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UltraHard Materials Limited

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Comparing UHM’s CeTZP with Silicon Nitride

Silicon Nitride is probably the most common engineering ceramic that is currently being used in applications where a higher performance material is required despite its low fracture toughness.

Table 8

Table 8 lists the mechanical properties of UHM’s CeTZP compared to Silicon Nitride (from references 4,5,7,15).

^#estimated from bend strength

⁺ higher values can be obtained when lower indenter loads are used during Vickers hardness measurements (reference 10).

[All our mechanical tests were carried out on UHM's CeTZP billets.  A LECO test machine for our indentation macrohardness tests utilized 30 kg loads; K1c values were calculated from crack lengths derived from these indentation tests using the equation of Anstis el alia (reference 10)]

UHM’s CeTZP engineering ceramic has some clear mechanical property advantages over Silicon Nitride and they are:

• The fracture toughness of UHM’s CeTZP is about three times (or 300%) higher than Silicon Nitride. This means that UHM’s CeTZP is less likely to fracture under higher load-bearing conditions than Silicon Nitride
   

• The Bend Strength of UHM’s CeTZP is higher than that of Silicon Nitride

Table 9

Table 9 lists the thermal properties of CeTZP compared to Silicon Nitride (from references 4,5,7,15)

CeTZP engineering ceramic has some thermal property advantages over Silicon Nitride and they are:

• The thermal expansion coefficient of CeTZP is comparable to that of cast iron (Silicon Nitride has a much lower thermal expansion coefficient which would make Silicon Nitride a mismatch with cast iron)
   

• CeTZP has a lower thermal conductivity than Silicon Nitride. Thus, CeTZP is a better candidate material than Silicon Nitride for heat engines.

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