NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method
An alloy and thin-walled technology, which is applied in the field of precision forming of intermetallic compound thin-walled pipe fittings, can solve problems such as many defects in superplastic forming, difficult pipe rolling process, and complicated welded pipe process, so as to achieve good composition uniformity and improve dimensional accuracy , The effect of the safety of the preparation process
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[0064] Example 1
[0065] An integrated method for forming and controlling NiAl alloy thin-walled pipe fittings includes the following steps:
[0066] (1) Calculate the thickness ratio of Ni foil and Al foil according to the ratio of the number of Ni atoms to Al atoms in NiAl alloy; polish the Ni foil and Al foil with fine sandpaper, and then put them in an acetone solution for ultrasonic After cleaning, soak in distilled water for 1 min, take it out and blow dry with cold air to obtain pretreated Ni foil and pretreated Al foil; the specific calculation process of the thickness ratio of the Ni foil and Al foil is:
[0067] N=n×N A (I); Among them, N represents the number of atoms, n represents the amount of substance, N A Represents the Avogadro number;
[0068] m=n×M(II), where m is the mass, n is the amount of the substance, and M is the molar mass of the substance;
[0069] h=m / (ρ·S)(III), where h represents height, m represents mass, ρ represents density, and S represents cross-s...
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[0075] Example 2
[0076] An integrated method for forming and controlling NiAl alloy thin-walled pipe fittings includes the following steps:
[0077] (1) Same as embodiment 1;
[0078] (2) Stacking several pre-treated Ni foils and several pre-treated Al foils alternately to obtain a Ni / Al laminated foil; roll the Ni / Al laminated foil into a tube, and place it on the Ni / Al laminated foil tube Insert a metal shaft tube inside, and apply boron nitride solder resist between the Ni / Al laminated foil tube and the metal shaft tube, and put the Ni / Al laminated foil tube and the metal shaft tube into a cylindrical cavity mold as a whole The temperature of the expansion is 400℃, the gas pressure of the expansion is 20MPa, and the time of expansion is 0.5h; then the Ni / Al laminated foil tube and the metal shaft tube are taken out as a whole, and the internal Take out the metal shaft tube;
[0079] (3) The Ni / Al laminated foil tube is placed in an inflatable forming mold, and the inflatable fo...
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