121results about How to "High Vickers hardness" patented technology

The invention relates to a preparation method of a silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder. The silicon nitride-based self-lubricating ceramic cutter material comprises, by volume, 57-70% of micrometer silicon nitride, 5-15% of nanometer silicon nitride, 5-15% of micrometer titanium carbide, 3.2% of alumina, 4.8% of yttrium oxide, and 2-15% of alumina-coated hexagonal boron nitride. The preparation method comprises preparing alumina-coated hexagonal boron nitride composite powder with particle sizes of 4-12 micrometers, weighing micrometer silicon nitride, nanometer silicon nitride and micrometer titanium carbide, respectively preparing their suspension liquids, carrying out ultrasonic dispersion, carrying out mixing, adding alumina and yttrium oxide into the mixture, carrying out ultrasonic dispersion for 15-20min to obtain a composite suspension liquid, carrying out ball milling, adding the alumina-coated hexagonal boron nitride composite powder into the composite suspension liquid, carrying out ball milling, carrying out vacuum drying to obtain mixed powder and carrying out vacuum hot pressing sintering molding. The silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder can improve ceramic cutter mechanical properties and guarantee self-lubricating performances.

The invention relates to alkali-containing alumina silicate glass, and a product, a strengthening method and application thereof. The alkali-containing alumina silicate glass is sequentially subjectedto ion exchange in a salt bath of sodium nitrate and potassium nitrate at 350-450 DEG C for two times to obtain the chemically strengthened alumina silicate glass product. The glass comprises 52-68%of SiO2, 10-23% of Al2O3, 8-13% of Na2O, 0-6% of Li2O, 2-5% of P2O5, 0-5% of ZrO2 and 0-3% of ZnO. The surface pressure stress of the chemically strengthened alumina silicate glass product is greaterthan 600 MPa, the stress layer compression depth thereof is greater than 50 micrometers, the bending strength thereof is greater than 600 MPa, and the Vickers hardness thereof is greater than 600 MPa.The chemically strengthened alkali-containing alumina silicate glass product is applied to an electronic device.

The invention provides a beryllium-free nickel-free high-ductility zirconium-base block body amorphous alloy and a preparation method thereof. The alloy comprises, by atom, 38-50% of Zr, 2-15% of Hf, 20-30% of Cu, 5-10% of Fe, 10-15% of Al, 0-5% of Co, 0-5% of Ag and 0-5% of Nb. The electric arc melting copper mould casting method is adopted for preparation. The amorphous alloy is free of metal elements such as Be and Ni, and biocompatibility of the zirconium-base alloy is improved. The high amorphous forming capacity is achieved, and the zirconium-base block body amorphous alloy with the critical size being no less than 5 mm can be prepared through the copper mould casting method. According to the beryllium-free nickel-free high-ductility zirconium-base block body amorphous alloy, high hardness is achieved, and vickers hardness is larger than 540 Hv; the plastic deformation capacity being larger than 3% is achieved; and the super-cooled liquid phase region range is wide and reaches 92 K at most. The beryllium-free nickel-free high-ductility zirconium-base block body amorphous alloy and the preparation method thereof has very wide application prospects in the fields of biomedical materials such as a precise complex medical component, a joint prosthesis and a human skeleton.

Provided with the following glass components: 8 to 19.5% B₂O₃, 4.5 to 9% SiO₂, 0 to 10% GeO₂, 7 to 12.5% BaO, 0 to 14% MgO, 0 to 0.4% Li₂O, 15 to 34% La₂O₃, 3.5 to 10% Y₂O₃, 8 to 13.5% TiO₂, 0 to 7% ZrO₂, 0 to 11% Nb₂O₅, and 1 to 9% WO₃ by weight, wherein B₂O₃/SiO₂ is at least 1.0, La₂O₃+Y₂O₃+ZrO₂+Nb₂O₅+WO₃ is no more than 54%, and B₂O₃+SiO₂+GeO₂+BaO+MgO+Li₂O+La₂O₃+Y₂O₃+TiO₂+ZrO₂+Nb₂O₅+WO₃ is at least 98%.

The invention discloses a method for producing a multi-metal wear-resistant steel pipe, and the method belongs to the technical field of production of tubes and pipes. The mixing of materials is firstly carried out: the following components by weight content are taken and evenly mixed: 58-61 percent of copper chrome alloy power, 16-18 percent of iron oxide powder, 22-24 percent of aluminium powder and 0.001-0.005 percent of nano-silicon carbide powder; then a seamless steel pipe or a straight seam steel pipe with the wall thickness of 3-5mm is further taken and cut into the appropriate length; then the steel pipe is fixed on a pipe molding machine to lead the steel pipe to rotate at the speed of 1000-1400rpm; the composition is further sent into an inner cavity for centrifugal casting, thereby leading the thickness of a multi-metal layer which is evenly distributed on the pipe wall to be 3-15mm; the rotation state of the steel pipe is continuously kept, and the steep pipe is removed after the curing of the inner wall of the steel pipe or the direct cooling to the room temperature. The method can line the thicker multi-metal layer in the thin-walled steel pipe, and the produced steel pipe has the advantages of great strength, good toughness and wear resistance.

The invention discloses a TiN-Ag nano composite coating and a preparation and application thereof. The TiN-Ag nano composite coating is characterized by being a composite film obtained by magnetron co-sputtering deposition; and a certain substrate temperature is kept in the sputtering process, and the obtained thickness is between 0.5[mu] m and 1[mu] m. The negative bias voltage of a substrate in the preparation process is adjusted by experiments; for an obtained TiN-Ag nano composite coating, the hardness of the substrate is remarkably improved; Ag elements are uniformly distributed in a TiN film, so a contact angle of the TiN film is significantly smaller than that of a TiN film in which no Ag is doped, good hydrophilicity is obtained and cell compatibility is improved; and the TiN-Ag nano composite coating is expected to improve application of a titanium alloy in biomedicine. The material formed by the method disclosed by the invention is stable in structure, the method can be repeated, and preparation conditions are controllable.

