54results about How to "Reduce cobalt content" patented technology

Steel characterized in that its composition is, in percentages by weight: - C = 0.20 - 0.30%; - Co = traces - 1%; - Cr = 2 - 5%; - Al = 1 - 2%; - Mo + W / 2 = 1 - 4%; - V = traces - 0.3%; - Nb = traces - 0.1%; - B = traces - 30 ppm; - Ni = 11 - 16% with Ni = 7 + 3.5 Al; - Si = traces - 1.0%; - Mn = traces - 2.0%; - Ca = traces - 20 ppm; - rare earths = traces - 100 ppm; - when N < 10 ppm, Ti + Zr / 2 = traces - 100 ppm with Ti + Zr / 2 < 10 N; - when 10 ppm < N < 20 ppm, Ti + Zr / 2 = traces - 150 ppm; - O = traces - 50 ppm; - N = traces - 20 ppm; - S = traces - 20 ppm; - Cu = traces - 1%; - P = traces - 200 ppm, the remainder being iron and inevitable impurities resulting from the smelting. Process for manufacturing a part from this steel, and part thus obtained.

The invention provides a tungsten carbide based cemented carbide powder metallurgical material and method for preparation, wherein the the constituents (by weight percentage) include WC 86-95%, Co 4-8%, Al 1-3%, TiC 0-2%, and VC 0-2%. The preparing process consists of pre-grinding, mixing, ball-grinding, and finally consolidating through electric current flash sintering method.

The invention relates to the field of composite diamond segments and discloses an electrolyte for cobalt removal, a surface modification method for a composite diamond segment and the composite diamond segment. The electrolyte comprises pyrophosphate, ammonium sulfide, sodium chloride and water. When the electrolyte is utilized to perform surface modification on a diamond layer of the composite diamond segment, the content of cobalt in the diamond layer of the composite diamond segment is less than 1.2% by weight, and the cobalt removal depth can reach 0.7-0.8 mm.

A multi-head cemented carbide composite column tooth and a preparation method thereof, wherein the cemented carbide composite column tooth is designed into a tooth head and a tooth body in the height direction, the tooth head includes 2 to 3 tooth heads, and the tooth head It is axisymmetrically distributed, including the steps: Step 1: Prepare the tooth body raw material and the tooth head raw material; the tooth head includes 10~20wt% carbonized spherical cast tungsten carbide particles, 1~7wt% wax-based composite molding agent, and the balance is Tooth material. Step 2: Inject the tooth head raw material and the tooth body raw material into the mold respectively through a co-injection molding method to obtain a soft cylindrical tooth blank with a composite structure. Step 3: Carrying out high-temperature and low-pressure sintering on the soft billet of the column tooth with a composite structure, the metallurgical reaction at the bonding interface of the tooth head and the tooth body forms a transition layer, and integrally forms a cemented carbide composite column tooth with multiple tooth heads. It solves the technical problem that the existing cemented carbide column tooth cannot take into account both wear resistance and toughness at the same time, and significantly improves the wear resistance and rock breaking efficiency of the column tooth, thereby improving the service life and drilling speed of the drilling tool.

The present invention relates to a nickel-free ferrous tin-cobalt alloy plating solution and a process for utilizing the plating solution for electroplating. The plating solution comprises the following compositions: 0.2 to 6 g / L of tin, 0.6 to 4 g / L of cobalt, 8 to 180 g / L of complexant, 2 to 20 g / L of melanizing agent and 50 to 320 g / L of pH buffer. The parameters of the plating solution are as follows: the Baume of the plating solution is between 10 and 25 baume degrees; the temperature is between 28 and 48 DEG C; and the pH is between 10 and 13. The coating of the nickel-free ferrous tin-cobalt alloy plating solution is an alloy layer taking the tin as a main material, and a small amount of cobalt is added into the coating to form a binary alloy system; the cobalt content in a general ferrous tin-cobalt alloy plating solution exceeds 8 g / L, but the novel electroplating process can reduce the cobalt content to 0.8 g / L; and due to adoption of the special biodegradable stable complexant and the special biodegradable pH buffer, the production cost can be reduced, novel EU standards can be reached simultaneously, and various problems of the prior ferrous tin-cobalt alloy plating solution and the prior process can be solved.