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Li T.,Wuhan University of Science and Technology | Li N.,Wuhan University of Science and Technology | Yan W.,Wuhan University of Science and Technology | Zhang H.,Puyang Refractories Group Co. | And 2 more authors.
International Journal of Applied Ceramic Technology | Year: 2017

A new type of low-carbon magnesia carbon refractory (LCMCR) substituting for MgO-Cr2O3 refractory was successfully used in vacuum oxygen decarburization (VOD) ladle slagline, and the composition and microstructure of the used LCMCR were investigated. The results indicated that the decarburizing reaction (MgO-C reaction) in the LCMCR under the VOD refining condition (high temperature, low pressure) was inhibited due to the low carbon content in the MgO-C refractory and the dense layer formed between slag and original layer. The dense layer prevented the penetration of the external O2 into the LCMCR inside because of the lower permeability of this layer, and thus, the direct burnout of the C in the LCMCR was substantially restrained. On the other hand, the large size crystal and the ultra-low inclusions (SiO2 and Fe2O3) content of the fused magnesia in the LCMCR made the magnesia more slag resistance, because the grain boundary in magnesia had higher slag penetration resistance and the contact area between the slag and the magnesia was reduced. The two aspects of the inhibited decarburizing reaction and the high quality magnesia synthetically contributed to the high slag resistance of the LCMCR. © 2017 The American Ceramic Society.


Liang F.,Wuhan University of Science and Technology | Li N.,Wuhan University of Science and Technology | Liu B.,Puyang Refractories Group Co. | He Z.,Puyang Refractories Group Co.
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2016

Carbon nanotubes (CNTs) have often been used as additives to improve the properties of refractories containing carbon. However, it is very difficult to evenly distribute CNTs in the matrix. In order to solve this difficulty, an alumina/multi-walled carbon nanotube (MWCNT) (AM) composite powder in which MWCNTs had grown on the surfaces of Al2O3 particles was developed and used in alumina-carbon (Al2O3-C) refractories. The effects of the AM composite powders on the microstructure and properties of the Al2O3-C refractories were studied and compared with the commercial MWCNTs. The nanocomposite powders significantly improved the distribution uniformity of MWCNTs in the Al2O3-C matrix. The densification, fracture properties, thermal shock resistance, and slag corrosion resistance were enhanced due to the well-dispersed MWCNTs. On the contrary, no improvement of the densification, fracture properties, and thermal shock resistance of the refractories was achieved by addition of commercial MWCNTs due to the agglomeration of MWCNTs. © 2016 The Minerals, Metals & Materials Society and ASM International


Tian X.L.,Xi'an University of Architecture and Technology | Xue Q.H.,Xi'an University of Architecture and Technology | Xue C.B.,Puyang Refractories Group Co.
Advanced Materials Research | Year: 2012

Thermodynamic analysis on destabilizing effect of zirconia products caused by aluminum is carried on by using material Gibbs free energy function, and then the experimental verification was tested by scanning electron microscope (SEM). The results show that: 1) aluminum reacts with calcium oxide, the stabilizer of zirconia, forming some sheet-like calcium hexaluminate. It results in the stabilizer loss and the volume destabilization of zirconia. 2) Aluminum reacts with magnesium oxide, the stabilizer of zirconia, forming some octahedral magnesia-alumina spinel. It results in the stabilizer loss and the volume destabilization of zirconia. 3) The destabilizing effect of zirconia caused by aluminum can be defined three layers, which are original layer, transition layer and reaction layer. © (2012) Trans Tech Publications.


Yu J.K.,Northeastern University China | Chen Y.,Northeastern University China | Yan G.H.,Puyang Refractories Group Co.
Materials Research Innovations | Year: 2014

The effect of TiO2 additive on the synthesis of dense forsterite is investigated in the present work. As the intermediate phase formed in the synthesis process, the magnesium titanate plays a very important role in the improvement of the formation and densification of forsterite. Notably, it finally transfers into a high melting point second phase when segregated at a higher sintering temperature. The addition of TiO2 improves the density of forsterite at a low temperature by liquidphase sintering and may reduce or even eliminate the defects of liquid phase-sintering by the segregation of the liquid phase at high temperature. © 2014 W. S. Maney & Son Ltd.


