134results about How to "High glass forming ability" patented technology

Al2O3-Y2O3-ZrO2/HfO2 ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Certain ceramic particles according to the present invention can be are particularly useful as abrasive particles.

Disclosed is a magnesium based amorphous alloy having a good glass forming ability and ductility. The Mg based amorphous alloy has a composition range of Mg_100-x-yA_xB_y where x and y are respectively 2.5≦x≦30, 2.5≦y≦20 in atomic percent. Here, A includes at least one element selected from the group consisting of Cu, Ni, Zn, Al, Ag, and Pd, and B includes at least one element selected from the group consisting of Gd, Y, Ca, and Nd.

The invention discloses active amorphous brazing filler metal for brazing ZrB2-SiC ceramic materials, a preparation method for the active amorphous brazing filler metal and a brazing process, particularly relates to Cu-Ti-Ni-Zr high-temperature active amorphous brazing filler metal for brazing ZrB2-SiC ultra-high-temperature ceramic materials, a preparation method for the Cu-Ti-Ni-Zr high-temperature active amorphous brazing filler metal and a brazing process, and belongs to brazing filler metal in the amorphous and metallurgy fields. The components of the brazing filler metal comprise, by atomic percentage, 36.0-42.0% of Cu, 30.0-35.0% of Ti, 16.0-23.0% of Zr and the balance Ni. The melting temperature of the active amorphous brazing filler metal is 1110-1150 K, and the brazing temperature is 1183-1273 K. The Cu-Ti-Ni-Zr high-temperature active amorphous brazing filler metal obtained through the rapid condensation technology has good wettability. The room temperature shearing strength of the ZrB2-SiC ultra-high-temperature ceramic materials brazed through the amorphous brazing filler metal in a vacuum brazing mode can be as high as 160 MPa and much higher than that of Cu-based and Ag-based brazing filler metal.

An amorphous Nickel-Free Zirconium alloy which is readily formed through copper mold casting, comprising a composition consisting of four elements in which the first element is Zr, the second element is Ti, the third element is Cu and the fourth element is Al, wherein an atomic percent of the first to the fourth elements in the composition are represented by a, b, c and d respectively, wherein a=45˜69%, b=0.25˜8%, c=21˜35%, and d=7.5˜15%, where a sum of a, b, c and d is smaller than or equal to 100%. The composition of the amorphous alloy within the above range is melted in a copper mold to form bulk amorphous materials or parts which have characteristics of high tensile strength, high fracture toughness, low Young's modulus and high corrosion resistance.

The invention relates to a sort of cerium-based block amorphous alloy, which is formed primarily from the cerium and contains at least 50% amorphous phase percentage by volume, and can be represented by the formula: CeaAlbNicCudMe, wherein 50<=a<=80, 5<=b<=20, 5<=c<=20, 5<=d<=20, 0<=e<=10, and a+b+c+d+e=100, and said transition metal elements M is Sc, Nb, Ti, V, Cr, Mn, Fe, Co, Y, Zr, Mo, La, Pr , Nd or Hf. The preparation of the alloy is in the electric arc furnace of argon atmosphere absorbed with the titanium and the steps is: smelting each group according to needed atomic matching, mixing them evenly, and getting the key metal ingoting after cooling, smelting the ingoting again by normal chill casting method, inhaling the flux to the water-cooled copper mould through the suction apparatus in the furnace, then getting the alloy.

To provide a Cu-based amorphous alloy having a glass-forming ability higher than that of a Cu—Zr—Ti amorphous alloy and a Cu—Hf—Ti amorphous alloy, as well as excellent workability and excellent mechanical properties without containing large amounts of Ti.