The invention belongs to the field of inorganic materials, and relates to spinel transparent microcrystalline glass with a low melting temperature, a preparation method and a performance enhancing method thereof. The oxide component of the microcrystalline glass comprises: 48-55 mol% of SiO2, 14-17 mol% of Al2O3, 2-12 mol% of Na2O, 8-16 mol% of MgO, 2-12 mol% of ZnO, 0.5-4.5 mol% of TiO2, 0.1-3 mol% of ZrO2, and 0.5-1 mol% of Sb2O3. According to the invention, the spinel transparent microcrystalline glass is obtained through glass component design and heat treatment process control, has the melting temperature of less than 1500 DEG C and the transmittance of more than 80% in a visible light region, has the main crystal phases of magnesia-alumina spinel (MgAl2O4) and zinc-alumina spinel (ZnAl2O4), and has the Vickers hardness (Hv) of 800 kgf/mm<2>, wherein the Vickers hardness (Hv) can be improved by more than 15% after ion exchange with a KNO3 molten salt.

The invention discloses a high-strength glass for a display device and a preparation method of the glass. The strength of the glass can be improved from two aspects of component design and strengthening method, wherein the components exert a significant synergistic effect; through the introduction of new components CeO2 and TiO2, and the content relationships among various components are defined,in particular (Na2O+K2O)/Al2O3 and K2O/(Na2O+Li2O) are maintained in a certain range, the amount of ion exchange and the depth of the ion exchange are improved, and through the definition of the synergistic effect among the TiO2, ZrO2 and the CeO2, the thermal stability and the performance of ion exchange of the glass are improved. Finally, through the adoption of twice ion exchange, the mechanical property of the glass is greatly improved, so that the glass provided by the invention has relatively high surface compressive stress, Vickers hardness and excellent strain point and thermal stability, has the properties of compression resistance, scrape resistance and scratch resistance, and can be widely applied to a protective cover plate of the display device.

The invention discloses a sanitary ceramic glaze with a colorful effect. The sanitary ceramic glaze mainly comprises the following raw materials in percentage by weight: 16%-28% of quartz, 18%-27% ofpotassium feldspar, 0.4%-0.8% of dolomite, 3%-4% of kaolin, 3.2%-4.2% of zinc oxide, 9%-11% of aluminum oxide, 9.5%-11.5% of zirconium silicate and 15%-30% of wollastonite. Correspondingly, the invention further discloses a preparation method of the sanitary ceramic glaze with a colorful effect, and a sanitary ceramic. The Vickers hardness of the sanitary ceramic glaze surface can be effectively improved, and meanwhile, the glaze surface has a colorful flashing effect under the irradiation of lamplight and has an outstanding decorative function.

The invention discloses a preparation method of an antibacterial cobalt chromium alloy porcelain artificial tooth. Cobalt chromium alloy consists of Cr, Mo, W, Mn, Nb, Si, Ag, Cu, Ce and Co. The preparation method comprises the following steps: (1) manufacturing a lost foam pattern, then coating a coating on the surface, putting into a sand box after the coating is dried, filling sand and compacting, and putting into a pouring table with a vibration device; (2) putting ingot metal, intermediate alloy and other raw materials into an induction furnace for melting according to the mixture ratio, testing and adjusting ingredients after solution is uniform, then adjusting the pouring temperature, ensuring that the pouring temperature is about 30-40 DEG C higher than that of an alloy melting point and preparing to pour; (3) starting the vibration device, so that the vibration frequency is about 140-160 Hz, and the amplitude of vibration is about 4-6 mm and then pouring the solution in the step (2); and (4) sand-blasting, ultrasonic cleaning and conventional porcelain-baking after cooling and cleaning. The prepared artificial tooth has the advantages of excellent performance and good antibacterial effect.

The invention relates to an N-containing Be-free Ni-free high-hardness Zr matrix body amorphous alloy. The expression of the alloy in atomic percentage is Zr Cu A <c> B <d> X <e>Z <f> N<g>, wherein A is one of Hf and Ti; B is a IIIA group element; X is one or more elements of VIII group elements or rare-earth elements except Ni; Z is one or more elements of IB group elements and VB group elements; a+b+c+d+e+f+g=100%, a is greater than or equal to 25 %, and is lower than or equal to 65 %; b is greater than or equal to 15 %, and is lower than or equal to 65 %; c is greater than or equal to 5 %, and is lower than or equal to 15 %; d is greater than or equal to 0, and is lower than or equal to 15 %; e is greater than or equal to 0, and is lower than or equal to 15 %; f is greater than or equal to 0, and is lower than or equal to 10 %; and g is greater than or equal to 0.05 %, and is lower than or equal to 0.5 %. The N-containing Be-free Ni-free high-hardness Zr matrix body amorphous alloy disclosed by the invention does not contain a metallic element Be and a metallic element Ni, so that the biocompatibility of a Zr -base alloy is improved; the N-containing Be-free Ni-free high-hardness Zr matrix body amorphous alloy has high glass forming ability, and the Zr matrix body amorphous alloy of which the critical dimension is not less than 2mm can be prepared through adopting a copper mold suction casting method; and compared with a N-free amorphous alloy, the N-containing Be-free Ni-free high-hardness Zr matrix body amorphous alloy has the advantage that the vickers hardness of an alloy system is not less than 540Hv.