80results about How to "Strengthened grain boundaries" patented technology

The invention discloses a nanometer WC-Co composite powder modified Ti(CN) based cermet and the preparing method thereof. Titanium carbonitride is used as the main parent metal, metal cobalt and/or nickel are/is used as the binder of raw material powder, carbide and tantalum-niobium sosoloid are used as the additive. The cermet is characterized in: the cermet is added with 6.0% to 27% by weight of raw material power nanometer WC-Co composite powder; the cermet is prepared with the raw material powder by ball grinding crushing, dispersing the nanometer WC-Co composite powder, uniformly mixing, press forming, vacuum or pressure sintering, etc. Compared with traditional cermet, since the cementing phase and the crystal boundary are strengthened, the nanometer WC-Co composite powder modified Ti(CN) based cermet has better wearing resistance, higher strength, fracture toughness and red hardness, thus a tool bit manufactured with the cermet has superior cutting property.

The present invention provides a preparation method of high-strength proppant. Said method includes the following steps: mixing bauxite raw ore powder, rare earth concentrate, combustible substance and binding agent according to a certain mixing ratio, grinding them into powder material, sphere-forming to obtain blank spheres, screen to obtain semi-finished product spheres, roasting at 1250-1500 deg.C, further screening, polishing, removing dust, finally covering the spheres with phenol-formaldehyde resin so as to obtain finished product. Said invention also provides its application range.

The invention relates to a titanium alloy laser cladding surface reinforcing method which comprises the following steps: mixing the following components by weight: 50-100% of Co42 cobalt-based self-fluxing alloy powder, 0-50% of B4C0, 0-50% of SiC, 0-39% of TiN, 0-1.5% of Y2O and 0-1.5% of CeO2, uniformly blending the mixture powder into paste by using a sodium silicate solution, uniformly coating the paste mixture powder on the surface of a titanium alloy, keeping the coating uniform in thickness, drying in air naturally, and performing laser cladding on the coating on the surface of the titanium alloy. By the adoption of the method provided by the invention, the microstructure of a cladding layer can be improved, and the hardness and the wear-resistance of the cladding layer can be further improved.

The invention discloses a wear-resistant white cast iron material, which consists of the following elements in percentage by weight: 2.2 to 3.2 percent of C, less than or equal to 1.2 percent of Si, 2.0 to 3.5 percent of Mn, 7.0 to 10.0 percent of Cr, 0.2 to 1.2 percent of Cu, 0.06 to 0.3 percent of V, 0.02 to 0.15 percent of Ti, 0.001 to 0.003 percent of B, 0.02 to 0.06 percent of Al, 0.02 to 0.15 percent of RE, less than or equal to 0.06 percent of S, less than or equal to 0.06 percent of P, and the balance of Fe. The wear-resistant white cast iron material has the hardness (HRC) of more than or equal to 56, the impact toughness aK of more than or equal to 6J/cm<2>, and a metallographic structure consisting of martensite, carbide (M7C3+a small amount of M3C), secondary carbide and a small amount of retained austenite. The wear-resistant white cast iron material does not contain noble metals such as molybdenum, nickel and the like; and compared with the traditional medium-chromium cast iron material, the wear-resistant white cast iron material has the advantages that the production cost can be greatly saved and the material has good economic benefit.

The invention relates to a low-silver-copper-phosphorus brazing material containing trace indium. The low-silver-copper-phosphorus brazing material is characterized by comprising the following components in percentage by weight: 1.0-3.0% of silver, 6.7-8% of phosphorus, 0.05-0.2% of indium, 0.01-0.05% of mixed rare earth and the balance of copper, wherein the melting temperature range of the brazing material is 600-780 DEG C. The low-silver-copper-phosphorus brazing material has the advantages that the low-silver-copper-phosphorus brazing material can be used for replacing a BCu80AgP copper-based brazing material during brazing copper alloys, the content of the silver is reduced, the low-silver-copper-phosphorus brazing material has appropriate spreadability and liquidity, the low-silver-copper-phosphorus brazing material has appropriate liquidity during brazing copper and copper alloys, the brazing process is high in performance, stable in quality and smooth in surface, the technique performance index is equivalent to that of the Bag15CuP copper-based brazing material, and the brazing material can be prepared into various forms such as filaments, rings and strips by improving the molding technique.

