I would second that advice - we've had good luck with a "Home made" bonder.

One good heater product we've used is mica insulated disk heater made by
MINCO, good up to about 600C.  The link is:
http://www.minco.com/products/heaters.aspx?id=75
Use a variable transformer to control the temperature.

David Nemeth
Senior Engineer
Sophia Wireless, Inc.