Tian X.,Xi'an University of Architecture and Technology | Tian X.,Puyang Refractories Group Co. | Xue Q.,Xi'an University of Architecture and Technology | Xue C.,Puyang Refractories Group Co.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2012

Al 2O 3-ZrO 2 composite powders (Al 2O 3content of 51.74% in mass, ZrO 2 content of 44.95% in mass) were synthesized by a sol-gel process using AlCl 3·6H 2O and ZrOCl 2·8H 2O as starting materials, and NH 3·H 2O as a precipitant. Chemical composition, mineral phase and particle size distribution of the composite powders were investigated by X-ray fluorescence instrument, X-ray diffractometer, thermogravimetric analyzer, laser particle size analyzer and scanning electron microscope. The results showed that the chemical composition of the alumina-zirconia composite powders synthesized by the sol-gel process were homogeneous and the particle size was fine (< 0.5 μm about 5%, 0.5-5.0 μm about 55%, > 5.0 μm about 40%). The crystallization could be improved when the heat treatment temperature was increased. The main crystalline phase was t-ZrO 2 at heat treatment temperature of 800°C and that were lots of t-ZrO 2, little corundum and trace c-ZrO 2at 1200°C. The corundum and c-ZrO 2 increased when heat treatment temperature was higher than 1350°C.


Lou H.,Puyang Refractories Group Co.
Naihuo Cailiao/Refractories | Year: 2013

An environmental-friendly hot repairing mix for large area of converter was prepared using high purity magnesia, middle grade magnesia, dolomite as main starting materials, high temperature modified asphalt and phenolic resin, etc. as binders, polybasic alcohol as flow aid, adding a little wetting agent. The practical service shows that the repairing mix performs good high temperature fluidity, short hardening time, high strength, long service life(the average service life is over 30 heats), and environmental-friendly.


Wang J.,Puyang Refractories Group Co.
Naihuo Cailiao/Refractories | Year: 2013

High alumina based plastic refractories were prepared using bauxite particles and fines, and clay as main starting materials. Influences of three binders including water, saturated aluminium sulfate solution, mixed solution of saturated aluminium sulfate and aluminium dihydrogen phosphate on properties of the refractories were investigated. The results show that; the refractory, with saturated aluminium sulfate solution has the longest shelf life, and that with the mixed solution has the shortest shelf life; the cold compressive strength of the dried refractories bonded with saturated aluminium sulfate solution or the mixed solution is higher than that of the dried refractory with water bonded; the bulk densities and values of refractoriness under load(0.5%, 1%, 2% of deformation) of the three refractories are similar.


Jianzhu W.,Xi'an University of Architecture and Technology | Junxue Z.,Puyang Refractories Group Co.
Advanced Materials Research | Year: 2013

Samples of Al2O3-C materials were prepared, based on the tabular corundum and recycled materials as raw materials, natural graphite as carbon source, Si as antioxidant and phenolic resin as binder. The physical properties were determined and the microstructure evolution in the samples were analyzed by scanning electron microscopy. The results shows that, Firstly the apparent porosity rate change little and the body density decreases much with the amount of recycled materials increasing. Secondly the room temperature strength and the high temperature strength decreases when the amount of recycled materials increases. Especially the strength of sample decreases rapidly when the amount of recycled materials is over 15(wt)%. In addition, the grain of recycled materials are wrapped up in the face by a powder layer. The body density and the strength of samples decrease because of the apparent porosity. © (2013) Trans Tech Publications, Switzerland.


