3 results about "Cobalt base alloy" patented technology

The invention relates to the technical field of coating materials, and particularly discloses a metallurgical strengthening preparation process of a wear-resistant coating of a high-stress valve ball. Comprising the following steps that S1, a porous structure supporting layer is prepared, specifically, cobalt-based alloy powder and a pore forming agent are mixed according to the mass ratio of (85-92): (8-15), and a porous middle layer is formed on the surface of a sphere base body through sintering; s2, coating slurry is injected; s3, sintering is carried out; s4, carrying out laser micro-texture treatment; s5, embedding a solid lubricant; s6, performing hot isostatic pressing densification; and S7, vibration auxiliary polishing is conducted. The metallurgical strengthening preparation process for the wear-resistant coating of the high-stress valve ball can be used for surface strengthening treatment of high-parameter valve core ball parts in the fields of petrochemical engineering, electrical energy, aerospace and the like, and has the advantages of high bonding strength between the coating and a matrix, excellent high-temperature wear resistance and thermal shock resistance, stable friction coefficient, long service life, high wear resistance and the like. And the method has the advantages of high process adaptability and low bonding failure risk.

The invention relates to a cobalt superalloy having (in % by weight): carbon (C): 0.04%-0.05%; chromium (Cr): 21.0%-23.0%; tungsten (W): 7.2%-8.2%; titanium (Ti): 0.05%-0.14%; aluminum (Al): 1.7%-2.7%; tantalum (Ta): 2.9%-3.6%; yttrium (Y): 0.01%-0.03%; nickel (Ni): 11.5% bis 13.5%; hafnium (Hf): 0.45%-0.65%; cobalt (Co): 49.0%-53.0%; zirconium (Zr): up to 0.02%; boron (B): up to 0.0014%; silicon (Si): up to 0.018%.

The utility model discloses a special welding rod for a die-casting die, which relates to the technical field of welding rods, and comprises a core material and a plurality of layers of composite coatings sequentially coated from inside to outside, and the plurality of layers of composite coatings are composed of a bonding layer, a functional alloy layer and a surface treatment layer. Wherein the bonding layer is metallurgically bonded with the core material through a metal dendritic crystal structure, the interface bonding force is enhanced, and the problem that the compactness of a welding layer is reduced due to coating stripping of a traditional welding rod is solved; the functional alloy layer is of a wave-shaped interface structure formed by alternately stacking nickel-based alloy and cobalt-based alloy, tungsten carbide particle strengthening and honeycomb pore energy absorption design are combined, thermal stress is dispersed, and the thermal fatigue resistance is improved. The surface treatment layer is filled with rare earth oxide and laser micro-melting concave-convex lines through spiral micro-grooves, the molten pool fluidity and the heat conduction efficiency are optimized, and the welding defects are reduced. According to the welding rod, through multi-layer collaborative design, the problems that the tensile strength is insufficient, and high-temperature cracks are prone to occurring in the die-casting die repairing process are solved.