Development for Making Die Tool made of Functionally Gradient Material by Sintering with Chemical Reaction of Composite Powder Metals

Spark plasma sintering with chemical reaction between Copper and Al uminum powders or Ti tanium and Aluminum powders has been tried to develop for making die tool made of a functionally gradient material.As a result，the following conclusions were obtained.1。The manufacturing processes of the functionally gradient material die tool：(A)Mechanical alloying of copper and aluminum powders or titanium and aluminum powders(B)Compaction of the mechanical alloyed powders with gradient mix ratio in a metal die ring(C)Spark plasma sintering with chemical reaction of compacted powder(D)Polishing of the sintered die 2.The sintered part for Cu-33at%Al obtained under the pressure p=30-70 MPa and the temperature 800℃had Vickers hardness HV=757，the compressive fracture stressσ=1.23 Gpa and the relative densityσ=100%，and included some intermetallic compounds of Cu I D 29 I D 2 Al I D 24 I D 2 and CuAl.3。The sintered part for Ti-50at%Al obtained under the pressure p=30-70 MPa and the temperature 850℃had Vickers hardness HV=600，the compressive fracture stressσ=2.5 Gpa and the relative densityρ=100%，and included some intermetallic compounds of TiAl and Ti I D 23锡D2Al.4。The relative density and the Vickers hardness for Ti-Al powders were increasing with the compressive pressure until the temperature 850℃and the values were saturated more than 900℃.5.The higher cylindrical parts until h=20 mm of d=14 mm in diameter were sintered at the temperature 900℃and the pressure p=30 Mpa after compaction under the pressure p=400 Mpa at the room temperature，and the relative densityρ=100%and the Vickers hardness HV=400were obtained.6。The cylindrical parts with different heights were sintered in piles after compaction at the room temperature，and the sufficient denstiyρ=100%was obtained but the Vickers hardness was insufficient.7。The cylindrical tube part for making die tool could sintered successfully.

Spark plasma sintering with chemical reaction between Copper and Al uminum powders or Ti tanium and Aluminum powders has been tried to develop for making die tool made of a functionally gradient material. As a result, the following conclusions were obtained.1. The manufacturing processes of the functionally gradient material die tool: (a) Mechanical alloying of copper and aluminum powders or titanium and aluminum powders (b) Compaction of the mechanical alloyed powders with gradient mix ratio in a metal die ring (c) Spark plasma sintering with chemical reaction of compacted powder (d) Polishing of the sintered die2. The sintered part for Cu-33at%Al obtained under the pressure p=30-70MPa and the temperature 800 ℃ had Vickers hardness HV=757, the compressive fracture stress σ=1.23 Gpa and the relative density σ=100%, and included some intermetallic compounds of CuィイD29ィエD2AlィイD24ィエD2 and CuAl.3. The sintered part for Ti-50at%Al obtained under the pressure p=30-70MPa and the temperature 850 ℃ had Vickers hardness HV=600, the compressive fracture stress σ=2.5 Gpa and the relative density ρ=100%, and included some intermetallic compounds of TiAl and TiィイD23ィエD2Al.4. The relative density and the Vickers hardness for Ti-Al powders were increasing with the compressive pressure until the temperature 850 ℃ and the values were saturated more than 900 ℃.5. The higher cylindrical parts until h=20 mm of d=14 mm in diameter were sintered at the temperature 900 ℃ and the pressure p=30 Mpa after compaction under the pressure p=400 Mpa at the room temperature, and the relative density ρ =100 % and the Vickers hardness HV=400 were obtained.6. The cylindrical parts with different heights were sintered in piles after compaction at the room temperature, and the sufficient denstiy ρ =100% was obtained but the Vickers hardness was insufficient.7. The cylindrical tube part for making die tool could sintered successfully.