46results about How to "Improve medium temperature strength" patented technology

The invention relates to a method for preparing a K417G alloy by using a DZ417G alloy return material. The method comprises the following steps of: smelting the DZ417G alloy return material for the first time after preprocessing the return material, mixing the following materials in mass percent: 0.18-0.22 percent of C, 5.1-5.5 percent of Al, 4.4-4.6 percent of Ti, 9.1-9.4 percent of Cr, 9.8-10.5percent of Co, 2.8-3.0 percent of Mo, 0.017-0.022 percent of B, 0.70-0.75 percent of V, 0.06-0.08 percent of Zr and the balance of Ni, smelting the mixture for the second time to prepare the K417G alloy, refining at temperature ranging from 1550 DEG C to 1590 DEG C for 20min to 30min, and then casting after refining. The invention fully utilizes the DZ417G alloy return material, reduces waste of noble metal resources, and ensures that the prepared K417G alloy has the advantages of good plasticity, high intermediate temperature intensity and good stability through twice smelting. The sigma-phase is not dissolved after being aged for a long time at 850 DEG C, and the K417G alloy can be widely applied to engines of various types.

The invention relates to an aluminum-magnesium-zirconium brick for an RH impregnating pipe and a circulating pipe and a preparation method thereof, and the aluminum-magnesium-zirconium brick is used for an inner pipe of the RH impregnating pipe and the circulating pipe. The aluminum-magnesium-zirconium brick is prepared from the following raw materials in percentage by weight: 25-45% of corundum particles, 15-35% of fused magnesia particles, 15% of corundum fine powder, 10% of alpha-alumina micropowder, 4.85% of zirconia fine powder, 5% of fused magnesia fine powder, 1% of silicon dioxide micropowder, 4% of activated alumina, 0.1% of water reducing agent and 0.05% of dispersant. The aluminum-magnesium-zirconium brick has the advantages of high green strength, no need of sintering, good thermal shock stability and strong resistance to acidic and basic fused slag corrosion.

The invention discloses a prefabricated refractory wallboard used for a graphitized furnace. The prefabricated refractory wallboard comprises a wallboard body provided with a steel reinforcement framework structure, wherein the wallboard body is provided with a lifting ring and a plurality of air vents run through horizontally. The manufacture method for the prefabricated refractory wallboard comprises the steps of 1) taking flint clay as the main material and the aluminate cement, clay fine powder, a-Al203 micro powder, SiO2 micro powder, explosion-proof fibers and the like as the auxiliary material; 2) manufacturing the steel reinforcement framework; 3) conducting proportioning on the flint clay according to the three-level grading, then adding the aluminate cement, the a-Al203 micro powder, the SiO2 micro powder, the clay fine powder, the explosion-proof fiber and other auxiliary materials, and then adding water and stirring after premixing, finally adding the materials into a mould for vibration moulding; and 4) routine maintenance. The prefabricated refractory wallboard disclosed by the invention is simple in structure, convenient in manufacturing, low in labour intensity of the worker and short in maintenance cycle, saves the burning process, improves the capacity of the graphitized furnace, and has the characteristics of energy conservation, environmental friendliness and high efficiency, and the wallboard can be ensured for 50 times.

The invention discloses a machine-pressed non-burning clay brick and a preparation method thereof, comprising the following components: hard clay, soft clay, quartz sand, pyrophyllite, dispersant, solid binder and liquid binder; Non-fired clay bricks can reach the normal temperature strength of fired clay bricks by drying at 120°C, without high temperature firing, low energy consumption, simple production process, high medium temperature strength, and small volume change at high temperature, which not only saves production The cost also reduces problems such as waste gas pollution caused by firing, omits the firing process of traditional clay bricks, and realizes energy saving and emission reduction of refractory clay bricks.

The invention discloses a method for preparing oxide dispersion strengthened cobalt-based super alloy, and belongs to the field of metal-based composite materials. The preparation method comprises the following steps of: pre-mixing Co powder, gamma-phase forming elements (Al and W), oxide thinning element (Hf) and oxide dispersion phase (Y2O3) with grain diameter of 30 to 30 nanometers uniformly,then uniformly dispersing Y2O3 granules into the Co matrix by high-energy ball milling in a high-purity protective atmosphere, and wrapping the high-energy ball milled alloy powder by using a low-carbon steel ladle and performing hot isostatic pressing at the temperature of between 900 and 1,300 DEG C; and performing solid solution heat treatment (1,000 to 1,300 DEG C) and aging heat treatment (600 to 900 DEG C) on a sample after the hot isostatic pressing to obtain a final nano phase strengthened composite material. The method has the main advantage of solving the problem that the improvement on high-temperature strength is greatly limited because carbide in the traditional cobalt-based alloy is easily roughened or dissolved at a high temperature by simultaneously introducing oxide dispersion strengthening and gamma-phase strengthening into the cobalt-based alloy for the first time.

The invention relates to a magnesium-aluminum ramming material for an RH furnace. The magnesium-aluminum ramming material is characterized by being prepared from a base material, phosphate and PT-10 plasticizer; a) the base material is prepared by adding a binding agent prepared from nanosilicon dioxide and silica fume on the basis of grain-grading high-purity magnesia and adding corundum fine powder; b) the adding amount of phosphate is 0.30%; and c), the PT-10 plasticizer is co-produced by the Wuhan Shanda chemical plant and the German BASF limited company, and the adding amount of the PT-10 plasticizer is 0.2-1.0%; the organic plasticizer PT-10 is introduced to meet the construction performance of materials without affecting the high-temperature performance of the material; high strength at a low temperature is generated due to introduction of the binding agent; a substance with low melting phase cannot be generated at a high temperature, and thus the high-temperature performance of the material is improved; after the magnesium-aluminum ramming material is used in the Baosteel RH furnace for more than one year on trial, hundreds of tons of ramming materials are produced and completely meet the operating requirements through experiments.