Optimization of the Zirconia Cover Structure for Sintering Furnaces Utilized in Tungsten and Molybdenum Processing
The causes of abnormal damage to the zirconia roof brick utilized in tungsten and molybdenum sintering furnaces are simulated and analyzed in this study using ANSYS software.Furthermore,the structural optimization of the roof brick is explored by simulating the stress field during its operational usage with varying thicknesses and volume densities.The results indicate that the maximum tensile stress experi-enced by the top brick exceeds 27 MPa,significantly surpassing the materials bonding strength,leading to fractures and cracks that reduce its lifespan.Moreover,both bulk density and thickness have a substantial impact on thermal stress during operation.By reducing the bulk density within a range of 3.0～4.6 g/cm3 for the zirconia top brick,it is possible to effectively mitigate thermal stress during its operation.Addition-ally,increasing the current roof brick's bulk density to 3.3 g/cm3 while reducing its thickness to 50 mm results in a maximum thermal stress of only 10.27 MPa during usage,which aligns well with a bending strength of 13.6 MPa and significantly enhances its service life.
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