Study on the effect of boron carbide on the performance of silicon-based ceramic cores
The specific effect of boron carbide on the properties of silicon-based ceramic cores
Shrinkage rate and bulk density:
With the increase of boron carbide content, the shrinkage rate and bulk density of silicon-based ceramic cores gradually increase. This may be due to the addition of boron carbide enhancing the density of the material, causing it to shrink more tightly during sintering, thereby increasing the bulk density.
Pore porosity:
With the increase of boron carbide content, the porosity of silicon-based ceramic cores gradually decreases. The reduction of porosity helps to improve the mechanical properties and thermal stability of materials.
Bending strength:
The room temperature bending strength and high temperature bending strength both increase first and then decrease with the increase of boron carbide content. When the boron carbide content reaches a specific value (such as 0.3 wt.%), the bending strength of the silicon-based ceramic core reaches its maximum value.
High temperature deflection:
The high-temperature deflection decreases first and then increases with the increase of boron carbide content. A smaller deflection means that the material has better resistance to deformation at high temperatures.