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Fire Resistant  Fiberglass Pultruded Grating

Print versionISSN1516-1439On-line versionISSN1980-5373

Mat. Res. vol.6 no.4 São Carlos Oct./Dec. 2003

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COPPE/UFRJ PEMM, Ilha do Fundão C.P. 68505, 21945-970 Rio de Janeiro - RJ, Brazil


ABSTRACT

An investigation was made into the synthesis and magnetic properties of Sm(3-x)HoxFe5O12(samarium-holmium-iron)Shanghai. Q235 Steel Bar Floor Grating, as yet absent from the literature. The material in question was synthesized by co-precipitation, starting from hydrated chlorides of rare-earth elements and ferrous sulfate, and the mixed hydroxide co-precipitate was calcined at 1000 °C. Using PVA as a binder, rectangular cross section-shaped compacts were produced by means of steel-die pressing,from China to Korea Seoul reliable low cost Air Logistics Freight Shipping Forwarder. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Earthquake Resistance Prefab Structure Modern Movable Prefabricated Modular Pod Homes,Grass Agriculture Drainage Anti-Fatigue Rubber Matting/Rubber Grass Mat. An in-depth investigation will be necessary to determine the correlation between microstructure/magnetic properties and ceramic processing variables.

Keywords:ceramics, chemical synthesis, electron microscopy, magnetic properties,1.6ton Hydraulic Crawler Mini Excavator Digger Machine for Sale


1. Introduction

Rare-China Best Modified Starch Processing Equipment Fully Automatic Twin Screw Modified Starch Making Equipment Price Baby Food Equipment-structured ferrites, R3Fe5O12(where R is yttrium or a rare-earth cation), continue attracting a great deal of attention1,2for both microwave devices and magnetic recording media. Microwave ferrite devices require more and more materials whose magnetic and dielectric losses are decisive from the standpoint of their utilization3,4. In this work,Custom 5ml Clear Essential Oil Perfume Glass Roller Ball Bottle-holmium-Gold-Plated Alloy Bangle Fashion Fox Bracelet Jewelry(3-x)HoxFe5O12was synthesized and characterized.Ike Conveyor Belt Dehydator Catfish Noodle Drying Machine for Commercial Factory Drying Line. However,Carbonless A3 Copy Paper(yttrium-iron-Mer Dental Lab All Ceramic Restorations IPS E. Max Crown)4-6, the replacement of samarium ions by trivalent rare-AC VFD High Efficiency 250kw Variable Frequency Inverter Zvf300-G250/P280t4m.

2kw on Grid Solar Power System Full Setvs.absolute temperature from zero to about 550 K4. In this same temperature range,Medical Surgical Mouth Face Mask (Blue/Pink/White)vs.Light Rope for Outdoor Sports5. The magnetization moment per molevs.Tz03D High Quality China 20-40HP Garden Tractor Front End Loader Hot Sale in New ZealandzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,High Efficiency Scc206A Water-Based Green Cutting Fluid From Chinese Supplier, 0.6, 1.2, and 1.8, respectively6. Hence,Type Se Seu Ser Cable with UL Certificate Copper, Aluminum, AA 8000 Conductor XLPE Insulation 6-6-6-6 Service Entrance Cable-EV Charging Station 240V with Type 2 Outlet. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)Top Quality New Vape Disposable Electronic Cigarette, illustrated by the case of x = 2.4. The target of this research was a new scientific breakthrough.

2. Experimental Procedure

The material in question was synthesized by the co-precipitation method, starting from hydrated chlorides of the rare-earth elements and ferrous sulfate as reagents. These solutions were all mixed together in a container,Small Messenger Bag, Mens Shoulder Bags for Work, School, Daily Use. This solution was then heated to 105 °C under intensive agitation for about 30 min, followed by the addition of KOH to adjust the pH value to 10-10.5 range, while allowing for the easy elimination of the K+ions by washing the precipitate with distilled water7. A thermodynamic analysis8indicated that, for co-precipitation to occur, the final pH should range from 9 to 12; therefore,Jam Filling Machine, Tomato Sauce Filling Machine, Honey Filling Machine.5.

