rolling, first annealing, rough spinning, second annealing, fine spinning, and third annealing of the platinum ingot to produce the platinum crucible for crystal growth. In the platinum crucible manufactured by the manufacturing method of the present application, the surface of the platinum crucible is smooth, the structure is uniform, and the thickness is constant. The sheet is formed in one go, and the outer edge does not need to be welded. Product quality is significantly improved compared to traditional welding methods. By using a composite crucible to purify platinum during the melting process, the leakage rate of the platinum crucible during crystal growth is reduced.The platinum crucible can also be repeatedly melted and spun to produce a platinum crucible, so that platinum can be recycled.

The invention belongs to the technical field of artificial crystals, and particularly discloses a hollowing-free high-quality bismuth vanadate single crystal and a preparation method thereof. The preparation method comprises the following steps: mixing bismuth oxide and vanadium pentoxide to obtain a mixed raw material; then putting the mixed raw material into a platinum crucible, and heating for reaction to obtain bismuth vanadate; placing the obtained platinum crucible with bismuth vanadate in a pulling furnace, and preparing the hollowness-free high-quality bismuth vanadate single crystal by adopting a pulling method; the heating mode of the Czochralski method is medium-frequency induction heating. According to the invention, the heating mode is changed, so that the heat in the bismuth vanadate melt in the crucible can be quickly transferred and uniformly distributed, thereby keeping stable temperature distribution, realizing better thermal field stability, laying a foundation for preparing high-quality bismuth vanadate single crystals, and effectively preventing the generation of crystal hollowing. In addition, an iridium crucible is replaced by a platinum crucible, the pulling atmosphere does not need to be controlled, and low-cost preparation of the bismuth vanadate single crystal is facilitated.

The invention provides a preparation method of an M-type barium ferrite single crystal, which comprises the following steps: S1, weighing raw materials BaCO3 and Fe2O3, mixing the raw materials to obtain a primary mixture, and mixing the primary mixture with a fluxing agent LiF-NaF-B2O3 to obtain a mixed raw material, s2, the mixed raw materials are put into a platinum crucible, the temperature is increased to 1200-1270 DEG C, and then heat preservation is conducted; s3, the platinum crucible is cooled to 1100-1150 DEG C, and then a tilt part is inserted; 001gt, 001gt; an oriented seed crystal; s4, continuously cooling, and rotating the seed crystal; s5, after the platinum crucible is cooled to 970-1000 DEG C, crystal growth is finished; and S6, lifting the crystal away from the liquid level, and carrying out annealing treatment to obtain the M-type barium ferrite single crystal. The problems of small crystal size, toxic pollution and microwave performance degradation in the prior art are solved, and size bottleneck breakthrough, pollution-free process, component stability control and microwave performance optimization are realized.

The application relates to a free radical polymerization method of high-polymerization-degree high-temperature-resistant inorganic materials, and the technical scheme is as follows: iron oxide powder, aluminum oxide powder, silicon dioxide powder and calcium oxide powder are uniformly mixed according to the mass ratio of 0.1-4:1 to prepare oxide mixed powder; the oxide mixed powder is filled into a platinum gold crucible and heated to complete melting under a protective atmosphere; after being kept stable for 3-10 minutes under the protective atmosphere or an oxidation atmosphere, polymerization monomer powder is added into active oxide melt containing free radicals according to the mass ratio of 0.1-1:1, chain-type chain polymerization is carried out under the protective atmosphere for 5-30 minutes, the temperature is reduced to room temperature at a speed of 50-1000 DEG C / s, and high-polymerization-degree inorganic materials are obtained. The application has the advantages of simple preparation process, short cycle, high polymerization degree of the prepared high-temperature-resistant inorganic materials, excellent high-temperature service performance, and the like, and can significantly improve the strength and toughness of high-temperature ceramic materials.

This invention discloses a method for detecting the alumina content in aluminum-manganese-calcium alloys, mainly solving the technical problem that existing methods cannot accurately and rapidly detect the alumina content in aluminum-manganese-calcium alloys. The technical solution is as follows: a method for detecting the alumina content in aluminum-manganese-calcium alloys, comprising: 1) sample preparation: after removing the oxide layer on the sample surface, the sample is placed in a reagent bottle containing organic solvent for storage; 2) alumina extraction from the sample: first, alumina is extracted from the sample by electrolysis, the sample is placed in an electrolytic cell for electrolysis, the sample is the anode, a platinum electrode is the cathode, and a saturated calomel electrode is the reference electrode; 3) detection of alumina in the sample: the filter membrane and filter material from step 2) are placed in a platinum crucible, and the filter membrane is removed by high-temperature ashing; 4) calculation of the mass percentage of alumina in the aluminum-manganese-calcium alloy. The method of this invention for determining the alumina content in aluminum-manganese-calcium alloys has a relative standard deviation (RSD) of less than 3%, indicating good precision, accuracy, and reliability of the detection data.

