171 results about "Mg element" patented technology

The invention relates to a high temperature thermistor and a manufacturing method thereof. The high temperature thermistor is formed by barium titanate, lead titanate, calcium titanate, strontium titanate, semi-conducting elements, silicon oxide, titanium oxide, alumina, manganese dioxide and magnesium oxide, wherein the semi-conducting elements are one or more of niobium oxide, yttrium oxide andantimony oxide. The manufacturing method is characterized by adding water to barium titanate, lead titanate and the like in a ball mill and finely grinding the mixture, discharging and drying the ground mixture, presintering the ground mixture for 2h, grinding the ground mixture in the ball mill, adding PVA adhesive solution, pelleting the mixture, forming the mixture through pressing by a tabletpress, sintering the formed material to obtain semi-conducting ceramics, carrying out grinding and spraying the Al electrode, thus obtaining the product. The sintering potential barrier is increased in the sintering process by adding the Mg element, thus ensuring the grains to be fine and uniform and the voltage resistance to be high. The ceramic structure is denser by replacing Ba with Mg, thus being capable of blocking ionic migration in the abominable atmosphere and improving the stability in the strongly abominable atmosphere. The high temperature thermistor can withstand 500V voltage under extremely low oxygen partial pressure by being assembled in a sealed Al pipe.

The present invention provides a modified red mud, a modification method thereof and a catalyst applicable to direct coal liquefaction. The modified red mud comprises FeOOH, and a hydroxide mixture dispersed among FeOOH; wherein content of Fe in FeOOH in the modified red mud is 30wt%-55wt%; and the hydroxide mixture comprises hydroxides of Al, Ca and Mg. Iron in the red mud is converted into hydroxy ferric oxide, and the iron content is controlled within the range of 30wt%-55wt%; the Si and Ti elements in the red mud are removed, while the Al, Ca, and Mg elements are contained and convert into the hydroxides dispersed between FeOOH to play the roles of separation and dispersion, so that the FeOOH has small particle size, large specific surface area and good dispersion. Thereby, the modified red mud has high direct catalytic liquefaction activity on coal.

The invention discloses a production technique of a high-wear-resistance aluminum alloy section. The alloy comprises the following elements in percentage by mass: 12-16% of Si, 4-6% of Mg, 2-3% of Zn, 0.6-1.2% of Mn, 0.4-0.8% of V, 0.3-0.5% of Cr, 0.2-0.3% of Ni, 0.18-0.22% of Ti, 0.1-0.15% of Co, 0.03-0.05% of As, 0.02-0.03% of In, 0.01-0.02% of P, 0.08-0.12% of RE and the balance of Al. By properly enhancing the Mg element content and optimizing the Si/Mg ratio, abundant Mg2Si phases can be generated in the alloy structure, and the hard granules can obviously enhance the wear resistance of the alloy; and small amounts of As, In and RE added into the alloy structure can improve the high-temperature stability of the alloy. The aluminum alloy section has the advantages of high strength, strong high-temperature stability and excellent wear resistance, and can be widely used in industrial wear-resistant parts.

The present invention provides a hydrogen absorbing alloy containing a phase of a Pr₅Co₁₉ type crystal structure having a composition defined by a general formula A_(4−w)B_(1+w)C₁₉ (A denotes one or more element(s) selected from rare earth elements including Y (yttrium); B denotes an Mg element; C denotes one or more element(s) selected from a group consisting of Ni, Co, Mn, and Al; and w denotes a numeral in a range from −0.1 to 0.8) and having a composition as a whole defined by a general formula R1_xR2_yR3_z (15.8≦x≦17.8, 3.4≦y≦5.0, 78.8≦z≦79.6, and x+y+z=100; R1 denotes one or more element(s) selected from rare earth elements including Y (yttrium); R2 denotes an Mg element, R3 denotes one or more element(s) selected from a group consisting of Ni, Co, Mn, and Al; the numeral of Mn+Al in the z is 0.5 or higher; and the numeral of Al in the z is 4.1 or lower).