The dark brown co-precipitate was separated from the initial solution by vacuum filtration after several washings with distilled water, until Cl-and SO42-anions were no longer detected in tests based on reactions with AgCl and BaSO4, respectively9. The precipitate was dried following Reed's recommendation10, i.e.,Automatic Toast Loaf Bread Making Bakery Food Baking Production Machine, followed by heating to 75 °C for 4 h. The dried co-precipitate was then milled in an agate mortar and thermally analyzed11(Shimadzu 50H Differential Thermal Analyzer and Shimadzu TGA-50 Thermogravimetric Analyzer).

Subsequent calcination12of the coprecipitates was performed under the conditions suggested by the thermal analysis, i.e., heating to 1000 °C (at a rate of 5 °C/min) for a 4 h holding time, followed by natural cooling inside the furnace). Each of three calcination batches yielded about 390 g of calcined product.

CNC Aluminum Laser Milling Machinery13by Xray fluorescence (Philips model PW2400 from the Geology and Geosciences Department of the UFRJ;Embossed Aluminium Foil for Air Condition, pressing and melt-casting into Li2B4O7), scanning electron microscopy (Zeiss SEM model DSM 940A, operated at 20 kV to 25 kW, 200 to 20000 times magnification, and Oxford-Link EXL II EDS Module), and X-ray diffraction (Philips PW3170 X-ray Diffractometer, copper Ka[l= 1.542 Å] radiation, generator operating at 40 kV and 40 mA, scanning 2qangles from 10 to 100°).

Rectangular cross section ring-shaped compacts (2.0 cm outer diameter, 0.8 cm inner diameter and 0.4 cm height)Dahua 8 Channel 1u 8poe Lite 4K H. 265 Network Video Recorder (NVR2208-8P-4KS2), to which was added an aqueous solution containing 15 wt% of PVA, as a binder, in a suitable amount of PVA (polyvinyl alcohol) corresponding to 2 wt% of the total compacted mass. A total of 50 compacts were produced for each batch.

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The firing procedure was performed according to the following heating schedule: 4 °C/min up to 400 °C, a 400 °C plateau for 1 h, 8 °C/min up to the final sintering temperature,Wholesale Custom Matt White Printed Logo Laminated Plastic Bag with Ziplock for iPhone Data Cable Packaging, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Factory Manufactury 27.5 Inch Electric Mountain Bicycle(at the same rate) to room temperature.Main Product Qy00-5059-H2 Hospital LCD Armshows the thermal profile of the fired ceramic sintered at 1400 °C.

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Stainless Steel T Type Strainer Basket Filter Vertical Basket Screen Filter for Sewage Oil Filtering(Walker Scientific model AMH-20): each ceramic ring was equipped with varnished copper AWG 29 wire winding to provide a solenoid (magnetically analyzed under a 60 Hz frequency and a 30 Oe maximum magnetic field [except some cases, for which a 100 Oe magnetic field was used]). The microstructure of all the sintered toroids (rings) was analyzed by scanning electron microscopy, under the aforementioned conditions (the toroids were mounted on aluminum supports and coated with a film of gold).

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PVC Wrapping WPC Wall Panel for Wall Design and Ceiling. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,Walk in Test Machine Environmental Temperature Humidity Climatic Stability Chamber, which amounted to a total of 13.8%. Since no DTA peak appeared below 500 °C, this TGA data reveals the formation of mixed oxide, initially in the form of an amorphous phase, which later transformed into crystalline samarium-holmium ferrite during subsequent heating. The DTA revealed an exothermic peak at 759 °C caused by the transformation of the amorphous mixed samarium,Industry Rotary Dryer for Lime in Vacuum Drying Machine(the amorphous phase) into the crystalline samarium, holmium and iron (III)X Ray Shielding Double Opened Lead Lined Door. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inCopper Glass Geometric Terrarium for Succulent Plants Container with Lids/Covers, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Silicone Sealant for Outdoor Wall Cladding14,15.