The invention discloses a dispersion strengthening copper-based composite material for a spot-welding electrode and a preparation method of the dispersion strengthening copper-based composite material, and belongs to the technical field of metal-based composite materials. The dispersion strengthening copper-based composite material for the spot-welding electrode is composed of, by mass, 5%-10% of TiC, 0.5%-1% of Ce, 0.5%-1% of La2O3, 0.1%-1% of Al2O3 and the balance Cu. The TiC has the characteristics of being high in hardness, high in melting point and good in heat stability. The TiC and the Cu are not subjected to solid solution with each other. The prepared composite material not only has the TiC characteristics of being high in strength, high in hardness and high in melting point but also has the Cu characteristics of being high in electrical conductivity, high in thermal conductivity and the like. Furthermore, the strength, abrasion resistance and high-temperature resistance of copper can be improved through the TiC. The light rare earth element Ce and the light rare earth oxide La2O3 have the effects of strengthening the grain boundary and refining crystal grains, and thus the strength and machinability of the composite material can be improved.

The invention relates to a rare-earth-containing 34Mn2V high-pressure gas bottle blank and a production method thereof, belonging to the technical field of metallurgy of iron and steel. The production process provided by the invention comprises the following steps: feeding molten iron into a blast furnace, pretreating the molten iron, performing converter smelting, performing LF (ladle furnace) refinement, performing VD (vacuum degasser) vacuum degasification, performing calcium treatment, adding rare earth, performing continuous bloom casting, rolling to obtain a finished blank of 200mm*200mm, sampling, performing heat treatment on the sample, and inspecting. By adopting the technical scheme, the invention has the following advantages in comparison with the traditional technology: the 34Mn2V high-pressure gas bottle blank is low in gas content of H, O and N, and the steel quality is clean; the cross section of the blank is light in carbon segregation degree and manganese segregation degree; the macroscopic structure is compact, the metallurgical structure is pearlite plus ferrite, the grain fineness is Level 7-9, and the level of inclusion in steel is low; the 34Mn2V high-pressure gas bottle blank is uniform in composition, structure and performance; the bottle punching process is fine in performance, is suitable for producing a high-pressure gas bottle through punching and is safe to use; the 34Mn2V high-pressure gas bottle is stable and uniform in performance, high in plasticity and impact property reservation margin and fine in comprehensive mechanical property.

The invention discloses a heat treatment method for a GH4169 high-temperature alloy wire after cold deformation, belongs to the technical field of high-temperature alloy wire preparation, and providesan intermediate heat treatment method for the GH4169 high-temperature alloy wire after cold deformation, wherein the method realizes optimal control of cold drawing deformation and a heat treatment process. The method specifically comprises the following steps of carrying out solid solution heat treatment on an obtained cold-drawn wire, and carrying out heat preservation at 1000-1020 DEG C for 5-20 minutes; cooling to 960 DEG C at a cooling rate of 20 DEG C/min, and keeping the temperature for 60 minutes; finally, filling argon for air cooling; and enabling the vacuum degree to be less than 10<-3>Pa in the solid solution heat treatment process. By means of the method, the cold-drawn wire is obtained, ideal recrystallized grains and precipitated phase structures are obtained according to the optimal control over the cold-drawn deformation and the corresponding heat treatment temperature, precipitated phases are separated out along grain boundaries, the effects of inhibiting grain growth and strengthening the grain boundaries are achieved, and the structure performance requirements of GH4169 alloy wires for aerospace fasteners and spring wires are met.

The invention discloses a preparation method of a rare earth microalloyed shock-resistant hot-rolled H-shaped steel, which includes: during the smelting process of the converter, controlling the w[S] of the molten iron in the converter to be ≤ 0.009%, increasing the tapping temperature of the converter to about 1600°C, Control the amount of slag in the converter; extend the refining time of the LF furnace during the LF refining process; during the VD vacuum refining process, the argon blowing time of the VD furnace should not be less than 10 minutes; the casting speed range of the continuous casting machine is 0.80m/min~0.9m/min, The superheat degree of the steel type is less than 25°C; in the rolling process, the heating temperature is 1210-1250°C, the starting rolling temperature is ≤1200°C, and the final rolling temperature is 870-890°C to obtain H-shaped steel. The invention also discloses a rare earth micro-alloyed shock-resistant hot-rolled H-shaped steel. The invention adopts the narrow component design, and the obtained H-shaped steel can meet the requirements of the yield strength and tensile strength of the shock-resistant hot-rolled H-shaped steel.

