On this page you will find data from a client who uses Buzz-o-sonic to increase the mean strength of their porous ceramics by 50%. By using Buz-o-sonic, the company was able to achieve this strength increase with minimal development and associated costs. The pass-rate was far higher using Buzz-o-sonic to identify the weaker parts rather than the traditional method of using the relative density.

To protect the privacy of the client, strength ratios are used rather than absolute values. The strength was measured by four-point Modulus-of-Rupture (MOR).



Figure 1: Correlation of torsional frequency and relative density to strength

As can be seen in figure 1 above, the torsional frequency measured by the Buzz-o-sonic nondestructive testing system gave a much better correlation to strength, than the traditional relative density. It was then possible to identify and remove the weaker filters from the production batches. For example, a 50% increase of minimum strength was achieved by scrapping 35% (pass rate = 65%)of the filters with the lowest torsional frequencies. If the relative strength was used as a strength indicator instead, then the scrap rate would have increased significantly to 55% (pass rate = 45%)! See figure 2 below.



Figure 2: Pass rate increased by using Buzz-o-sonic as a strength indicator

As can be seen, the torsional frequency measured by the Buzz-o-sonic nondestructive testing system gave a much better correlation to strength, than the traditional relative density.