Method for surface-modifying titanium alloy
AssigneeSouthwest Jiaotong University
InventorsGuodong Cui, Dazhi Chen, Chengsong Zhang
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for surface-modifying titanium alloy, comprising the following steps: carburizing titanium alloy in solid carburizing agent A and solid carburizing agent B, and then performing gas co-infiltration to realize surface modification treatment of titanium alloy; the solid carburizing agent A includes raw materials of charcoal powder a, barium carbonate, calcium carbonate, barium acetate, urea and cerium carbonate, and the solid carburizing agent B includes raw materials of charcoal powder b, barium carbonate, calcium carbonate and cerium carbonate; and the gases used in the gas co-infiltration are ammonia, air and acetylene.
Claims5
A method for surface-modifying titanium alloy, wherein titanium alloy is carburized in solid carburizing agent A and solid carburizing agent B, followed by gas co-infiltration to achieve surface modification of titanium alloy;
- wherein the solid carburizing agent A includes raw materials of charcoal powder a, barium carbonate, calcium carbonate, barium acetate, urea and cerium carbonate;
- wherein the solid carburizing agent B includes raw materials of charcoal powder b, barium carbonate, calcium carbonate and cerium carbonate;
- wherein the gas co-infiltration uses gases of ammonia, air and acetylene;
- wherein the charcoal powder a has a particle size in a range of 0.5-1 millimeter (mm), and the charcoal powder b has a particle size in a range of 1-3 mm;
- the titanium alloy is an alpha+beta (TC) or a beta (TB) titanium alloy;
- specifically comprising the following steps:
- (1) covering the surface of the titanium alloy with solid carburizing agent A after a primary sandblasting treatment, followed by covering with solid carburizing agent B;
- carrying out carburizing treatment to the titanium alloy and then transferring the treated titanium alloy to water for cooling to 20 to 40 degree Celsius (° C.);
- and
- (2) carrying out gas co-infiltration treatment on the titanium alloy treated by step (1) after secondary sandblasting treatment and air-cooling the co-infiltrated titanium alloy to 20-40° C.;
- wherein the solid carburizing agent A includes raw materials according to the following dosages by mass fraction:
- charcoal powder a:
- 80-82 percent (%) by mass fraction;
- barium carbonate:
- 8-10% by mass fraction;
- calcium carbonate:
- 3-5% by mass fraction;
- barium acetate:
- 2% by mass fraction;
- urea:
- 2% by mass fraction;
- cerium carbonate:
- 1% by mass fraction;
- wherein the solid carburizing agent B includes raw materials according to the following dosage by mass fraction:
- charcoal powder b:
- 84-86% by mass;
- barium carbonate:
- 8-10%;
- calcium carbonate:
- 3-5%;
- cerium carbonate:
- 1%.
Dependencies are inferred from the claim text.