MgO-CaO ceramics with enhanced microhardness and hydration resistance were successfully prepared by doping Y_(2)O_(3)in this work.The effects of introducing Y_(2)O_(3)on the microstructure and properties of MgO-CaO ce...MgO-CaO ceramics with enhanced microhardness and hydration resistance were successfully prepared by doping Y_(2)O_(3)in this work.The effects of introducing Y_(2)O_(3)on the microstructure and properties of MgO-CaO ceramics were investigated.The microstructural regulation effects of Y_(2)O_(3)additive on MgO,CaO,and MgO-CaO ceramics were analyzed comparatively.The results show that Y_(2)O_(3)dissolves into the CaO lattice to form solid solution in CaO ceramics,and no obvious intergranular phase forms.While the Y_(2)O_(3)additive leads to the micro structural reconstruction in MgO and MgO-CaO ceramics.By adding Y_(2)O_(3),SiO_(2)impurity from magnesium source reacts with CaO to form the silicate phases containing Y^(3+)ions in MgO-CaO ceramics.The increase in the MgO/CaO interface and the microstructural reconstruction synergistically improves the microhardness and hydration resistance of MgO-CaO ceramics markedly.展开更多
The slag-resistance and microstructural changes after the slag tests of MgAlON spinel containing different amount of nitrogenwere studied by means of crucible slag-resistant experiment, SEM and EDS in the work. The re...The slag-resistance and microstructural changes after the slag tests of MgAlON spinel containing different amount of nitrogenwere studied by means of crucible slag-resistant experiment, SEM and EDS in the work. The results show that the slag-resistance ofMgAlON is dependent on the nitrogen content, and the optimum amount is 2.88%. The strUcture is not changed although the grains havebeen permeated by some silicon, calcium and iron. A glass phase which contained nitrogen formed in the metaInorphic layeL The glasscan driprove the ability of the slag-resistance of MgAlON because of its higher viscosity.展开更多
Alumina-magnesia refractory castables have been widely used in the wall and bottom impact pad of steel ladles. The properties of alumina-magnesia refractory castables with SnO2 additive in 0 - 5 wt% range were investi...Alumina-magnesia refractory castables have been widely used in the wall and bottom impact pad of steel ladles. The properties of alumina-magnesia refractory castables with SnO2 additive in 0 - 5 wt% range were investigated. The phase composition, microstructure, physical and mechanical properties of these refractories were studied. The results showed that the addition of SnO2 could have a great influence on the properties of alumina-magnesia refractory castables. The expansion, apparent porosity and strength of refractories with SnO2 were all more prominent than those of reference samples, which were attributed to the formation of CA6 and enhanced bonding. Meanwhile SnO2 could react with spinel and CA6 to form solid solution.展开更多
基金Project supported by the National Natural Science Foundation of China(U20A20239,U21A2057)the Key Research and Development Project of Hubei Province(2021BAD002)。
文摘MgO-CaO ceramics with enhanced microhardness and hydration resistance were successfully prepared by doping Y_(2)O_(3)in this work.The effects of introducing Y_(2)O_(3)on the microstructure and properties of MgO-CaO ceramics were investigated.The microstructural regulation effects of Y_(2)O_(3)additive on MgO,CaO,and MgO-CaO ceramics were analyzed comparatively.The results show that Y_(2)O_(3)dissolves into the CaO lattice to form solid solution in CaO ceramics,and no obvious intergranular phase forms.While the Y_(2)O_(3)additive leads to the micro structural reconstruction in MgO and MgO-CaO ceramics.By adding Y_(2)O_(3),SiO_(2)impurity from magnesium source reacts with CaO to form the silicate phases containing Y^(3+)ions in MgO-CaO ceramics.The increase in the MgO/CaO interface and the microstructural reconstruction synergistically improves the microhardness and hydration resistance of MgO-CaO ceramics markedly.
文摘The slag-resistance and microstructural changes after the slag tests of MgAlON spinel containing different amount of nitrogenwere studied by means of crucible slag-resistant experiment, SEM and EDS in the work. The results show that the slag-resistance ofMgAlON is dependent on the nitrogen content, and the optimum amount is 2.88%. The strUcture is not changed although the grains havebeen permeated by some silicon, calcium and iron. A glass phase which contained nitrogen formed in the metaInorphic layeL The glasscan driprove the ability of the slag-resistance of MgAlON because of its higher viscosity.
文摘Alumina-magnesia refractory castables have been widely used in the wall and bottom impact pad of steel ladles. The properties of alumina-magnesia refractory castables with SnO2 additive in 0 - 5 wt% range were investigated. The phase composition, microstructure, physical and mechanical properties of these refractories were studied. The results showed that the addition of SnO2 could have a great influence on the properties of alumina-magnesia refractory castables. The expansion, apparent porosity and strength of refractories with SnO2 were all more prominent than those of reference samples, which were attributed to the formation of CA6 and enhanced bonding. Meanwhile SnO2 could react with spinel and CA6 to form solid solution.