The application discloses a sodium carbonate alkali fusion method for measuring multiple elements in soil or sediment, and comprises the following steps: selecting anhydrous sodium carbonate as a flux, placing the flux and a to-be-measured object into a platinum gold crucible, moving the platinum gold crucible into a muffle furnace to heat, taking out the platinum gold crucible to shake and shape, placing the platinum gold crucible into room-temperature tap water to cool, adding deionized water, heating and pyrolyzing, soaking for 24 hours, fully stirring with a plastic rod, washing with deionized water, adding 2ml of dilute hydrochloric acid, heating at low temperature, crushing the fallen substances, stirring and adding nitric acid-hydrochloric acid mixed acid, dissolving and transferring, constant volume and uniform shaking, and after filtration, the obtained solution can be directly used for measuring boron elements, and after dilution with an appropriate multiple, the solution can be used for detecting other elements.

FIELD: inorganic chemistry.SUBSTANCE: invention can be used in magnetic, optical, magneto-optical, X-ray and resonance studies, as well as in new generation synchrotron technologies. A charge is prepared comprising, by wt.%: (Fe2O3 + Ga2O3) 4.9; B2O3 58.3; PbO 25.0; PbF2 11.8. The prepared charge is melted in small portions into a platinum crucible at 870 °C, which is then placed in the gradient-free zone of the growth furnace and heated for melting to 900 °C for 4 hours. A platinum crystal holder is lowered into the resulting melt solution, rotating it at a speed of 20-60 rpm, and homogenized at this temperature, holding for 20-24 hours. After this, temperature surges are carried out cyclically, consisting of rapid cooling with holding and heating with holding. During the first and second cycles of temperature surges, the temperature is sharply reduced to 800-820 °C for 20 minutes and maintain at this temperature for 2-4 hours, then heat to 900 °C for 20 minutes and maintained at this temperature for 4-12 hours. In the third cycle, the temperature is sharply reduced to 800-810 °C for 20 minutes and kept at this temperature for 2-3 hours, then heated to 830-835 °C in 20 minutes and maintained at this temperature for 3-4 hours. After the specified temperature changes, the temperature is sharply reduced in 15 minutes to 805-810 °C and isothermal holding is carried out for 0.5-1 hour, during which the rotation of the crystal holder is turned off. Then smooth cooling is carried out at a rate of 0.1-0.3 °C / h up to 780 °C, the synthesized crystals are released from the crucible by smoothly removing the crystal holder from it at a speed of 0.5 cm / min. Final cooling of the furnace is carried out for 4-6 hours to a temperature of 500 °C with subsequent shutdown. The invention makes it possible to grow single crystals of Fe1-xGaxBO3, where 0≤x<0.2, in the form of plates up to 5 mm in diameter.EFFECT: improved performance.1 cl, 2 dwg, 3 ex

The invention discloses a high-strength intermediate infrared wave-transparent calcium-aluminum ceramic, which is characterized in that the main crystalline phases are CaAl2O4 and Ca12Al14O33, and the grain size is 30-150 nm; meanwhile, a small amount of CaZr4O9 crystal phase and an amorphous phase rich in SiO2 are also contained; the preparation method comprises the following steps: fully mixing the raw materials according to the proportion, and melting in a platinum crucible at the temperature of not lower than 1450 DEG C; pouring molten glass into a forming mold for cooling after melting is finished, then transferring the molten glass into a muffle furnace for annealing, and cooling the molten glass to room temperature along with the furnace after annealing is finished, so as to obtain precursor glass; carrying out heat treatment by adopting a one-step method, adding the obtained precursor glass into a heat treatment furnace, heating to 900-1100 DEG C at the speed of not more than 10 DEG C / min, and carrying out heat treatment for not less than t (mm) / (0.15 mm / h); through component design and a preparation process, under the condition that certain visible light transmittance is guaranteed, the intermediate infrared wave-transparent band of the calcium-aluminum ceramic is effectively expanded, the transmittance of the intermediate infrared wave band is remarkably improved, and meanwhile the hardness and the elastic modulus are improved.