The invention relates to a rare-earth-containing 37Mn high-pressure gas bottle blank and a production method thereof, belonging to the technical field of metallurgy of iron and steel. The production process provided by the invention comprises the following steps: feeding molten iron into a blast furnace, pretreating the molten iron, performing converter smelting, performing LF (ladle furnace) refinement, performing VD (vacuum degasser) vacuum degasification, performing calcium treatment, adding rare earth, performing continuous bloom casting, rolling to obtain a finished blank of 200mm*200mm, sampling, performing heat treatment on the sample, and inspecting. By adopting the technical scheme, the invention has the following advantages in comparison with the traditional technology: the 37Mn high-pressure gas bottle blank is low in gas content of H, O and N, and the steel quality is clean; the cross section of the blank is light in carbon segregation degree and manganese segregation degree; the macroscopic structure is compact, the metallurgical structure is pearlite plus ferrite, the grain fineness is Level 7-9, and the level of inclusion in steel is low; the 37Mn high-pressure gas bottle blank is uniform in composition, structure and performance; the bottle punching process is fine in performance, is suitable for producing a high-pressure gas bottle through punching and is safe to use; the 37Mn high-pressure gas bottle is stable and uniform in performance, high in plasticity and impact property reservation margin and fine in comprehensive mechanical property.

The invention relates to an austenitic stainless steel resistant to high temperature and high-concentration sulfuric acid and belongs to the technical field of austenitic stainless steel. The austenitic stainless steel resistant to high temperature and high-concentration sulfuric acid comprises, by weight, 13-19.5% of Cr, 13-22% of Ni, 4.5-6.5% of Si, 0.30-1.5% of Cu, 0.75-2.5% of Mo, 0.07% or less of C, 2% or less of Mn, 0.015% or less of S, 0.03% or less of P, 0.3% or less of Al, inevitable impurities, and the balance Fe. Among steel varieties in the prior art, Zecor, Saramet35 and sandvik SX developed by foreign companies are similar to the austenitic stainless steel on the aspects of material design and overall performance, and compared with the steel of foreign countries, the austenitic stainless steel has more obvious advantages on the aspects of material manufacturing process, yield improvement, corrosion resistance and the like.

The invention discloses alloy powder for die steel laser cladding remanufacturing and a preparation method of the alloy powder. The alloy powder comprises the following components of, in percentage by weight, 0.45%-0.60% of C, 4.20%-8.50% of Co, 3.20%-4.80% of Cr, 1.20%-3.35% of Mo, 0.60%-2.40% of Mn, 0.40%-0.85% of Nb, 0.50%-2.40% of Si, 0.8%-3.2% of B, 0.01%-0.03% of Y2O3, 0.01%-0.03% of La2O3, less than or equal to 0.035% of P, less than or equal to 0.025% of S and the balance Ni. According to the alloy powder for die steel laser cladding remanufacturing and the preparation method of the alloy powder, the crack resistance, the formability, the process stability and the component uniformity of the alloy powder in the laser cladding process can be improved, the high-temperature mechanical property of 4Cr5Mo3V die steel is improved, the service life of the 4Cr5Mo3V steel is prolonged, and the economical efficiency is good.

The invention relates to the technical field of metal alloy materials, and particularly relates to a high-strength and rapid-corrosion magnesium alloy, and a preparation method thereof. The alloy is composed of the following components in percentage by weight: 2%-8% of Al, 0.5%-7% of Ge and the balance magnesium. According to the high-strength and rapid-corrosion magnesium alloy, and the preparation method thereof, the strength and the corrosion speed of the magnesium alloy are increased by adequately utilizing the action of the elements Al and Ge, and the mechanical property of the magnesiumalloy is remarkably improved, and the corrosion speed of the magnesium alloy is remarkably increased through few alloy element adding types and low adding amounts. The compressive strength of the magnesium alloy is capable of reaching 416-431MPa; the corrosion speed in 3% potassium chloride solution at 90 DEG C is capable of reaching 537-582 mm/a; the performance requirement of a fractured ball can be met; and the magnesium alloy can be used as a structural member, and can also be rapidly dissolved under a specific condition.

