32results about How to "Reduce the amount of inclusions" patented technology

The invention discloses a potassium chloride cyanide-free cadmium titanium alloy plating solution and a preparation method and electroplating process of the potassium chloride cyanide-free cadmium titanium alloy plating solution. The plating solution per liter comprises 20-35g of cadmium chloride, 80-140g of a complexing agent, 120-200g of potassium chloride, 1-5g of sodium fluoride, 2-5mL of a titanium salt supplement, 1-3mL of a brightening agent, 20-40mL of an auxiliary agent and 5-15mL of a displacement agent. According to the electroplating operation conditions, the pH value of the plating solution is 6.5-7.5, plating bath temperature is 20-35 DEG C, the cathode current density is 0.5-2A / dm<2>, and the area ratio of a cathode to an anode is 2:(1-3). The plating solution is stable, convenient to maintain and small in process hydrogen brittleness, and a cadmium titanium alloy coating is excellent in corrosion resistance and good in market prospect.

The invention discloses a vacuum induction smelting method for a high-manganese-content copper-manganese intermediate alloy. The method comprises the steps that firstly, copper and manganese are placed in a crucible of a vacuum induction smelting furnace to be subjected to primary vacuum pumping, and then preheating treatment is conducted; secondly, raw materials obtained after preheating treatment are refined, copper-manganese alloy melt is obtained, and inflation of argon serving as protective gas is conducted for heating; thirdly, the heated copper-manganese alloy melt is cast, and a copper-manganese intermediate alloy cast ingot is formed; and fourthly, the copper-manganese intermediate alloy cast ingot is placed in an aluminum oxide brick or aluminum oxide sand to be subjected to aircooling to the room temperature, and the high-manganese-content copper-manganese intermediate alloy is obtained. According to the method, the vacuum induction smelting furnace is inflated with the high-purity argon in the copper-manganese raw material preheating process, after being exhausted, gas adsorbed to the surfaces of the raw materials including the copper and the manganese is mixed with the argon, accordingly, oxygen partial pressure in the furnace is reduced, the phenomenon of oxidization slagging of the manganese element in the smelting process is avoided, and accordingly, the content of the manganese element in the copper-manganese intermediate alloy is larger than 30% and does not exceed 50%.

The invention discloses a Mo2NiB2 base metal ceramic with a nickel base alloy serving as a binding phase. The Mo2NiB2 base metal ceramic is prepared from multiple of MoB powder, NiB powder, Mo powder, B powder and Ni powder. By weight, 3.5-7 parts of B, 31.5-65 parts of Mo and 28-65 parts of Ni are mixed, and a proper amount of glucose, a proper number of binding agent and a proper number of dispersion medium are added in the mixture. The invention further discloses a preparing method of the Mo2NiB2 base metal ceramic. The preparing method includes the steps that multiple of the MoB powder, the Nib powder, the Mo powder, the B powder and the Ni powder are evenly mixed with the glucose, the binding agent and the dispersion medium to obtain sizing; spray drying and pelletizing are conducted; the powder is treated in the hydrogen atmosphere at the temperature being 900-1100 DEG C; and then the powder is packed into a machined cover to be subjected to hot isostatic pressing, wherein the temperature ranges from 1100 DEG C to 1300 DEG C, and the pressure ranges from 100 MPa to 200 MPa. The prepared Mo2NiB2 base metal ceramic material is small in oxide inclusion amount, high in material strength and high in toughness, and a blank is shrunk evenly and regularly in the hot isostatic pressing process and is not likely to twist or deform.

A processing mechanism for effectively controlling inclusions in nicotine extract steam, including a nicotine extract steamer and a spray chamber, and a nicotine extract steamer including a material inlet, a material outlet, and a steam inlet , a steam outlet and a number of steam trays, the inner chamber of the steam tray is connected with the steam inlet, the nicotine extracts pass through the feed inlet and several steam trays to the outlet in turn, and the evaporated components flow out from the steam outlet; the spray chamber It is provided with a steam inlet, a treated steam outlet and a spray head, and the treated steam outlet is set above the spray head; the steam outlet of the nicotine extraction off-line is connected with the spray chamber, and the steam passes through the steam inlet, spray After showering, it reaches the treated steam outlet. Spray the extracted steam to remove the inclusions. The structure is simple and the removal effect is obvious. At the same time, multiple steam pans are also set to extend the path of steam extraction and reduce the amount of inclusions in the final extraction steam. Effectively control steam inclusions during and after extraction steam generation.

The invention discloses a composite refining method for zirconium-containing magnesium alloy, including the steps of a, adding magnesium ingots in a first heating device and melting the magnesium ingots into molten magnesium; b, adding alloy-element ingots in the molten magnesium to obtain an intermediate magnesium melt; c, adding magnesium-zirconium intermediate alloy in the intermediate magnesium melt, stirring continuously in a stirring device to obtain an alloy melt; d, removing floating slags on the surface of the alloy melt; e, adding a flux for refining into the alloy melt; f, adding gas for refining into the alloy melt through a gas delivery device; g, cooling the alloy melt to the casting temperature. As alloys containing no zirconium alloy and magnesium intermediate alloy are processed respectively, deposited zirconium element particles are returned to the alloy intermediate melt to be molten, and solubility of zirconium in the alloy intermediate melt can be increased, zirconium yield is also increased, while production cost is lowered.

The invention relates to a method for preparing polycarbonate. The method utilizes an interface method, and comprises the steps of: mixing alkaline aqueous solution of one or more dihydroxy aromatic hydrocarbons and organic solution of carbonyl chloride(phosgene); controlling the pH value to be between 9 and 12.5 in the whole process; and performing an interfacial polymerization reaction of a phenol chain terminator, the dihydroxy aromatic hydrocarbons and the phosgene in the presence of a catalyst, namely an amphiphilic block copolymer to prepare the polycarbonate. The method utilizes the amphiphilic block copolymer as the catalyst for preparing the polycarbonate by the interface method, which can increase the utilization rate of the carbonyl chloride, reduce the consumption of the carbonyl chloride, and improve the utilization rate of bisphenol; the catalyst can promote the rapid transformation of chloroformate and obtain a polycarbonate product with low inclusion amount of dihydroxy aromatic compounds; and no phenol precipitations are precipitated after a wastewater phase is acidified, and a catalyst material can be treated and recovered by adopting a conventional method.

The invention discloses a steel for R4-grade mooring cables and a preparation method thereof. The steel comprises the following components in percentage by weight: 0.15-0.24% of C, 0.15-0.30% of Si, 1.2-1.60% of Mn, at most 0.025% of P, at most 0.025% of S, at most 0.02% of Cu, 0.8-1.3% of Cr, 0.70-1.30% of Ni, 0.2-0.50% of Mo, 0.02-0.05% of Al, at most 0.0050% of As, at most 0.0050% of Sb, at most 0.0050% of Sn, at most 0.0050% of N, at most 0.0020% of O, at most 0.0020% of H, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: molten iron desulfurization, converter smelting, argon blowing, LF (ladle furnace) refining, RH vacuum treatment, continuous casting, square billet heating, rolling, air cooling and nondestructive flaw detection. The steel for R4-grade mooring cables has the advantages of high strength, high toughness, low cost and corrosion resistance.