The present application relates to a kind of preparation methods of amber glass, it is characterized in that: (1) composite colorant is prepared according to the following mole percentage: 0.06-0.07% Fe2O3, 0.01-0.05% iron silicate, 0.23-0.62% Na2SO4, 0.01-0.24% NH4HSO4, 0.25-2.6% high-purity graphite powder, the rest is anhydrous ethanol;(2) after the batch is placed into oven and dried, it is filled into platinum crucible and is melted, 1450-1520 ℃ is kept for 0.5-1.5 h;(3) copper plate of glass casting is preheated, and the glass liquid that is melted and clarified is taken out from high-temperature furnace, and is cast on the copper plate that is preheated;(4) the glass that is cast is placed into annealing furnace, then with furnace cooling to room temperature, and amber glass is prepared.The present application has the following advantages: the composite colorant of the present application can strictly control Fe 2+ / Fe 3+ As 1.76-2.25, can greatly improve the uniformity of coloring, stability;The visible light transmittance of the glass of the present application is ≤35%, 10-300 nm transmittance is 0, greatly improve the performance of ultraviolet resistance;Viscosity is lower during melting process, beneficial to glass packaging vessel forming.

The utility model discloses a platinum crucible trimming tool, which belongs to the technical field of platinum crucible trimming, and comprises a mold table and a platinum crucible, the platinum crucible is arranged at the top of the mold table, a fixing component is arranged at the bottom of the mold table, a trimming component is arranged at the top of the platinum crucible, the trimming component comprises a trimming mold, and the trimming mold is arranged on the mold table. A connecting block is fixedly connected to the side wall of the trimming die, a first magnetic block is fixedly connected to the interior of the connecting block, and a positioning block is fixedly connected to the bottom surface of the trimming die; according to the device, the finishing assembly and the mold table are arranged, through the design, the mold table and the finishing mold are used for assisting the platinum crucible in deformation recovery, and the problem that in the prior art, knocking shaping is conducted through pliers or a wooden stick, and the efficiency is low is solved; and the stability of the trimming die in knocking is improved, and deviation is prevented.

The invention discloses a method for simultaneously measuring contents of various elements in steelmaking molten cooling slag, and relates to the technical field of element analysis of the steelmaking molten cooling slag. According to the method, on the basis of the characteristics of the steelmaking molten cooling slag, smashing and burning oxidation treatment are conducted in a targeted mode, so that elemental metal can be oxidized, later-stage melting treatment is facilitated, the detection accuracy is improved, sulfur elements can be removed, corrosion to a platinum crucible in the melting process is avoided, and the detection cost is reduced; meanwhile, through the principle that sodium carbonate or potassium carbonate destroys oxides in the molten and cooled slag at high temperature and can dissolve out target elements in the molten and cooled slag, multiple target elements can be analyzed at the same time, the target elements are not lost, and therefore the detection efficiency and the detection accuracy are remarkably improved; the method is convenient to operate, high in detection efficiency, good in detection result accuracy and suitable for large-scale popularization and application in component detection of the steelmaking molten cooling slag.

The present application relates to a kind of water jet polishing surface platinum crucible cleaning method.The scheme is: with vacuum flip chuck (15) suction crucible (14) outer bottom or inner bottom, nozzle (10) is aimed at crucible inner surface or outer surface any point, with water jet respectively washes the inner wall, outer wall, inner bottom and outer bottom of crucible (14), complete first cleaning;With hot air and normal temperature air blow dry, weigh the mass of first cleaning after crucible (14), record as m1 gram;Repeat second cleaning, and the mass of repeated cleaning crucible is weighed again, record as m2;The difference of m1-m2 is calculated, when the difference <0.001 gram, stop cleaning;When the difference >0.001 gram, repeat cleaning until the difference <0.001 gram, stop cleaning;Pure water flushing, dry, obtain clean crucible.The present application has no acid emission, environment-friendly, improve efficiency and reduce pollution error.

The invention discloses a high-performance large-size 1t; 111gt, 111gt; the invention relates to a c-oriented PST single crystal and a preparation method thereof, and belongs to the technical field of relaxor ferroelectric crystal materials, the preparation method comprises the following steps: filling PST-cosolvent mixed powder into a platinum crucible with a cover, compacting and sealing, putting the platinum crucible into a crystal growth furnace, and using a corundum crucible, the whole crystal growth process being an oxygen introduction mode; growing in a high-purity oxygen protection atmosphere at the temperature of 1220-1250 DEG C by adopting a cosolvent method, regulating and controlling the degree of supercooling through gradient cooling, and growing the pseudo-cubic PST crystal until the size is not smaller than a set size; the atmosphere in the furnace is switched into argon protection, and the temperature is reduced to the room temperature in a segmented gradient mode; performing staged ordered annealing treatment on the crystal to obtain an annealed pseudo-cubic PST crystal; performing cutting, crystal orientation, grinding and polishing on the annealed pseudo-cubic PST crystal in sequence to obtain 1t; 111gt, 111gt; c, orienting the PST single crystal; large-size growth is realized, and B-site ions are highly ordered; 111gt, 111gt; and c, coordinated regulation and control of accurate orientation acquisition.