Trademark
Puyang Refractories Group Co. | Date: 2010-07-27

Refractory construction materials of metal; refractory castable mixes of metal; refractory shapes of metal; refractory furnace linings of metal; semi-refractory bricks of metal; fired refractory materials of metal; metal tiles; metal hardware, namely, washers; screws of metal; metal shims; metal bolts; screw rings of metal; pegs of metal; cermets; tubes of metal; steel pipes and tubes. Casting machines; continuous metal casting machines; concrete vibrators; mixing machines; hydraulic valve actuators; hydraulic pumps; valves being parts of machines; valves for pumps; pneumatic valve actuators; vehicle pneumatic and hydraulic compressors; pneumatic controls for machines, motors and engines; garbage disposals. [ Lights for vehicles; refractory furnaces; electric stoves; ceramic stoves; toilet bowls; toilet seats; urinals (sanitation fixtures); chimney flues; ceramic plates sold as parts of stoves; tap water faucets ]. [ Insulating materials; insulating refractory materials; non-metal sealing rings for use as connection seals; rings of rubber for use as pipe connection seals; gasket sealer for use in plumbing; joint packing for gas filled pipe; pipe jackets, not of metal for use with graphite pipe; plastic sections for use in the manufacture of spacer frames for use as building materials for heat-insulating applications; synthetic rubber; semi-worked synthetic resins as semi-finished products in form of pellets, rods, foils, foams, fibers, films and sheets; thermoplastic flexible tubes for carrying fluid to a nozzle for water jetting equipment; packaging materials made from stone-based plastic substitutes ]. Stones; non-agricultural lime for use in construction; fireclay; clay ash; fired bricks; gypsum; cement, namely, almina cement, cement mixes, filling cement, hydraulic cement, magnesia cement, portland cement, silica cement (pozzolanic cement); concretes building elements, namely, concrete, concrete walls for building, non-metal casting forms for concrete, refractory concrete, concrete blocks; tiles of not metal, namely, ceramic tiles, fireproof tiles, glass tiles, gypsum tiles, earthenware tile; pitch; building glass; window glass; adhesive mortar for building purposes; ceramic bricks for use in refractory furnaces; ceramic shapes for use in refractory furnaces; fired refractory materials, not of metal; refractory blocks, not of metal; refractory bricks, not of metal; refractory castable mixes, not of metal; refractory concrete; refractory construction materials, not of metal; refractory furnace linings, not of metal; refractory mortars; refractory shapes, not of metal; sculptures of marble or stone; monuments of stone or marble; statues of marble; tombstones of stone, concrete or marble. [ Glass for everyday use, namely, cups, plates, kettles, glass jars; flasks; carafes; ceramic sculptures, vases, vessels, bowls, plates and pots; sculptures of earthenware; jars for jams and jellies of earthenware; ornaments of porcelain (not including Christmas tree ornaments); statuettes of earthenware; tea sets; wash basins (bowls, not parts of sanitary installations); heat-insulated vessels; glass for vehicle windows (unfinished); aquarium hoods ].


Pn

Trademark
Puyang Refractories Group Co. | Date: 2010-11-09

Refractory construction materials of metal; refractory castable mixes of metal; refractory shapes of metal; refractory furnace linings of metal; semi-refractory bricks of metal; fired refractory materials of metal; metal tiles; metal hardware, namely, washers; screws of metal; metal shims; metal bolts; screw rings of metal; pegs of metal; cermets; tubes of metal; steel pipes and tubes. Casting machines; continuous metal casting machines; concrete vibrators; mixing machines; hydraulic valve actuators; hydraulic pumps; valves being parts of machines; valves for pumps; pneumatic valve actuators; vehicle pneumatic and hydraulic compressors; pneumatic controls for machines, motors and engines; garbage disposals. [ Lights for vehicles; refractory furnaces; electric stoves; ceramic stoves; toilet bowls; toilet seats; urinals (sanitation fixtures); chimney flues; ceramic plates sold as parts of stoves; tap water faucets ]. [ Insulating materials; insulating refractory materials; non-metal sealing rings for use as connection seals; rings of rubber for use as pipe connection seals; gasket sealer for use in plumbing; joint packing for gas filled pipe; pipe jackets, not of metal for use with graphite pipe; plastic sections for use in the manufacture of spacer frames for use as building materials for heat-insulating applications; synthetic rubber; semi-worked synthetic resins as semi-finished products in form of pellets, rods, foils, foams, fibers, films and sheets; thermoplastic flexible tubes for carrying fluid to a nozzle for water jetting equipment; packaging materials made from stone-based plastic substitutes ]. Stones; non-agricultural lime for use in construction; fireclay; clay ash; fired bricks; gypsum; cement, namely, alumina cement, cement mixes, filling cement, hydraulic cement, magnesia cement, portland cement, silica cement (pozzolanic cement); concrete building elements, namely, concrete, concrete walls for building, non-metal casting forms for concrete, refractory concrete, concrete blocks; tiles not of metal, namely, ceramic tiles, fireproof tiles, glass tiles, gypsum tiles, earthenware tile; pitch; building glass; window glass; adhesive mortar for building purposes; ceramic bricks for use in refractory furnaces; ceramic shapes for use in refractory furnaces; fired refractory materials, not of metal; refractory blocks, not of metal; refractory bricks, not of metal; refractory castable mixes, not of metal; refractory concrete; refractory construction materials, not of metal; refractory furnace linings, not of metal; refractory mortars; refractory shapes, not of metal; sculptures of marble or stone; monuments of stone or marble; statues of marble; tombstones of stone, concrete or marble. [ Glass for everyday use, namely, cups, plates, kettles, glass jars; flasks; carafes; ceramic sculptures, vases, vessels, bowls, plates and pots; sculptures of earthenware; jars for jams and jellies of earthenware; ornaments of porcelain (not including Christmas tree ornaments); statuettes of earthenware; tea sets; wash basins (bowls, not parts of sanitary installations); heat-insulated vessels; glass for vehicle windows (unfinished); aquarium hoods ].

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