33 results about "Pb element" patented technology

The invention provides a steel-abrasion resisting copper alloy laminar bearing bush material and a preparing device and method thereof. The preparing method of the steel-abrasion resisting copper alloy laminar bearing bush material comprises the following steps that abrasion resisting copper alloy powder is prepared; a steel substrate material is cleaned, and oil dirt and oxide are removed; a steel substrate subjected to high-frequency induction heating is covered with the abrasion resisting copper alloy powder with a certain thickness; the abrasion resisting copper alloy powder and the steel substrate with a certain thickness are heated and melted through a laser under the protection atmosphere, meanwhile, a pulse electromagnetic field is applied above an abrasion resisting copper alloy powder and steel substrate molten bath, the abrasion resisting copper alloy powder and the steel substrate are fused together, and metallurgical bonding is achieved; and the inner stress is eliminated in an online high-frequency heating normalizing manner, and the steel-abrasion resisting copper alloy laminar bearing bush material is prepared. The content of the Pb element in the steel-abrasion resisting copper alloy laminar bearing bush material can be accurately controlled, and segregation of the Pb element is reduced.

The invention discloses an environment-friendly high-strength and easy-to-cut aluminum alloy. The environment-friendly high-strength and easy-to-cut aluminum alloy is prepared from the following components in parts by weight: 0.6 to 1.4 parts of Si, less than or equal to 0.7 part of Fe, 0.2 to 0.5 part of Cu, 0.2 to 1.0 part of Mn, 0.6 to 1.2 parts of Mg, less than or equal to 0.3 part of Cr, 0.5to 1.5 parts of Bi, a single impurity with the content of less than or equal to 0.05 part, less than or equal to 0.15 part of total impurities and the balance of Al. According to the environment-friendly high-strength and easy-to-cut aluminum alloy, Si and Mg elements and Cu element have a strengthening effect in the alloy to improve the mechanical strength of the alloy and refine grain structuresof a material; the Bi element is added to replace a common Pb element (the Pb element belongs to a banned substance control element in environment protection) and has the effect of optimizing alloy cutting performance, so that the material is easily subjected to chip breaking in a machining process and is not wound on a knife. The final tensile strength of the material can reach 400Mpa or more and the material rigidity can reach HB 110 or more.

The invention belongs to the technical field of semiconductor materials, and provides an n-type tin telluride thermoelectric material and a preparation method thereof. The preparation method comprises: combining Sn, Te, Pb and SnI 2 The molar ratio is: (1-x-y), (1-2y), x and y are mixed to obtain a mixed material; the mixed material is put into a quartz tube and vacuumized; the The quartz tube of the mixed material is placed in a heat treatment furnace for synthesis reaction to obtain an n-type SnTe ingot; the n-type SnTe ingot is ground into powder and put into a graphite mold, and the graphite mold containing the n-type SnTe ingot powder Put it into a sintering furnace for sintering to obtain an n-type SnTe sample. The present invention introduces Pb element to make it completely dissolve into the SnTe matrix, thereby making up for intrinsic Sn vacancies, reducing the hole concentration of SnTe, and providing prerequisites for realizing the transformation from p-type to n-type of SnTe. At the same time, I Substituting Te element for electronic doping, and then successfully synthesized n-type SnTe thermoelectric material.

The invention discloses a niobium-boron binary alloy brazing material, and the brazing material comprises the following raw materials by weight percent: 1.5%-5.5% of boron and the balance of niobium and inevitable impurities, wherein the content by weight percent of each of Zn, Cd and Pb elements in the impurities is not greater than 0.001%. The niobium-boron binary alloy brazing material is low in cost and low in steam pressure and can be used in a high-reliability cathode environment of a vacuum electronic device, the melting temperature of the brazing material is 1600 DEG C-1800 DEG C, thebrazing temperature is 1650 DEG C-1900 DEG C, and the niobium-boron binary alloy brazing material is suitable for brazing refractory metals, namely W and Mo and alloys thereof, under an Ar atmosphereor vacuum state; after the brazing material is in brazing connection with the refractory metals, namely the W and the Mo, the wettability and the spreadability are good, the brazing material is good in flowability, strong in gap filling capability and good in high-temperature strength of welding lines; and the steam pressure of the brazing material is lower than 1*10<-5>Pa under the vacuum working condition of a cathode weld assembly at the temperature of 1000 DEG C-1200 DEG C.

The invention provides a method for chemical doping of plumbum (Pb) on the surface of a cathode carbon material used for an ultrabattery. The method comprises two steps of carbon material surface modification and Pb doping. The carbon material surface modification includes that carbon material undergoes a vulcanization reaction and / or an oxidation reaction. The Pb doping includes that the carbon material is placed into a solution containing Pb <2+> to be treated, and a treating mode is at least one chosen from vacuum soaking, ultrasound oscillation and high-temperature backflow. The method is simple and convenient to operate, achieves deep, uniform and mass doping of Pb elements in a microcosmic area of the carbon material by means of strong affinity of S and O to Pb and C, restrains hydrogen evolution of the carbon material under an acid-stage system, improves the volume of the carbon material, and enables the level of the hydrogen evolution of the surface of the carbon material under the acid-stage system corresponds to be equal to that of the surface of Pb. The method is suitable for industrialization application.