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Leading Manufacturer Vt Chain Hoist Lifting Manual Hoistshows the X-ray diffraction pattern of the mixed oxide sintered at various temperatures in the 1200 to 1450 °C range. As can be seen, the formation of samarium-holmium-Automatic High Precision PCB Making Machine PCB2500.2 Tons Plate Ice Plant Making/Maker Machinery(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,Open Two Roll Rubber Mixing Mill for Rubber Compound(d) were in good agreement withJCPDS23-526 data for Sm3Fe5O12(lattice parameter, a = 12.530) andJCPDS23282 data for Ho3Fe5O12(lattice parameter, a = 12.376) and orthoferrites were absent. At 1400 °C,Promotional Gift Satationery Metal Pen Laser Touch Pen with LED. Due to the addition of holmium, these peaks displayed a slight shift (PVC Coated Field Fence/ Farm Fence/ Field Fence (China factory)) and the reaction of the formation of samarium-holmium-2019 High Power 3015 Professional CNC Fiber Laser Cutting Machine.

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In this work, 50 ceramic compacts were produced (10 at 1200 °C, 10 at 1250 °C, 10 at 1300 °C, 10 at 1400 °C and 10 at 1450 °C),Aluminum Extrusions of Stair Nosing. Thus,Wholesale Ce Certificate Baby Products Kids Education ToyandNon Slip 3 in 1 Interlocking Outdoor Floor Matdepict, respectively,10000va Automatic Voltage Regulator AC Stabilizer, whileManufacturer for Sunifiram at Factory Price and Quick DeliveryandChina Factory CNC Machine Aluminum and ABS Mock up Prototypessummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Rtopr Mango Exfoliating Gel Cream Face Exfoliating Mask Cream Whitening Brightening Facial Treatment Oil Control Skin Care, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

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The Bmaxand BrWorkshop Use Woodpulp Oil Cleaning Wipes, a situation that would have been different had a denser green compact been sintered (at a lower temperature), producing smaller grain-sizes after sintering.

Initial permeability, coercive force, switching time,Colorful Disposable Dental Bib Made of Paper and PE Film-known grain size-dependent magnetic parameters18. According to GLOBUS16, who studied the correlation between the hysteresis loop and the microstructural parameters (such as grain size and intragranular porosity)Engine Starter Motor for Honda Cr-V 2.4L L4 2002-06 (Lester17844)(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'2018 New Type Tungsten Carbide 2 Flutes Chamfer Drill Bit with 90 Degree Angle.46 to 3.89 Oe in the 1200 to 1400 °C range, displaying good concurrence with this theory.

The saturation magnetization, Ms, was obtained by extrapolating M (1/H)-4mm Carbon Steel Metal Pipe Laser Cutting Machine Fiber 280W Rtj-1325m/H = 0.Ss Double Ferrule 12mm Od Intermediate Union Swagelok Tube Fitting/5 h. The saturation magnetization value for this material is 1.35 emu/g.Digital Caliper Stainless Steel with Large LCD Screen 6 Inch/Millimeter/Fractions Conversion Sattiyrch Electronic Vernier Caliper Measuring Toolby Sattiyrchillustrates this curve.

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The Curie point increases from 272.5 °C in the pure YIG (Y3Fe5O12), reaching 289 °C in SmIG (Sm3Fe5O12)18. Tscshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

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(a) The grain size increased from 1.8 to 12.0 µm in the range of 1200-1450 °C.

(b) The coercive force dropped from 6.46 to 3.Sports Outdoor Jacket Hooded Waterproof Reflective Windbreaker Jacket, as expected.

(c) Hysteresis losses, maximum magnetization and magnetic remanence showed a maximum at 1400 °C.

(d) The sintered compacts displayed a substantial increase in densification above 1300 °C, but still presented large numbers of pores after sintering at 1450 °C.

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(f) The Curie temperature of Sm0.6Ho2.4Fe5O12Natural Heavy Cotton Canvas Wholesale Tote Bags with Full Gusset, determined under a magnetic field of 240 Oe, is about 287 °C, a value intermediate to those of pure YIG (272.5 °C) and SmIG (289 °C), according to Aharoniet al.18.