The invention relates to the technical field of detection, in particular to a method for measuring chromium in high-carbon ferro-chrome by an X-ray fluorescence spectrophotometer, which specifically comprises the following steps: S1, sample requirements: the granularity of a high-carbon ferro-chrome sample is greater than 180 meshes, and the high-carbon ferro-chrome sample is uniformly dried; s2, preparation of a sample glass sheet: weighing pure lithium tetraborate, pouring the pure lithium tetraborate into a platinum crucible, paving the bottom flatly with the periphery slightly higher, and forming a bowl shape for later use; weighing a high-carbon ferro-chrome sample and a high-carbon ferro-chrome oxidizing agent, uniformly mixing in the porcelain crucible, and completely pouring into the central position of lithium tetraborate in the platinum crucible; weighing a mixed reagent of lithium tetraborate and lithium metaborate, covering the surface of the mixture with the mixed reagent, adding lithium bromide, putting the mixture into a full-automatic sample melting machine, and melting to prepare a glass sheet; and S3, detecting the fluorescence excitation energy of the chromium element in the high-carbon ferro-chrome through an X-ray fluorescence spectrometry to analyze the element content. The method is short in detection period, high in accuracy, free of personal error, free of material consumption, simple and easy to operate, free of pollutant emission, environment-friendly and safe.

The invention provides a preparation method of an alpha-Fe2O3 single crystal, which comprises the following steps: mixing Fe2O3 powder and a core ternary fluxing agent LiF-KF-B2O3 to form a mixed raw material; the mixed raw materials are placed in a platinum crucible, and the temperature in the platinum crucible is increased to 780-850 DEG C; the temperature in the platinum crucible is constant, so that the melt of the mixed raw materials is homogenized; introducing a seed crystal into the platinum crucible, then carrying out gradient cooling on the inside of the platinum crucible, and slowly cooling to 750-770 DEG C; after the temperature in the platinum crucible is reduced to 700-730 DEG C, lifting the crystal in the platinum crucible, and cooling and annealing the crystal until the temperature is reduced to room temperature; and removing the fused salt on the crystal by adopting boiling water leaching, and washing and removing the residual B2O3 on the crystal by using 5% diluted hydrochloric acid, so as to obtain the alpha-Fe2O3 single crystal. According to the invention, the limitation of single crystal size is broken through, the energy consumption is obviously reduced, the product purity is improved, and the photocatalytic and electrochemical properties are improved.

This utility model relates to a crucible clamp for gripping a platinum crucible, comprising first and second clamp arms, each clamp arm including a gripping portion, and each gripping portion including a metal substrate. The metal substrate has at least one ceramic layer on its gripping surface suitable for gripping the platinum crucible, for contact with the platinum crucible. A transition layer, bonding with both the ceramic layer and the metal substrate, with a material thermal expansion coefficient between the two, is also provided between them. This utility model's crucible clamp isolates the platinum crucible and the clamp through a ceramic layer with good high-temperature stability and low thermal conductivity, slowing down the cooling rate at the contact point and effectively preventing the diffusion and contamination of metal atoms from the gripping portion's metal substrate into the platinum crucible, thereby improving the service life of the platinum crucible.

The utility model discloses a crucible clamp assembly for a platinum crucible. The crucible clamp assembly comprises a lengthened bracket and a crucible clamp body, the lengthened bracket is used for transferring the platinum crucible from the interior of the high-temperature box to a doorway of the high-temperature box; the crucible clamp body is used for transferring a platinum crucible; the positions, making contact with the platinum crucible, of the lengthened bracket and the crucible clamp body are wrapped by platinum. The crucible clamp body and the lengthened bracket are combined for use, and the lengthened bracket can extend into the muffle furnace, so that operators are prevented from being baked at high temperature. By means of the combination of the supporting device and the supporting device, the platinum crucible can be transferred on the premise that operators are prevented from being scalded by high temperature, and meanwhile the risk that the operators clamp the platinum crucible is avoided by replacing a clamping mode with supporting. Therefore, compared with the prior art, the product is more suitable for an experiment in which the platinum crucible needs to be taken out from the muffle furnace while the platinum crucible is hot and an experiment in which the crucible must be taken out when a sample in the platinum crucible is in a molten state.