The invention provides a zinc-based multi-element alloy for hot dipping and a preparation method thereof. The zinc-based multi-element alloy comprises the following components in percentage by mass: 2 to 3 percent of Al, 0.1 to 0.2 percent of RE(LA, Ce and PR mixed rare earth), 0.02 to 0.03 percent of Ni, 0.01 to 0.02 percent of Si, 0.01 to 0.02 percent of Mg, 0.005 to 0.01 percent of Cu and the balance of Zn. The zinc-based multi-element alloy has the advantages that: (1) in the alloy, the Al, Ni, Si, Cu and other elements are reasonably mixed, so the corrosion resistance of a hot-dip coating is obviously improved by over 20 percent than that of a pure zinc coating, meanwhile, the aluminium content is controlled within 3 percent so as to ensure that the alloy has good dip plating performance; and (2) in the alloy, La, Ce, Pr and other rare-earth elements and Mg element are reasonably mixed, so the fluidity and wetting performance of alloy plating solution are further improved, the surface quality of the coating is good, and the metal consumption is reduced by over 20 percent than that of the traditional galvanization. The zinc-based multi-element alloy and the preparation method thereof have obvious advantages in the aspects such as improving performance quality of hot-dip galvanized products, reducing metal consumption and reducing production cost.

The invention relates to a method for compounding an aluminum alloy composite board used for machining an automobile oil cooler bottom board. A 3003 aluminum alloy board, a 6A02 aluminum alloy cast ingot and a 3003 aluminum alloy board are hot-rolled and compounded according to the thickness proportion of 1:(8-15):1, so that the three-layer aluminum alloy composite board is obtained. By the adoption of the aluminum alloy composite board manufactured through the method, the situation that the welding quality of an oil cooler is affected due to the Mg element in a 6A02 core material of the aluminum alloy composite board in the protective atmosphere brazing process is avoided, protective atmosphere brazing of an oil cooler assembling piece can be smoothly finished, the production efficiency of the oil cooler is greatly improved, and the production cost is reduced.

An aluminium alloy strip used for a housing of a mobile phone lithium battery provided by the invention has tensile strength which can reach 170 to 190 MPa, an elongation rate after fracture being 3.0 to 5.0 % and an earing ration being 3 to 4 %, and can meet the requirements of the novel mobile phone battery housing for asymmetric-box-type large-proportion thin stretching and punching forming. A method for preparing the aluminium alloy strip used for the housing of the mobile phone lithium battery enables materials to be uniform in organization and no rough and nonuniform secondphase particles to exist through strictly controlling the mass percent of each alloy element, and treating by homogenizing annealing to eliminate intragranular segregation of Mn element before hot rolling. Due to the addition of a certain amount of Mg element, grain sizes of a finished product can be controlled to be below level one while improving the strength of the materials, so that the comprehensive properties such as material strength, toughness, deep-drawing and the like can be greatly improved.

The invention discloses a preparation method of a high-strength copper alloy wire for an automobile industry. The high-strength copper alloy wire is composed of the flowing elements in percentage by weight: 0.3-0.5% of Fe, 0.2-0.3% of Al, 0.4-0.6% of Sn, 0.2-0.4% of Cr, 0.1-0.2% of Ni, 0.15-0.25% of Be, 0.06-0.12% of Mo, 0.06-0.09% of Nd, 0.04-0.08% of Ta, 0.03-0.06% of Zr, 0.02-0.03% of P and the balance of copper and unavoidable impurities. According to the preparation method, on the basis of ensuring the electrical conductivity and machinability of the copper alloy wire, by increasing the content of a Mg element and adding a small amount of elements such as Nd, Ta and Zr and the like, the mechanical strength of a copper alloy is improved; and the high-strength copper alloy wire has the characteristics of good wear resistance, stress corrosion resistance and high temperature resistance, low cost, good processing performance, good welding performance, and the like.

The invention discloses a low-chlorine value biomass briquette fuel. According to the invention, the pretreated corn straws are taken as a raw material for anaerobic fermentation for 10-20 days, so that mechanical endurance of the briquette fuel is increased, magnesium carbonate is taken as an anti-slagging agent, during a combustion process, the Mg element and elements such as Si, K, and Na which are inherent in the corn straws and are capable of slagging are subjected to a reaction, a novel compound K2Mg(SO4)2 is generated and provides anti-slagging performance to the briquette fuel, and the produced briquette fuel has the advantages of low chlorine value and high combustion value, no harmful gas is discharged after combustion is carried out, and a boiler is not easily corroded.

The invention relates to a method for preparing an LPSO (Long Period stacking ordered) phase enhanced magnesium alloy gradient material, belonging to the field of intermetallic compound preparation technology. The method comprises the steps of firstly, mixing pure magnesium and pure yttrium to prepare an Mg-Y alloy block, and then sequentially overlaying a pure magnesium block, a pure zinc block and the Mg-Y alloy block from bottom to top; simultaneously heating the overlaid metal blocks prepared in the above step and divided into the upper part and the lower part so as to remove vapor, and then introducing a protective gas for melting; after the melting process is completed, stopping the heating to the lower part, introducing cooling water so as to cool the lower part, regulating the heating temperature of the upper part to be below 300 DEG C for one-way cooling, then stopping heating, cooling to room temperature, thus preparing the LPSO phase-enhanced magnesium alloy gradient material. According to the method, the LPSO phase enhanced gradient material can be prepared through upward dispersion of Mg element with lower density and downward settlement of Zn and Y atoms with high density in the one-way cooling process.