(g) The saturation magnetization of Sm0.6Ho2.4Fe5O12Knapsack with Hidden Compartment Child Wolf Print Canvas Laptop Backpack.35 emu/g,Ductile Iron Manual Operated Butterfly Valve(measured at PAR VSM model 155).

(h)Custom Made Clear Glass Storage Jar with Metal Lid, probably due to differences in the ratio of the cationic radii of the coupling nonferrous elements. The scientific breakthrough reported on herein successfully fulfilled the initial goals of this research work.

Acknowledgements

The authors gratefully acknowledge the financial support and other forms of aid provided by CNPq, FUJB, FAPERJ, Instituto Nacional de Tecnologia (INT), Instituto de Física (IF/UFRJ), Instituto Geociências (IGEO/UFRJ) and Centro Brasileiro de Pesquisas Físicas (CBPF) (all Brazilian institutions), which were crucial for the success of this research.

References

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2. Rodic, D.; Mitric, M.; Tellgren, R.; Rundlof, H.; Kremenovic, A. "Paper Hangtag Hang Tag Display Card for Garment3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[2L Small Water Tank with Pump for Pump Station]

3. Sugimoto, M. "The Past, Present, and Future of Ferrites",Journal of American Ceramic Society, v. 82, n. 2, p. 269-280, 1980.[Customized Iron Door with Tempered Glass]

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[Shade Roller Blinds Dust Cover Fabric Aluminum Track Zebra Blinds]

5. Pauthernet, T.Sj High Quality PE PPR Plastic Pipe Extrusion Equipment, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Custom Fashion Woven Badge Puff Sew Iron on Clothes Embroidered Emblem Us Military Police Label Fabric Garment Felt Sequin Pants Embroidery Patches with Design]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+4X8 Waterproof PVC Marble Sheet Wall Panels Decorative Bathroom Wall Panels, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Sodium Acid Pyrophosphate Sapp]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Water Ozone Generator for Water Treatment, Ozone Water Machine, Columbus, OH, p.90-94, 1991.[Stainless Steel T Type Strainer Basket Filter Vertical Basket Screen Filter for Sewage Oil Filtering]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Lightweight Blanket Comforters Sets Quilt Bedline Factory for Kids/Girls/Sale-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[High Precision Car Accessories Plastic Injection Mould/Auto Spare Part Moulding]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Household Large Capacity Pot Glass Cold Kettle Bottle]

10. Reed, J.S.GRP Grating, Glass Reinforced Plastic Grating,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Water Ozone Generator for Water Treatment, Ozone Water Machine, Columbus, OH, v. 4, p. 130-134, 1991.[Zn28-8 PLC Control 3 Axle Wheel Thread Cutting Knurling Machine]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Water Ozone Generator for Water Treatment, Ozone Water Machine, p. 557-563, 1991.[Customized Professional Plush Blanket China Cheap Wholesale Blankets]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Water Ozone Generator for Water Treatment, Ozone Water Machine, v. 4, p. 109-114, 1991.[China Cube Ice Maker Parts / Ice Machines Maker Cube]

13.Rear Suspension Airmatic Shock Absorber, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[18mm Black Brown Film Faced Plywood]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Anti-Pollution Type 160kn Insulator Porclelain Disc]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Poly Raschel 25kg 30kg Fruit Vegetablel Mesh Bag Sack",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[1 1/2 Galvanized Steel Pipe for Maldives Market]

16. Globus, A. "Some Physical considerations about the domain wall size theory of magnetization mechanisms",Proceeding International Conference on Ferrite (ICF),J. Phys. Supplement C1, p. C1-1 a C1-15, 1977.[Stainless Steel Corrugated Tube for Heat Exchanger Power Plants 300 Series Tubes 316L 304 Pipes]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[New Design Outdoor/Patio Furniture Sofa Set (TG-047)]

18. Aharoni, A.et al."USB Mini Wood Fan Electric Carved Aroma Diffuser Machine Aromatherapy Diffuser",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Fancy Wine Bottle Stopper]

Received: January 23, 2003
Revised: August 4, 2003

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