Fused alumina or electric fused alumina is made by fusing aluminous raw materials electrically. The fused product from an electric arc furnace is cooled in ingots, crushed and classified in different grades. Fused alumina includes brown fused alumina and white fused alumina.
Abstract. Electroceramic calcium copper titanates (CaCu 3 Ti 4 O 12, CCTO), with high dielectric permittivities (ε) of approximately 10 5 and 10 4, respectively, for single crystal and bulk materials, are produced for a number of well-established and emerging applications such as resonator, capacitor, and sensor.
Tungsten-based alloy material sintered at a high sintering power that may contain additive elements soluble in the nickel and selected from the group constituted, for example, by rhenium, molybdenum, tantalum, niobium, vanadium or a mixture of these, wherein, after sintering in liquid phase at a temperature of around 1500° C., it has: a two-phased α-γ microstructure that is fully densified
The figure in the left shows the original state of the green compact including alpha‐silicon nitride with a thin SiO 2 film and sintering additives (ZrSi 2 and MgO). The figure in the middle shows the β‐Si 3 N 4 grains were in situ generated by the reaction between ZrSi 2 and native SiO 2.
201042The process of sintering materials in the conventional methods is incorporated with mixing of material powder with additive, milling, and pressing into green parts followed by sintering with indirect heating of green pellets at about 0.6-0.8Tm in a refractory-type electrical resistance furnace, induction furnace or fossil fuel furnace.
The height of the coupon is allowed to vary depending packing density and flow of the powder in the die as the powder is compacted at a constant pressure of 138 MPa. The pressed coupons were dewaxed and sintered in a vacuum furnace. The sintering cycle includes a furnace hold at 1400 °C for 60 min under a vacuum pressure of 0.03 Torr.
Spark plasma sintering (SPS), initially developed as an advanced sintering technique for consolidating nanopowders into nanostructured bulk materials, has been recently looked at in much broader perspective and gained a strong reputation of a versatile method of solid state processing of metals, ceramics, and composites.
1983830FIELD OF THE INVENTION. The invention is concerned with powder metallurgy processing of magnetic materials. BACKGROUND OF THE INVENTION. Particularly advantageous for the production of intricately shaped metallic parts is a technology known as powder metallurgy which comprises methods comprising steps of compressing metallic or precursor powders into desired shape and sintering of fusing to
To allow efficient stacking of product in the furnace during sintering and prevent parts sticking together, many manufacturers separate ware using ceramic powder separator sheets. These sheets are available in various materials such as alumina, zirconia and magnesia. They are also available in fine, medium and coarse particle sizes.
1981310In discussing the use of powder metallurgical parts for alternating current applications the authors of this article stress the importance of protecting the material against oxidation, increasing the sintering temperature, and attaining the highest possible density in order to maximize the magnetic qualities of a powder metal part.
In a sintering study of compacted copper powder, satisfactory densification was achieved in a temperature range from 750 °C to 1000 °C, and a maximum of 90% sintered density was observed when sintered at 1000 °C for 100 minutes . In the sintering of copper powder in injection molding (MIM) fine oxide reduced copper with a
Consolidation of Al2O3 Nano-powder by Magnetic Pulsed Compaction and Sintering Whung Whoe Kim Dept. of Nuclear Materials Technology Development, Korea Atomic Energy Research Institute, 150 Dukjin-dong Yuseong-gu Daejeon, 305-353, Korea 1. INTRODUCTION Nano-alumina powder produced by oxidation and hydrolysis of pure aluminum material  is
Before laser sintering, the GO and iron powder were mixed together using a magnetic stirrer in water using PVA as a dispersing agent. PVA (4 wt.% of total solution) was used to separate GO, . After that, the mixed powders were coated on the sample surface.
bauxite contains alumina up to 85% or more, and the other components such as SiO2, TiO2, and CaO can be used as natural additives for alumina sintering, that can e ectively reduce the sintering temperature and porosity and improve the properties of the materials . At present, bauxite is only