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

The invention discloses an acid non-cyanide cadmium-plating additive, preparation of a plating solution and an electro-plating process. The plating solution comprises the following components: 35-40 g / L of cadmium chloride, 140-180 g / L of potassium chloride, 120-160 g / L of a complexing agent, 1.5-2.5 mL / L of a brightener, and 25-35 mL / L of an auxiliary agent. Electro-plating operation conditions comprise that the plating bath temperature is 15-35 DEG C, the negative electrode current density is 0.5-1.5 A / dm<2>, the area ratio of a negative electrode to a positive electrode is 2 to 1, and the positive electrode comprises two materials of a cadmium plate and an electro-plating high-density graphite plate. The advantages mainly comprise that a brightener and an auxiliary agent are prepared by adopting a high-performance electro-plating additive intermediate, the combined complexing agent and cadmium ions are used for generating polybasic complex ions, and the performance of the plating solution and the performance of a plating layer are improved; the plating solution of the process is stable and is easy to maintain, the current efficiency is relatively high, the deep plating ability is strong, the brittleness of the plating layer is small, the corrosion resistance is good, various properties meet requirements of the Ministry of Astronautics Industry standards QJ 453-1988 ''cadmium plating layer technology conditions'', and electroplating wastewater treatment results meet requirements of GB 21900-2008 ''electroplating pollutant discharge standards'' table 3.

The invention relates to a device and method for continuously manufacturing metal powder through multi-electrode plasma arcs. The device and method are characterized in that raw material rods enter a plasma arc generator electrode inner cavity of a heating area through a feeding opening in a feeding device; three electrodes of the plasma arcs are used for evaporating the metal raw material rods into fogging plasma bodies, namely, rods, wires or ceramic rods with the same powder materials are manufactured, wherein the raw material rods are located in the center, and the arcs are located on the periphery; and inert gas flow is used for blowing fogging metal fog into a collecting device, and the fogging metal fog is rapidly cooled and solidifies into powder along with rapid reduction of the temperature and the air pressure. Convenience is brought to mechanized production, and the powder manufacturing cost is greatly reduced. Through adjustment of parameters such as the plasma arc output heat and the protection gas pressure, the powder granularity can range from 0.1 micrometer to 100 micrometers. One-time molding of powder manufacturing is achieved.

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.

The invention discloses a high-calcium no-silicon aluminum-calcium-magnesium-ferric alloy used for steelmaking deoxidization. According to the weight proportion of the components, Ca is more than 15 percent but less than or equal to 28 percent, the proportion of Al to Ca is 1-2:1, 2-6 percent of Mg, the rest is Fe. The optimization scope is 18-25 percent of Ca, the proportion of Al to Ca is 1-1.3:1, 2-4 percent of Mg, the rest is Fe. A preparation method is that: aluminum, calcium, magnesium, low-carbon steel scrap are chosen as raw materials; the materials are smelted into aluminum-magnesium and aluminum-calcium master alloys in a low-frequency furnace; the materials continue being smelted in a high-frequency furnace and aluminum-iron metal liquid is obtained; the master alloy is pressed into the deep of the aluminum-iron metal liquid under a meshed high-temperature resistance container to be melted and at last the master alloy is cast under the protection of argon gas. The obtained alloy can be used for the final deoxidation in smelting low-carbon low-silicon al-killed steel, and can lower the harmful effect of the deoxidation product Al2O3 with good effect in integral deoxidation.

The invention relates to a preparing method for an AuAgCu alloy cast ingot. The preparing method comprises the following steps that firstly, AuAg intermediate alloy cast ingot preparing is conducted;secondly, the surface defects of an AuAg intermediate alloy cast ingot are removed, a strip is prepared through rolling, after the strip is shorn into sheets, thorough cleaning and airing are conducted, and AuAg intermediate alloy sheets are obtained; thirdly, Au and oxygen-free Cu are arranged in an aluminum oxide crucible of a vacuum medium-frequency induction smelting furnace, the AuAg intermediate alloy sheets are placed in a charging hopper of the vacuum medium-frequency induction smelting furnace, smelting and casting forming is conducted, and the AuAgCu alloy cast ingot is obtained. Bymeans of the preparing method, the quality of the AuAgCu alloy cast ingot is obviously improved, and the problem about segregation of the rich Cu phase and the rich Ag phase due to component segregation of structures of the AuAgCu alloy cast ingot is solved; and the defects of internal shrinkage, air holes, inclusions and the like of the cast ingot are reduced, and AuAgCu plates and strips excellent in quality and high in yield can be better machined in the later period.

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.