[hwillis]

It would probably not be very good at cutting, and would just get very hot. Just because the blade doesn't wear away doesn't make it good at cutting.

One way to make something resist abrasives is for it to be/sustain very high temperatures. If you can survive a hotter temperature than the abrasive (quite low for diamond, higher for sapphire) then it will be much less effective.

[taneq]

Pretty sure once this new material gets hot enough the aluminium substrate will melt and it'll cut just as well as anything else.

[hwillis]

You'd need direct heating, a conventional blade still would not work. The alumina spheres hold off the cutting edges and block heat flow from hotspots. A small amount of aluminum foam will melt, but once it's far enough away from the hot zone it'll just serve to conduct heat away from the ceramic much more rapidly than it otherwise would.