The invention discloses a Cu-Cr alloy containing trace Pb elements and a solidification preparation method thereof, and belongs to the technical field of the Cu-Cr alloy preparation. The trace elements Pb are added into the Cu-Cr alloy, a nucleation rate of Cr-enriched rich phase liquid drops during a liquid-liquid phase change in a cooling process of Cu-Cr alloy melt is improved, and the formation of a diffuse-type Cu-Cr alloy compound solidification structure is promoted. The method can be used for preparing a Cu-Cr alloy material of a Cu-enriched matrix in which rich Cr particles are diffused and distributed.

The invention discloses a method and device for depositing disperse tin and zinc crystal nucleuses on the surface of highly pure aluminum foil for medium and high voltage anodes in a mist spraying mode. The method includes the following steps that recrystallization annealing treatment is carried out on the rolled aluminum foil, the highly pure aluminum foil for medium and high voltage anodes is formed, the {100} surface texture occupancy of the highly pure aluminum foil is larger than 95 percent, Mn, Fe, Co, Ni, Cu, Zn, Cd, Ga, Ge, In, Sn and Pb elements of which the electrode levels are higher than that of Al are not rich on the surface of the highly pure aluminum foil, and the purity of Al is more than 99.99 percent; an oxidation film on the surface is removed through an alkali wash pre-treatment method; aluminum foil with the surface covered with a pre-treatment alkali wash film is arranged in a mist box formed by ultrasonic spraying mist to deposit disperse tin and zinc crystal nucleuses. When the highly pure aluminum foil for medium and high voltage anodes with the surface deposited with the tin and zinc crystal nucleuses is adopted, the tin and zinc crystal nucleuses can effectively guide corrosion poring of the aluminum foil in the electrolytic corrosion process, distribution uniformity of channel holes is improved, self-corrosion thinning of the aluminum foil is reduced, and therefore the specific capacitance and bending resistance of the aluminum foil can be obviously improved.

The invention discloses a method for sintering PZT piezoelectric ceramics at low temperature and piezoelectric ceramics. The method comprises the following steps: putting PZT coarse powder synthesized by a solid phase method into deionized water, adding an appropriate amount of dispersant, and stirring evenly; Add lead nitrate, zirconium oxynitrate, and titanyl nitrate solutions in proportion to the water of the above-mentioned uniformly dispersed PZT powder, and stir evenly; while stirring, add ammonia water dropwise, so that Pb, Zr, and Ti ions are simultaneously precipitated on the surface of the PZT coarse powder, Form the PZT coating powder precipitation, continue to stir for a period of time after the ammonia water is added dropwise; filter, collect the sediment, wash it with water, and dry it; add an appropriate amount of binder to the dried PZT coating powder, pressurize Granulating and passing through a 40-60 mesh sieve to obtain a granulated PZT-coated powder; dry pressing the granulated PZT-coated powder, and sintering in a muffle furnace at 1100-1200°C for 1.5-2.5 hours to obtain PZT piezoelectric ceramics; the sintering temperature of the method is low, the volatilization of lead element is less during the sintering process, and the composition ratio of the finished product is close to the original designed formula.

The invention relates to a rare-earth red light-emitting material for converting purple light LED into white light and a preparation process thereof, which belong to the technical field of light emission and display and relate to a red light-emitting material and the preparation process thereof. The structural formula of the red light-emitting material includes M4-3a-3b-2c (MoO4) 2: RaRbNc, wherein the M is an alkali metal Li element, the Ra is a rare-earth activator Eu element, the Rb is a rare-earth sensitizer Tb element, and the Nc is a metal sensitizer Pb element. Materials of the structural formula M4-3a-3b-2c (MoO4) 2: RaRbNc are weighed according to percentage by weight; the weighed materials after being grinded and mixed evenly are placed into an aluminum trioxide crucible and sintered for 1-2 hours in a 400-600 DEG C high-temperature furnace; after being cooled, the materials are fetched out, pulverized, placed into the crucible again and sintered for 2-3 hours in 700-1000 DEG C air atmosphere in the high-temperature furnace; after being cooled, the materials are fetched out and pulverized again, and crystalline powders are obtained and can emit bright red light by stimulation of 365 nanometers and a purple light LED. After the crystalline powders are mixed with rare-earth light-emitting materials emitting green and blue light according to a certain proportion, white light can be emitted by coating the crystalline powders onto a purple light LED tube core.