The application belongs to the technical field of quantum dot glass ceramics, and relates to a multiphase quantum dot glass ceramic with high modulus as well as a preparation method and application thereof. The glass ceramic comprises main crystal phases of eucryptite (LiAlSiO4), lithium aluminate (LiAlO2) and quantum dot cesium lead bromide (CsPbBr3). The LiAlSiO4 crystal phase is coated on the surface of the LiAlO2 crystal phase or filled in the interstitial space, forming a multiphase reinforcing structure. The CsPbBr3 quantum dot glass ceramic has excellent water stability and deformation resistance. The preparation method comprises the following steps: first, preparing a basic glass batch and a CsPbBr3 quantum dot precursor respectively, and then grinding the glass batch after melting and water quenching to obtain a basic glass powder; adopting a layered loading process, the quantum dot precursor is placed at the bottom of a platinum crucible, and then the basic glass powder is covered, and finally, the quantum dot glass ceramic is obtained through melting and homogenization, casting and controlled heat treatment. The method is simple and controllable, and the obtained product has excellent comprehensive performance and good application prospect.

The invention provides a preparation method of a CeO2 doped M type barium ferrite single crystal. The preparation method comprises the following steps: S1, carrying out vacuum drying on raw material BaCO3, Fe2O3 and CeO2 powder, a fluxing agent LiF-NaF-B2O3 and a reducing agent Zn powder; s2, weighing and mixing the raw materials, the fluxing agent and the reducing agent to obtain a mixed raw material; s3, filling the mixed raw materials into a platinum crucible; s4, the platinum crucible is subjected to programmed heating and heat preservation, so that the mixed raw materials are fully molten and react, and a melt with uniform chemical components is formed; s5, slowly cooling the platinum crucible, 001gt, 001gt; inserting the oriented seed crystal into the surface of the melt, and rotating; the programmed cooling of the platinum crucible is extremely slow, and meanwhile, the lifting operation is matched; s6, after crystal growth is completed, programmed cooling is conducted to the room temperature, then annealing treatment is conducted, and therefore the CeO2 doped M-type barium ferrite single crystal is obtained. Precise valence state regulation and control are achieved, size limitation is broken through, heavy metal pollution is thoroughly eliminated, and comprehensive performance is optimized.

The application specifically relates to a method for analyzing the content of impurity elements in a neodymium iron boron material by a fusion sample preparation-X-ray fluorescence spectrometry, and belongs to the technical field of analytical chemistry and material detection. The method comprises the following steps: after grinding, a sample is pre-fused in a platinum-gold crucible by using anhydrous lithium tetraborate to form a protective layer; lithium carbonate is added as an oxidant and vanadium pentoxide is added as an internal standard, and after pre-oxidation in stages, the sample is high-temperature fused to prepare a glass sheet; under optimized instrument conditions, a working curve is established by using a series of standard fusion sheets, a to-be-measured fusion sheet is measured, and the content of each element is calculated. Through the synergistic technology of the "flux protective layer-dry pre-oxidation-internal standard correction", two major problems of corrosion of active metals on the crucible and correction of the complex matrix effect are solved, and 10 kinds of elements such as Al, Cu, Co, Ga, Dy and Tb can be simultaneously and accurately measured. The method is safe in operation, high in efficiency and good in reproducibility, and is suitable for quality control and composition analysis of a neodymium iron boron permanent magnet material.

The invention discloses automatic equipment for appearance shaping of a hemispherical platinum crucible, and relates to the technical field of shaping, the automatic equipment specifically comprises a mold supporting plate and a rotation driving device, the mold supporting plate is used for supporting the hemispherical crucible, and the rotation driving device drives the mold supporting plate to intermittently rotate; the swing assembly comprises a first swing arm and a second swing arm which are arranged at an included angle and rotate synchronously; and the two knocking assemblies are arranged on the first swing arm and the second swing arm correspondingly, and the first swing arm and the second swing arm drive the knocking assemblies to swing in a reciprocating mode within a set angle, so that the knocking assemblies knock the surface of the hemispherical crucible. The crucible is knocked back and forth through the double-swing-arm structure, and the included angle between the double-swing-arm structure is set to be 90 degrees, so that the knocking time is shortened by more than half, the production efficiency is greatly improved, and the problem that hands of personnel cannot bear long-time knocking action when the personnel hold a plastic rod to knock a spherical surface manually is solved.