This is what i use on firebrick. It is segmented, and so far has cut through over 50 brick without any signs of wear.
Everyone’s technique is going to be different, but I will say that letting the blade do the work is especially important here. I do apply light pressure on the saw handle to make sure it doesn’t bounce back, and I’m rewarded with a cut that moves steadily through the piece “like butter.”
Hope this helps!