The complex coating on the MgO CaO clinker was prepared by dipping method and adding the second mineral to restrain the formation and expansion of the cracks. Meanwhile, the microstructure and the morphology of the c...The complex coating on the MgO CaO clinker was prepared by dipping method and adding the second mineral to restrain the formation and expansion of the cracks. Meanwhile, the microstructure and the morphology of the coating and hydration resistance of the MgO CaO clinker were also investigated. The result shows that the coating consists mainly of Ca 2P 2O 7, MgO and CaCO 3, its thickness ranges from 5μm to 20μm, and the coating is dense and even, no micro cracks are observed. Also, the coating adheres closely to the matrix. The hydration resistance of the MgO CaO clinker after treatment is improved greatly, and the castables prepared with the treated MgO CaO clinker have better physical properties than MgO castable.展开更多
YB/T 4116-2003 1 ScopeThis standard specifies the classification, technical requirements, test methods, inspection rules, packing, marking, transportation, storage and quality certificate of magnesia calcia brick.This...YB/T 4116-2003 1 ScopeThis standard specifies the classification, technical requirements, test methods, inspection rules, packing, marking, transportation, storage and quality certificate of magnesia calcia brick.This standard is applicable to the fired magnesia calcia brick for the metallurgical furnaces, such as AOD, VOD, LF and building materials industry kilns such as cement rotary kiln.2 Normative ReferencesThe following standards contain provisions, which through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest recent editions of the standards indicated below. GB/T 2992: Shape and dimension of general refractory bricksGB/T 2997-2000: Test method for the bulk density, apparent porosity and true porosity of dense shaped refractory productsGB/T 5069.2-2001: Chemical analysis of magnesia and magnesia-alumina refractory material-Molybdenum blue photometric method for determination of silicon dioxide contentGB/T 5069.4-2001: Chemical analysis of magnesia and magnesia-alumina refractory material-Ortho-phenanthroline photometric method for determination of iron oxide contentGB/T 5069.6-2001: Chemical analysis of magnesia and magnesia-alumina refractory material-Chromazurol S photometric method for determination of aluminium oxide content展开更多
Calcia stabilized zirconia（CSZ） ceramics were prepared with 7wt% calcia-stabilized zirconia powder by pressureless sintering technology. The crystal phases of the sintered samples were studied by X-ray diffraction（...Calcia stabilized zirconia（CSZ） ceramics were prepared with 7wt% calcia-stabilized zirconia powder by pressureless sintering technology. The crystal phases of the sintered samples were studied by X-ray diffraction（XRD） and Raman spectroscopy techniques, and the microstructures of the fracture surfaces were observed by scanning electron spectroscopy（SEM）. The phase compositions and the lattice parameters of cubic calcia-stabilized zirconia were calculated by XRD patterns. As the sintering temperature increasing from 1400℃ to 1600℃, the monoclinic zirconia content decreases gradually, finally all monoclinic phase transforms to cubic calcia-stabilized zirconia, which is deter- mined to be Ca0.134Zr0.866O1.866. It is revealed that monoclinic zirconia is the main factor causing minute cracks on the surface of sintered samples, and the combination of the XRD patterns and Raman spectra is an effective way to research the phase transformations of zirconia.展开更多
Studies were conducted on how the structure and property of magnesia castable was affected when the magnesia zirconia calcium composite was incorporated. The experimental result indicates that the component CaZrO 3 is...Studies were conducted on how the structure and property of magnesia castable was affected when the magnesia zirconia calcium composite was incorporated. The experimental result indicates that the component CaZrO 3 is easily decomposed by reacting with silica fume to form a low melting point material CMS and CaZr 4O 9 in the silica fume bonded MgO castable, resulting in occurrence of microcracks, which will improve the thermal shock resistance and strength at moderate temperature. In a word, CaZrO 3 improves slag infiltration resistance in spite of lowering the slag corrosion resistance, by absorbing and reacting with components in the slag like Al 2O 3, TiO 2 and FeO.展开更多
The development status, production technology and characteristics of MgO-CaO refractories are introduced, covering MgO-CtlO clilnkers, fired MgO-CaO bricks and unburned MgO-CaO-C bricks. The applications o! MgO-CaO re...The development status, production technology and characteristics of MgO-CaO refractories are introduced, covering MgO-CtlO clilnkers, fired MgO-CaO bricks and unburned MgO-CaO-C bricks. The applications o! MgO-CaO refractories in secondary refinitzg furnaces including AOD, VOD, LF-VD and GOR are inttwtuced.展开更多
文摘The complex coating on the MgO CaO clinker was prepared by dipping method and adding the second mineral to restrain the formation and expansion of the cracks. Meanwhile, the microstructure and the morphology of the coating and hydration resistance of the MgO CaO clinker were also investigated. The result shows that the coating consists mainly of Ca 2P 2O 7, MgO and CaCO 3, its thickness ranges from 5μm to 20μm, and the coating is dense and even, no micro cracks are observed. Also, the coating adheres closely to the matrix. The hydration resistance of the MgO CaO clinker after treatment is improved greatly, and the castables prepared with the treated MgO CaO clinker have better physical properties than MgO castable.
