74results about How to "Avoid brittle break" patented technology

The invention relates to a preparation method for Al2O3p / Mo alloy. The preparation method for the Al2O3p / Mo alloy comprises the steps that calcination is conducted on ammonium molybdate to prepare MoO3 powder, dry grinding is conducted, and the MoO3 powder is prepared to be used; soluble aluminum salt and urea are taken as raw materials, and A1OOH nano particle turbid liquid is prepared through a hydrothermal reaction; the A1OOH nano particle turbid liquid and the dry-grinded MoO3 powder are taken according to proportioning to conduct wet-grinding, drying is conducted, and composite powder is prepared; reduction is conducted on the composite powder at a hydrogen atmosphere, and composite molybdenum powder is obtained; and the composite molybdenum powder is subjected to pressing and sintering, and molybdenum alloy is prepared. According to the preparation method for the A12O3p / Mo alloy, the composite powder is prepared by adopting solid-liquid adulteration and combining ball-milling, the adulteration efficiency is high, the adulteration effect is good, the quality and the stability of the composite powder are good, and the composite powder is easy to collect, and suitable for mass production; and then the molybdenum alloy is prepared through hydrogen reduction, pressing and sintering, ceramic phase A12O3 nano particles are highly dispersed and distributed in a molybdenum matrix, and the wear resistance performance and the anti-electric-arc-erosion performance of the molybdenum alloy are improved.

The invention discloses a high-strength atmospheric-corrosion-resistant steel bar and a preparation method thereof, and belongs to the technical field of steel preparation. According to the preparation method, the problems that in the prior art, high-priced ore concentrates are adopted in the alloy preparation process, iron is wasted in the preparation process and the whole preparation process ofthe high-strength atmospheric-corrosion-resistant steel bar is tedious and high in cost are solved. The preparation method comprises the following steps that 1, marine sand ore, copper slag and coal powder are pretreated and uniformly mixed, so that a raw material mixture is obtained; 2, hydrated lime flux and a syrup additive are added into the raw material mixture, so that a to-be-reduced material is obtained; 3, the to-be-reduced material is pressed into a ball and dried, so that a pellet is obtained; 4, reduction and posttreatment are carried out on the pellet, so that a vanadium-titanium-copper-iron alloy is obtained; and 5, molten steel smelting is carried out through a converter or an electric furnace, the vanadium-titanium-copper-iron alloy and ferrophosphorus are added in the tapping process of molten steel, refining, continuous casting and hot rolling are carried out, so that the high-strength atmospheric-corrosion-resistant steel bar is obtained. The preparation method can be used for preparing the high-strength atmospheric-corrosion-resistant steel bar.