Hi, welcome to alldeaf.com... AllDeaf used to have chat (IRC) but, it was discontinued some years ago.
You could try DeafZone.com - they have IRC. I do not know of any more, but members here like Boult probably can be more of help in recommending you to several IRC for the deaf.
EDITED: If you are interested in non-IRC chat for the deaf - try DeafChat.com.