Research on the effects of the amount of fillers in the form of fused alumina,mullite,and tabular alumina,zirconium-containing and silica-containing components of the batches in the form of zircon and silica sand on t...Research on the effects of the amount of fillers in the form of fused alumina,mullite,and tabular alumina,zirconium-containing and silica-containing components of the batches in the form of zircon and silica sand on the properties of alumina-zirconia-silicate(AZS)refractories was conducted.It was found that the introduction of 16%zircon into the composition of samples with fillers such as fused alumina and mullite,as well as tabular alumina,results in an increase in their density,strength,and thermal shock resistance.Petrographic studies have revealed the formation of a multiphase,microcracked structure in these samples,which accounts for the improvement in their properties.The optimal composition of a batch containing a filler of tabular alumina,a finely dispersed matrix ofα-alumina,16%zircon,and 7%silica sand has been determined,which ensures the production of AZS refractories with high bulk density,cold crushing strength,and thermal shock resistance.Research on the plastic strength of the structure of optimal composition AZS mass,depending on its storage time,was conducted.It was found that up to 24 h of storage,the mass is characterized by low plastic strength.It indicates its suitability for use in the vibration casting technology of products.Storage of the mass for more than 24 h leads to an increase in the plastic strength of its structure,which reaches a maximum after 56 h of storage.The developed composition of the batch is recommended for the manufacture of AZS crucibles for induction melting of heat-resistant alloys.展开更多
文摘Research on the effects of the amount of fillers in the form of fused alumina,mullite,and tabular alumina,zirconium-containing and silica-containing components of the batches in the form of zircon and silica sand on the properties of alumina-zirconia-silicate(AZS)refractories was conducted.It was found that the introduction of 16%zircon into the composition of samples with fillers such as fused alumina and mullite,as well as tabular alumina,results in an increase in their density,strength,and thermal shock resistance.Petrographic studies have revealed the formation of a multiphase,microcracked structure in these samples,which accounts for the improvement in their properties.The optimal composition of a batch containing a filler of tabular alumina,a finely dispersed matrix ofα-alumina,16%zircon,and 7%silica sand has been determined,which ensures the production of AZS refractories with high bulk density,cold crushing strength,and thermal shock resistance.Research on the plastic strength of the structure of optimal composition AZS mass,depending on its storage time,was conducted.It was found that up to 24 h of storage,the mass is characterized by low plastic strength.It indicates its suitability for use in the vibration casting technology of products.Storage of the mass for more than 24 h leads to an increase in the plastic strength of its structure,which reaches a maximum after 56 h of storage.The developed composition of the batch is recommended for the manufacture of AZS crucibles for induction melting of heat-resistant alloys.
