32results about How to "Improve alkali corrosion resistance" patented technology

The invention discloses a high-wear-resistance Guimo brick and a preparation method thereof, belonging to the field of refractory materials. The high-wear-resistance Guimo brick is prepared from the following components in percentage by weight: 20-30% of bauxite with the particle size of smaller than 0.1mm, 5-15% of bauxite with the particle size of greater than or equal to 0.1mm and smaller than 1mm, 30-40% of bauxite with the particle size of greater than or equal to 1mm and smaller than 3mm, 5-8% of bauxite with the particle size of greater than or equal to 3mm, 15-20% of silicon carbide, 2-4% of alpha-Al2O3 micropowder, 3-4% of silicon micropowder and 3-5% of nano metal aluminum powder. The preparation method comprises the following steps: slurry making, forming, drying and firing. The high-wear-resistance Guimo brick has the advantages of balanced particle size proportion, compact structure, high bonding strength and firing strength, excellent wear resistance, favorable thermal shock resistance, low heat conductivity, high refractoriness under load and long service life.

The invention discloses an aluminum alloy for heat exchange and a production method thereof, and belongs to the technical field of light alloy materials. The aluminum alloy is prepared from, by weight, not larger than 0.015%, not larger than 0.015% of Fe, not larger than 0.005% of Cu, 0.95% to 1.05% of Mg, 0.25% to 0.35% of Mn, 0.05% to 0.12% of Sn, 0.05% to 0.15% of Zr, 0.10% to 0.20% of Er, 0.05% to 0.10% of La, 0.10% to 0.15% of Ce and the balance Al and inevitable impurities. Smelting is carried out through a vacuum intermediate frequency coreless induction furnace, secondary foamed ceramic filtering is carried out under argon pressure maintaining, and the aluminum alloy is continuously cast and extruded into a needed heat exchange pipe with a 90-degree wrap angle in a quantitative CASTEX manner. The problem that due to the fact that metal ions of Cu, Cr, Zn, Ni, Ag, Hg, Pb, Co and other elements are contained in an existing aluminum alloy for a heat exchanger and complexly react with ammonia, the aluminum alloy cannot be applied to the heat exchanger with ammonia as a refrigerant is solved. The aluminum alloy has good corrosion resistance, plasticity and breaking tenacity, high thermal conductivity, long-term heat resistance and other properties. The aluminum alloy is widely used for industrial refrigeration with ammonia as the refrigerant, waste heat utilization, air conditioning, chemical industry, heat-pump water heaters and other heat exchangers.

The invention provides a wear-resisting aluminum alloy. The wear-resisting aluminum alloy is composed of the following elements of, by mass, 8-12% of silicon, 1.5-3.5% of copper, 2-4% of magnesium, 0.5-0.7% of zinc, 0.2-1% of boron, 0.5-1.2% of iron, 0.1-0.5% of titanium, 0.4-0.8% of manganese, 0.5-1% of antimony, 0.2-0.38% of osmium, 0.15-0.25% of iridium and the balance aluminum and impurities.All the elements in the wear-resisting aluminum alloy mutually synergistically act, the wear-resisting property and hardness of the aluminum alloy are enhanced, the hardness of the wear-resisting aluminum alloy is 590-610, and the alkali-corrosion-resisting property of the wear-resisting aluminum alloy is also remarkably improved.

The invention relates to the technical field of metal material smelting, in particular to wear-resistant aluminum alloy and a preparation technology thereof. Based on the total quantity of aluminum alloy sections, the wear-resistant aluminum alloy comprises, by weight, 6.18-12.87% of Si, 1.28-3.56% of Zn, 0.89-1.75% of Mn, 0.56-0.95% of Mg, 0.12-0.31% of Ni, 0.03-0.16% of Cu, 0.26-0.48% of Ti, 0.16-0.54% of nitrogen, 0.005-0.12% of microelements, and the balance Al and unavoidable impurities. The silicon-containing high-strength aluminum alloy contains wear-resistant material nitrides, so that the wear resistance of the aluminum alloy is improved. In addition, the nitrides have the characteristics of high hardness and high strength, thus improving the strength and hardness of the aluminum alloy. The wear rate of the wear-resistant aluminum alloy is 0.018-0.029gm-2s-1, the hardness is 95.9-126.9HBW, and the alkali corrosion resistance of the wear-resistant aluminum alloy is significantly improved.

The invention discloses a preparation method of a refractory castable binder for a strong alkali environment. The method uses bauxite as a raw material, and controls the mass fraction of alumina and silicon oxide and the ratio of Al2O3 / SiO2 in the bauxite. Crush the bauxite, grind it so that more than 90% of the particle size passes through a 325-mesh sieve, then mix it with NaOH lye, control the ratio of Na2O / Al2O3, and wet mill for 4 hours to obtain a mixed slurry. Put the mixed slurry into a high-pressure high-temperature reaction kettle, add water to control the density of the slurry to 1.4-1.5g / cm3, and heat at 150°C-180°C for 2-3 hours to obtain a viscous solution. The viscous solution is the binder for refractory castables used in strong alkaline environments. Using the same raw material, the alkali-resistant castable made of this binder has a flexural bond strength of more than 60% higher than that of water glass as a binder after drying at 110°C, and the refractoriness of the castable is 350°C higher than that of water glass castable. Its construction and high temperature performance are obviously better than water glass castables.

The invention discloses a high-wear-resistance Guimo brick and a preparation method thereof, belonging to the field of refractory materials. The high-wear-resistance Guimo brick is prepared from the following components in percentage by weight: 20-30% of bauxite with the particle size of smaller than 0.1mm, 5-15% of bauxite with the particle size of greater than or equal to 0.1mm and smaller than 1mm, 30-40% of bauxite with the particle size of greater than or equal to 1mm and smaller than 3mm, 5-8% of bauxite with the particle size of greater than or equal to 3mm, 15-20% of silicon carbide, 2-4% of alpha-Al2O3 micropowder, 3-4% of silicon micropowder and 3-5% of nano metal aluminum powder. The preparation method comprises the following steps: slurry making, forming, drying and firing. The high-wear-resistance Guimo brick has the advantages of balanced particle size proportion, compact structure, high bonding strength and firing strength, excellent wear resistance, favorable thermal shock resistance, low heat conductivity, high refractoriness under load and long service life.

The invention discloses a coal injection pipe prefabricated member recipe which comprises the following integrities in percentage by weight: 75 to 85 percent of calcium hexaluminate, 5 to 15 percent of silicon carbide, 5 to 10 percent of aluminate cement, trimeric sodium phosphate and 0 to 2 percent of composite additives formed by methylcellulose. The prefabricated member product made by the recipe in the invention can solve the problems of antistripping, wear resistance and the like in the use process.

The invention discloses a wear-resistant aluminum alloy which consists of the following components in percentage by weight: 11-13% of silicon, 4-6% of magnesium, 0.1-0.2% of chromium, 0.2-0.4% of titanium, 0.04-0.08% of manganese, 0.1-0.18% of ytterbium, 0.1-0.15% of tungsten and the balance of aluminum. By adopting the composition, the hardness of the wear-resistant aluminum alloy can be obviously improved by about 30% from about 490 before to about 620, and the alkali corrosion of the obtained alloy is obviously improved.