40results about How to "No burning loss" patented technology

The invention discloses a large-size high-niobium high-temperature 706 alloy ingot and its smelting process, which are used to solve the problem of serious burning loss of Al and Ti elements in the existing smelting process and the high-niobium high-temperature 706 alloy ingot easily produced Metallurgical defects of black and white spots. The smelting process includes: vacuum induction smelting, making multiple vacuum induction ingots with the same composition, and then making the same number of electroslag electrodes, using (CaF 2 ‑CaO‑Al 2 o 3 ‑TiO 2 ) quaternary slag, exchange electroslag remelting, and then use the obtained electroslag ingot to make a consumable electrode, and then use the consumable electrode as the starting material to carry out two vacuum consumable remelting. This process can realize the preparation of large-size ingots of high-niobium high-temperature 706 alloys with an ingot weight of more than 15 tons and a diameter of more than 800mm, which can minimize the formation of black spots and white spots and reduce the burning rate of Al and Ti elements.

The invention discloses a technology for producing a CBN (Cubic Boron Nitride) high-speed ceramics grinding wheel, comprising the following steps of: mixing following raw materials in part by weight: 15 to 20 parts of boron anhydrous, 35 to 45 parts of lepidolite, 30 to 40 parts of albite and 5 to 10 parts of Na2CO3; firing at a high temperature; carrying out the ball milling and uniform mixing on nanometer AL2O3 powder, nanometer mullite powder, pre-melted ceramics powder according to the mass ratio of 2:3:5 to obtain the product of binding agent, wherein a grinding material layer comprises 35% of binding agent, 8% of white corundum, 7% of alumina hollow ball and 50% of CNB, an intermediate layer comprises 35% of binding agent and 65% of ceramics balls of 150 meshes; after equably mixing the materials, adding a polyethylene water solution; pressing into a fixed shape; and firing in a high temperature furnace after drying. The technology for preparing the CBN high speed ceramics grinding wheel has the advantages that the binding agent has low firing temperature and strong rupture strength and can bind the grinding material well and wet the grinding material better, the cutting efficiency of abrasive particles is improved, the cutting cost of abrasive particles is reduced, the packaging capacity of the binding agent to the grinding material, the intensity and the sintering temperature are increased, the CNB intensity is not changed and the surface of the CNB is not burnt.

The invention relates to a rare earth aluminium alloy material with high strength and high toughness and the preparation method thereof, belonging to the technical field of metal alloy and the preparation thereof. The invention is characterized in that the invention comprises Mg, Si, Fe, a rare earth compound additive and Al, with the weight percentages as follows: Mg: 0.50-0.60%; Si: 0.35-0.45%;Fe less than or equal to 0.35%; rare earth additive less than or equal to 0.065-0.2%; the margin being Al. The preparation method comprises charging and melting down the 6063 aluminum alloy furnace materials in accordance with the conventional methods, adjusting the furnace temperature, deairing, refining and purifying the melt and then adding Al-RE, Al-Sr and Al-Zr master alloys at the temperature between 720 DEG C and 760 DEG C and preserving heat for 30min-7h, then carrying out homogenization treatment on electromagnetic stirring components and detection, pouring and casting, finally carrying out homogenization treatment and subsequent quick cooling treatment, rapid heating before extrusion, extrusion and on-line quenching treatment as well as artificial aging treatment. The product section obtained from the invention has rapid extrusion and high mechanical property of the section and can improve the apparent mass of the section and increase the modification of oxide film density.