文摘YB/T 4116-2003 1 ScopeThis standard specifies the classification, technical requirements, test methods, inspection rules, packing, marking, transportation, storage and quality certificate of magnesia calcia brick.This standard is applicable to the fired magnesia calcia brick for the metallurgical furnaces, such as AOD, VOD, LF and building materials industry kilns such as cement rotary kiln.2 Normative ReferencesThe following standards contain provisions, which through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest recent editions of the standards indicated below. GB/T 2992: Shape and dimension of general refractory bricksGB/T 2997-2000: Test method for the bulk density, apparent porosity and true porosity of dense shaped refractory productsGB/T 5069.2-2001: Chemical analysis of magnesia and magnesia-alumina refractory material-Molybdenum blue photometric method for determination of silicon dioxide contentGB/T 5069.4-2001: Chemical analysis of magnesia and magnesia-alumina refractory material-Ortho-phenanthroline photometric method for determination of iron oxide contentGB/T 5069.6-2001: Chemical analysis of magnesia and magnesia-alumina refractory material-Chromazurol S photometric method for determination of aluminium oxide content
基金Funded by the National Natural Science Foundation of China(No.10574102)
文摘Calcia stabilized zirconia（CSZ） ceramics were prepared with 7wt% calcia-stabilized zirconia powder by pressureless sintering technology. The crystal phases of the sintered samples were studied by X-ray diffraction（XRD） and Raman spectroscopy techniques, and the microstructures of the fracture surfaces were observed by scanning electron spectroscopy（SEM）. The phase compositions and the lattice parameters of cubic calcia-stabilized zirconia were calculated by XRD patterns. As the sintering temperature increasing from 1400℃ to 1600℃, the monoclinic zirconia content decreases gradually, finally all monoclinic phase transforms to cubic calcia-stabilized zirconia, which is deter- mined to be Ca0.134Zr0.866O1.866. It is revealed that monoclinic zirconia is the main factor causing minute cracks on the surface of sintered samples, and the combination of the XRD patterns and Raman spectra is an effective way to research the phase transformations of zirconia.
文摘Studies were conducted on how the structure and property of magnesia castable was affected when the magnesia zirconia calcium composite was incorporated. The experimental result indicates that the component CaZrO 3 is easily decomposed by reacting with silica fume to form a low melting point material CMS and CaZr 4O 9 in the silica fume bonded MgO castable, resulting in occurrence of microcracks, which will improve the thermal shock resistance and strength at moderate temperature. In a word, CaZrO 3 improves slag infiltration resistance in spite of lowering the slag corrosion resistance, by absorbing and reacting with components in the slag like Al 2O 3, TiO 2 and FeO.
文摘The development status, production technology and characteristics of MgO-CaO refractories are introduced, covering MgO-CtlO clilnkers, fired MgO-CaO bricks and unburned MgO-CaO-C bricks. The applications o! MgO-CaO refractories in secondary refinitzg furnaces including AOD, VOD, LF-VD and GOR are inttwtuced.
