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| Influence of Al powder content on the performance of auto Al2O3 hot-pressing
injection molding core |
| LI Yang，DU Shaojie |
| School of Automotive Engineering，Huanghe Jiaotong University，Jiaozuo 454950，China |
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Abstract The Al powder was selected as Al2O3 powder material modifier to test the changes of shrinkage，microstructure
and mechanical properties of Al2O3 powder material under different addition amounts of Al powder. The
results show that the casting shrinkage of the sample changes significantly with the addition of Al powder，in
which the casting shrinkage is the largest in the width and the thickness is the smallest.With the gradual increase of
Al powder content，the bending strength and volume density of Al2O3 powder sample decreases significantly，the
porosity increases significantly，the powder deflection of Al2O3 also increases significantly，the pore diameter of
the casting structure also increases significantly，and the pore diameter of a larger size is formed. With the increase
of the content of Al powder，the intensity of alumina diffraction peak increases. When Al powder is not added，
some large particles are formed at the fracture site，which showes the characteristics of transgranular fracture. The
fracture of the material with Al powder is intergranular fracture.
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Received: 07 February 2019
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2021, Vol. 31 
