PRODUCTION OF TiAl INTERMETALLIC COMPOUND WITH COMPOSITE WIRE BY LASER

我们已经尝试生产TiAl and TiNi powder and TiAl and TiNi coating on substrate from compositewire of titanium and aluminium. The composite wire was melted by using CO - d - 22 laser in anatmosphere of nitrogen or argon gas and melted metal was atomized and coated on the SUS304 steel orhigh pressure nitrogen or argon gas at atmosphere and in chamber. Effect of spraycondition on size of powder and porosity of coating layer. Wear resistance of the coating layer wasevaluted by using an hgoshi and Arata wear tester.It was possible to produce TiAl and TiNiintermetallic compound powder and coating layer using a composite wire by a laser reactive spraymethod. The size of powders was in The range from 10μm to 200μm.The coating layer of TiAl wasconsisted of a large amount of TiAl intermetallic conpuond and a small amount of Ti D23 . Thecoating layer TiNi consist of 100% TiNi. As the spray dintance incerased and the atomize gaspressure decreased,the porosity of coating layer decrased. the wear resistance of TiAl and TiNi coating layer increasedby about ten times that of aluminium. The wear resistance of TiNi coating layer by produced inchamber about twenty times that of aluminium。

We have tried to produce TiAl and TiNi powder and TiAl and TiNi coating on substrate from composite wire of titanium and aluminium. The composite wire was melted by using COィイD22ィエD2 laser in an atmosphere of nitrogen or argon gas and melted metal was atomized and coated on the SUS304 steel or aluminium by high pressure nitrogen or argon gas at atmosphere and in chamber. Effect of spray condition on size of powder and porosity of coating layer. Wear resistance of the coating layer was evaluted by using an Ohgoshi and Arata wear tester.It was possible to produce TiAl and TiNi intermetallic compound powder and coating layer using a composite wire by a laser reactive spray method. The size of powders was in the range from 10μm to 200μm.The coating layer of TiAl was consisted of a large amount of TiAl intermetallic conpuond and a small amount of TiィイD23ィエD2Al. The coating layer TiNi was consist of 100% TiNi. As the spray dintance incerased and the atomize gas pressure decreased, the porosity of coating layer decrased. The wear resistance of TiAl and TiNi coating layer increased by about ten times that of aluminium. The wear resistance of TiNi coating layer by produced in chamber about twenty times that of aluminium.