A Cu-based amorphous alloy characterized by containing 90 percent by volume or more of amorphous phase having a composition represented by Formula: Cu_100-a-b(Zr,Hf)_a(Al,Ga)_b [in Formula, a and b are on an atomic percent basis and satisfy 35 atomic percent≦a≦50 atomic percent and 2 atomic percent≦b≦10 atomic percent], wherein the temperature interval ΔTx of supercooled liquid region is 45 K or more, the temperature interval being represented by Formula ΔTx=Tx−Tg (where Tx represents a crystallization initiation temperature and Tg represents a glass transition temperature.), a rod or a sheet having a diameter or thickness of 1 mm or more and a volume fraction of amorphous phase of 90% or more can be produced by a metal mold casting method, the compressive strength is 1,900 MPa or more, the Young's modulus is 100 GPa or more, and the Vickers hardness is 500 Hv or more.

The invention relates to Co radical Co-Si-B-Nb block non-crystal alloy that includes Co, Si, B and Nb elements. It adds the fourth element Nb to Co-Si-B ternary system and taking micro alloying. The constituents range are [(Co12Si)1-xBx]1-yNby, and x=23-29at%, y=3-5at.%; the best block non-crystal ally is (Co68.6Si5.7B25.7)0.96Nb4. The method includes the following processes: mixing, taking copper film negative pressure casting adsorbing, the argon gas pressure is 0.06-0.08MPa, fusion melting current density is 180-220A/cm2, and draught head is 0.03+0.005MPa, the diameter of the block non-crystal is 3mm. The advantages of the invention are that it conquers the random of the constituents and develops Co radical Co-Si-B-Nb block non-crystal alloy. It determines the constituents range and the best constituents.

An iron-based amorphous alloy material with high glass-forming capability consists of the elements of Fe, Cr, Mo, C, B, Y and Co, wherein the atomic number ratio of the Fe, Cr, Mo, C, B, Y and Co are (24-32%):(16-24%):15%:14%:15%:6%:2%; the atomic number ratio of the elements of Fe, Cr, Mo, C, B, Y and Co are 24%:24%:15%:14%:15%:6%:2%; the atomic number ratio of the elements of Fe, Cr, Mo, C, B, Y and Co are 28%:20%:15%;14%:15%:6%:2%; and the atomic number ratio of the elements of Fe, Cr, Mo, C, B, Y and Co are 32%:16%:15%:14%:15%;6%:2%. The iron-based amorphous alloy material not only has a simple preparation technology, is low in cost, but also has good amorphous-forming capability and glass-forming capability, and also has mechanical properties with high strength and high hardness.

The invention discloses a method for preparing an amorphous ceramic coating. The method comprises the following steps: processing laser cladding into a powder by using a ceramic material, cladding the powder onto a substrate through laser equipment by a laser cladding technology to form the an amorphous ceramic coating with amorphous structure on the main part. The laser cladding ceramic material comprises the following components: a 20%-75% of aluminum oxide, 10%-40% of zirconia and 10%-60% of rare earth oxide. The method provided by the invention improves the glass forming ability, avoids the phenomenon of easy generation of cracks due to rapid melting and rapid cooling in the processing of laser, greatly improves the rate of finished products and reduces the production cost; and the amorphous ceramic coating gains significantly improved toughness and strength and has excellent wear resistance and corrosion resistance.

The invention relates to a large-block copper-based amorphous alloy and a preparation method thereof. The large-block copper-based amorphous alloy comprises the following components of, by atomic percent, 43-48 at.% of Zr, 5-10 at.% of Al, 0-2 at.% of Sn and the balance Cu. According to the large-block copper-based amorphous alloy and the preparation method thereof, the novel copper-based large-block amorphous alloy with the critical casting diameter of 3 mm in a Cu-Zr-Al system and a Cu-Zr-Al-Sn system is directly determined through combination of thermodynamic calculation and a binary eutectic ratio method; and the generation of a precipitation phase is inhibited by regulating and controlling the binary eutectic ratio, and the large-block amorphous alloy with the critical casting diameter of 5 mm and the large-block amorphous alloy with the critical casting diameter of 7 mm are obtained in the Cu-Zr-Al system and the Cu-Zr-Al-Sn system correspondingly.