The invention relates to a microwave dielectric ceramic with extra-high quality factors, medium-low dielectric constants and near zero temperature coefficients, and a preparation method of the microwave dielectric ceramic. The chemical general formula of a magnesium ditantalum hexaoxide microwave dielectric ceramic is Mg<2.5+x>TaNbO<7.5+x>+y wt%B2O3+z wt% C, wherein x is greater than or equal to 0 and smaller than or equal to 0.2, the weight percentage content y wt% of B2O3 is that y is greater than or equal to 1 and smaller than or equal to 2 on the premise that the weight of the Mg<2.5+x>TaNbO<7.5+x> is 100%, the weight percentage content z wt% of C is that z is greater than or equal to 0 and smaller than or equal to 1 on the premise that the total weight of the Mg<2.5+x>TaNbO<7.5+x> and B2O3 is 100%, and C is at least one of ZnO, CuO, Al2O3, MnO2, WO3, ZrO2 and SnO2. The dielectric constants of the magnesium ditantalum hexaoxide microwave dielectric ceramic are adjusted through an Mg element and a Nb element, and the frequency temperature coefficient can also be correspondingly adjusted.

The invention provides a recognition method of lithology of sand-shale-carbonatite. The method is characterized by comprising the following steps: S1) detecting the content of Si, Al, Ca and Mg elements in a to-be-detected rock debris sample; and S2) calculating the total content XSS of SiO2 and Al2O3 and the total content XLD of CaO and Mgo in the to-be-detected rock debris sample; and judging the lithology of the to-be-detected rock debris sample according to the XSS and the XLD. Compared with the prior art, the method provided by the invention has the beneficial effects that firstly, the content of the Si, Al, Ca and Mg elements in the rock debris sample is detected, and the data of the content of the XSS and the XLD is calculated, so that quick, automatic and accurate recognition of the sand-shale-carbonatite is realized; the defects existing in the prior art are overcome; the method is convenient to operate; a recognition result of the lithology is accurate; and the method is beneficial to the recognition of oil and gas resource reservoirs, can improve the exploration and development benefits of oil and gas resources, and guides safe and efficient well drilling construction.

The invention relates to an inorganic porous ceramic material and a preparation method thereof. The inorganic porous ceramic material is prepared from boron-containing compound, magnesium-containing compound and iron-containing compound, the molar ratio of the Mg element, the Fe element and the B element in the magnesium-containing compound, the iron-containing compound and the boron-containing compound is 1 : (0.10-1.65) : (0.33-1.95), and the inorganic porous ceramic material is obtained by mixing, compression moulding and sintering. The invention has the advantages that (1) the process is simple and the cost is low; (2) the inorganic porous ceramic material can be used as a catalyst carrier, and a gas-solid phase reaction filler and a boron source precursor and can also be used as an adsorbent; (3) when the heat of the inorganic porous ceramic material is preserved for 24 hours at the temperature of 800 DEG C, the maximum weight-loss ratio and the maximum weight gain ratio of the inorganic porous ceramic material are both smaller than 5wt.%, the compression strength is 1.02-2.50 MPa, and the volume density is 1.25-7.50g/cm3.

The invention discloses a measurement method for the content of magnesium and the content of aluminium in a main component of pyrotechnic composition for fireworks and crackers. The measurement method comprises the following steps: (1) taking inductively-coupled plasma emission spectrometer as a detecting instrument, selecting 279.0nm as a characteristic spectral line for detecting Mg element, and selecting 256.7nm or 237.3nm as a characteristic spectral line for detecting Al element; respectively making a Mg-element calibration curve and a Al-element calibration curve; and (2) preparing pyrotechnic composition sample liquid, detecting on a computer, displaying the characteristic spectral intensity on a recording instrument, reading a mass concentration value corresponding to Mg or Al according to the determined calibration curve by the characteristic spectral intensity; and calculating the mass percent concentration of elementary magnesium or aluminium according to the specific formula. The measurement method disclosed by the invention has the advantages that method is simple and the detection period is short; and the characteristic spectral line is adopted for detection by combination with the sample treatment method, the recovery rate is high (99.85%-103.07%) and the precision is high,.