The invention relates to a preparation method of austenitic stainless steel, in particular to the preparation method of the austenitic stainless steel resisting high-temperature and high-concentrationsulfuric acid and belongs to the technical field of the austenitic stainless steel. The method sequentially comprises the process steps of burdening, oxygen blowing decarburization, reduction, steeltapping, ladle refining, casting, cogging, hot rolling and the like. The invention discloses the austenitic stainless steel resisting the high-temperature and high-concentration sulfuric acid. By query and comparison, steel grades in the prior art, namely Zecor, Saramet35 and sandvik SX developed by foreign companies are similar to a steel grade disclosed by the invention in material design and overall performance; compared with the foreign steel grades, the steel grade disclosed by the invention has more obvious advantages in the aspects of a material preparation process, yield improvement, corrosion resistance and the like.

The invention discloses a method for preparing an Al-Mg3Sb2 composite coating on the surface of magnesium alloy. After being mixed, Mg powder and Sb powder are ball-milled in a ball milling machine, so that Mg chemically reacts with Sb to form an Mg3Sb2 intermetallic compound, Mg3Sb2 powder and granulated Al powder are thermally sprayed to the surface of a magnesium alloy workpiece subjected to sandblasting treatment, and the Al-Mg3Sb2 composite coating is obtained; after the Al-Mg3Sb2 composite coating is heated, the coating is hot-pressed on a press machine. The Mg powder and the Sb powder have a solid-phase reaction in the ball milling process to generate the Mg3Sb2 intermetallic compound, Mg3Sb2 melting point is high, heat stability is good, dislocation movement can be effectively hindered, a substrate and a grain boundary are remarkably reinforced, and high-temperature mechanical properties and creep resistance of the workpiece are improved. Pores and layered structures in the thermally sprayed Al-Mg3Sb2 composite coating disappear in the hot press process because the composite coating plastically deforms and is compacted, compactness of the coating is remarkably improved, and the high-temperature mechanical properties and creep resistance are given full play to.

The present invention discloses an electrode materials of composite rare-earth iridium alloy that is a noble metal alloy containing Ir. The noble metal alloy contains 99.5-99.9 wt% Ir and 0.10-0.50 wt% X; the X is one or a mixture of some of the La, Nd, Pr, Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ce; the noble metal alloy can also contains Th and Al added at the same time. The invention also discloses a sparking plug of composite rare-earth iridium alloy, includes a center electrode and at least a lateral electrode, ignition tip of the center electrode and/or the lateral electrode is the noble metal alloy. The invention provided electrode materials has advantage of high-temperature resistance, strong high-temperature corrosion resistance and excellent performance price ratio; sparking plug of using the electrode materials can provide strong spark on time even the motor is in high-speed, high-temperature high-pressure condition.

The invention relates to a zirconia toughened alumina (ZTA) ceramic material, and discloses a ZTA ceramic material preparation method and a material prepared from the method. The preparation method comprises the following steps: mixing independently prepared chromium hydroxide gel, gamma alumina particles and nano 2Y hydrated zirconia gel to prepare a mixed gel, then carrying out calcining, carrying out airflow crushing, carrying out grinding to obtain slurry, and carrying out spray granulation to obtain raw material ZTA composite ceramic powder, carrying out isostatic pressing molding on theraw material ZTA composite ceramic powder to obtain a ZTA ceramic blank, and then carrying out high-temperature sintering to obtain the ZTA ceramic material. The particle sizes of the nanoscale gammaalumina particles and the 2Y hydrated zirconia gel are controlled, and the nanoscale gamma alumina particles are prepared by mixing aluminum chloride steam with hydrogen and oxygen and then carrying out combustion. The ratio of the aluminum chloride steam to the hydrogen and oxygen are controlled during combustion and the gas pressure during combustion are controlled, so that particle size fluctuation is reduced, the mixing uniformity degree and the granularity of components in coarse ZTA ceramic powder and the raw material ZTA composite ceramic powder are controlled, and properties such as strength, hardness, wear resistance and the like of the toughened ZTA ceramic material obtained by sintering are improved.

The invention relates to the field of copper alloys for the bathroom and kitchen industry and provides a preparing method for an anti-dezincification leadless bismuth arsenic extruded brass rod. The preparing method comprises the step of smelting 61-63% of Cu, 0.5-0.9% of Bi, 0.07-0.12% of As, 0.5-0.8% of Al, 0.08-0.24% of Sn, smaller than 0.1% of Pb, the balance Zn and smaller than or equal to 0.25% of impurities to obtain the solid brass rod by the processes of lead casting and extruding.