Novel nonaqueous precipitation synthesis of alumina powders
Source abstract
Abstract
Abstract Alumina powders were prepared via a novel nonaqueous precipitation method with aluminum powders as aluminum source and anhydrous acetic acid as precipitant. The thermal decomposition and phase transformation of crystal precipitate and the influence of precipitate aging were investigated via TG-DTA-MS, XRD, TEM, BET, FE-SEM and performance tests of sintered bodies. The results show crystal precipitate C 4 H 7 AlO 7 transforms to amorphous Al 2 O 3 at 300 °C, and then to γ -Al 2 O 3 at 950 °C, and finally to α -Al 2 O 3 at 1050 °C. The particle size of α -Al 2 O 3 prepared at 1100 °C is 50–100 nm with BET surface area of 25.98 m 2 ∙g −1 . FE-SEM morphology of sintered sample at 1400 °C shows excellent sinterability of the α -Al 2 O 3 powders. Aging eliminates aggregation, and leads to highly homogenized and densified particles. It also affects the densification behaviour during sintering and further influences density, thermal expansion coefficient, flexural strength, volume resistivity and electric breakdown strength of sintered bodies
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. Grain‐size and R‐curve effects in the abrasive wear of alumina10.1111/j.1151-2916.1989.tb09718.x ↗
2. Evaluated material properties for a sintered alpha‐alumina10.1111/j.1151-2916.1997.tb03074.x ↗
3. Dorre · 1984
4. J.L. Katz, C.H. Hung, Ceramic oxide powders and the formation thereof, US Patent 5268337, 1993.
5. Preparation in a hydrogen-oxygen flame of ultrafine metal oxide particles10.1016/0021-9797(72)90144-0 ↗
6. W.J. Roe, J.L. Perisho, Use of polymers in alumina precipitation in the Bayer process of bauxite beneficiation, US Patent 4608237, 1986.
7. Method of producing pure alumina by spark discharge process and the characteristics thereof
8. High-temperature heat contents of aluminum oxide, aluminum sulfate, potassium sulfate, ammonium sulfate and ammonium bisulfate110.1021/ja01217a025 ↗
9. Deposition of α-alumina via combustion chemical vapor deposition10.1016/j.tsf.2006.07.033 ↗
10. Lasers-driver synthesis of nanocrystalline alumina powders from gas-phase precursors10.1063/1.109672 ↗
11. Synthesis of ultrafine alumina powder by sol-gel techniques
12. Preparation of alumina gels by a non-hydrolytic sol-gel processing method10.1016/0022-3093(94)90052-3 ↗
13. Nonhydrolytic sol-gel routes to oxides10.1021/cm970322a ↗
14. Preparation of high thermal-stabile alumina by reverse microemulsion method10.1016/j.matchemphys.2004.11.012 ↗
15. Synthesis of nanoporous metal oxide particles by a new inorganic matrix spray pyrolysis method10.1021/cm010957g ↗
16. Preparation of nano size α-Al2O3 powders by seeding hydrothermal synthesizing method
17. Mechanochemically synthesized high alumina cement and their implementation as low cement castables with some micro-fine additives10.1016/j.jascer.2014.11.004 ↗
18. Formation of nano-sized alumina by in-flight oxidation of aluminium powder in a thermal plasma reactor10.1016/j.scriptamat.2003.09.001 ↗
19. Preparation and sintering of sic particulate dispersed al2o3 fine powders by spray pyrolysis method
20. Effect of high energy ball milling on compressibility and sintering behavior of alumina nanoparticles10.1016/j.ceramint.2011.12.012 ↗
21. Self-assembly synthesis of organized mesoporous alumina by precipitation method in aqueous solution10.1016/j.micromeso.2006.02.024 ↗
22. W.L. Kehl, Thermally stable phosphate containing alumina precipitates and their method of preparation, US Patent 4080311, 1978.
23. Synthesis of layered double hydroxides containing Mg2+, Zn2+, Ca2+ and Al3+ layer cations by co-precipitation methods—A review10.1016/j.apsusc.2016.04.150 ↗
24. Economical synthesis of nano alumina powder using an aqueous sol–gel method10.1016/j.matlet.2008.03.012 ↗
25. Particle size distribution analysis of an alumina powder: influence of some dispersants, pH and supersonic vibration10.4028/www.scientific.net/MSF.498-499.73 ↗
26. Study of the mechanism of changes in electrical resistance when heating caking and noncaking coals10.1016/S0378-3820(02)00084-X ↗
27. Thermal degradation characteristics of rigid polyurethane foam and the volatile products analysis with TG-FTIR-MS10.1016/j.polymdegradstab.2013.09.032 ↗
28. Size separation of silver nanoparticles by dead-end ultrafiltration: description of fouling mechanism by pore blocking model10.1016/j.memsci.2013.12.051 ↗
29. Analysis of the character of film decomposition of methyl methacrylate (mma) coated urea by infrared spectrum
30. Fast removal of copper ions by gum arabic modified magnetic nano-adsorbent10.1016/j.jhazmat.2007.01.079 ↗
31. Isotopic-spin-one boson Regge trajectories10.1007/BF02721145 ↗
32. Structural and chemical analysis of silica-doped β-TCP ceramic coatings on surgical grade 316l ss for possible biomedical application10.1016/j.jascer.2015.06.004 ↗
33. Chemical deposition of Al2O3 thin films on Si substrates10.1016/j.tsf.2009.02.085 ↗
34. Effect of fluoride additives on production and characterization of nano-α-Al2O3, particles10.1007/s12034-014-0734-6 ↗
35. Theoretical investigation of electron paramagnetic resonance parameters and lattice distortion in alpha-Al2O3 crystal doped with V3+ ions10.1080/10420150600825800 ↗
36. Damage and damage resistance of high strength concrete under the action of load and freeze-thaw cycles10.1016/S0008-8846(99)00097-6 ↗
37. On the griffith-irwin fracture theory10.1115/1.3643965 ↗
38. Ostwald ripening theory: applications to fluorocarbon emulsion stability10.1016/0001-8686(92)80043-W ↗
39. Review progress in ostwald ripening theories and their applications to nickel-base superalloys part I: ostwald ripening theories10.1023/A:1015388912729 ↗
40. Surface energy effects for small holes or particles in elastomers10.1002/pol.1969.160070904 ↗