摘要:
Ultrafine particles of aluminum nitride having a morphologically anisotropic structure of columns, plates, or whiskers such that the ratio of thickness or width to length or the ratio of thickness to width or length of particle is not less than 1 are produced by thermally melting a binary alloy of metallic aluminum and a rare earth element in a nitriding atmosphere containing nitrogen. By this method are produced composite ultrafine particles which substantially comprise ultrafine particles of aluminum nitride having the morphologically anisotropic structure and ultrafine particles of the rare earth nitride which functions as a sintering auxiliary therefor. The composite ultrafine particles or an aggregate thereof are usable as a raw material for the production of a sintered article, a reinforcing material for various metal-based composite materials, a blast powder, and the like.
摘要:
A superplastic aluminum-based alloy material consisting of a matrix formed of aluminum or a supersaturated aluminum solid solution, whose average crystal grain size is 0.005 to 1 .mu.m, and particles made of a stable or metastable phase of various intermetallic compounds formed of the main alloying element (i.e., the matrix element) and the other alloying elements and/or of various intermetallic compounds formed of the other alloying elements and distributed evenly in the matrix, the particles having a mean particle size of 0.001 to 0.1 .mu.m. The superplastic aluminum-based alloy material is produced from a rapidly solidified material consisting of an amorphous phase, a microcrystalline phase or a mixed phase thereof by optionally heat treating at a prescribed temperature for a prescribed period of time and then subjecting to a single or combined thermo-mechanical treatment. The superplastic aluminum-based alloy material of the present invention is suited for to superplastic working.
摘要:
An aluminum alloy powder for coating materials and a coating material containing the aluminum alloy powder. The aluminum alloy powder comprises an amorphous aluminum alloy consisting essentially of from 83 to 91% of Al, from 0.5 to 5% of Ca and from 8 to 12% of Ni, all in atom %, and comprising a leaf-shaped particle having a thickness of 0.3 to 3 .mu.m, a minor axis of from 10 to 150 .mu.m, a ratio of the minor axis to a major axis of from 1 to 3, and an aspect ratio which is the ratio of the minor axis to the thickness of from 3 to 100, wherein the aluminum alloy powder is contained in an amount of from 5 to 25 parts by weight based on 100 parts by weight of the total weight of (i) the coating material resin component and (ii) aluminum alloy powder, and the coating material resin component is selected from the group consisting of a water-based synthetic latex and a water-soluble resin. The aluminum alloy powder has a superior dispersibility in a resin in a coating material. When added to a coating material and then coated, the aluminum alloy powder can bring about leafing in a desirable state, so that the coating surface can be effectively covered with the powder. The aluminum alloy powder can impart better hiding power and reflecting properties, even when added in a smaller quantity than conventional powders. Since the aluminum alloy powder is comprised of an amorphous alloy, it does not cause deterioration of reflecting properties, even when used in coating materials containing water-soluble solvents.
摘要:
The present invention provides a corrosion resistant aluminum-based alloy consisting of a compound which has a composition represented by the general formula:Al.sub.a M.sub.b Mo.sub.c Hf.sub.d Cr.sub.ewherein:M is at least one metal element selected from Ni, Fe and Co and a, b, c, d and e are atomic percentages falling within the following ranges: 50%.ltoreq.a.ltoreq.88%, 2%.ltoreq.b.ltoreq.25%, 2%.ltoreq.c.ltoreq.15%, 4%.ltoreq.d.ltoreq.20% and 4%.ltoreq.e.ltoreq.20%,the compound being at least 50% by volume composed of an amorphous phase. The aluminum-based alloys not only have a high degree of hardness, strength and heat resistance but also exhibit a significantly improved corrosion resistance.
摘要:
Disclosed are high strength magnesium-based alloys consisting essentially of a composition represented by the general formula (I) Mg.sub.a M.sub.b X.sub.d, (II) Mg.sub.a Ln.sub.c X.sub.d or (III) Mg.sub.a M.sub.b Ln.sub.c X.sub.d, wherein M is at least one element selected from the group consisting of Ni, Cu, Al, Zn and Ca; Ln is at least one element selected from the group consisting of Y, La, Ce, Sm and Nd or a misch metal (Mm) which is a combination of rare earth elements; X is at least one element selected from the group consisting of Sr, Ba and Ga; and a, b, c and d are, in atomic percent, 55.ltoreq.a.ltoreq.95, 3.ltoreq.b.ltoreq.25, 1.ltoreq.c.ltoreq.15 and 0.5.ltoreq.d.ltoreq.30, the alloy being at least 50 percent by volume composed of an amorphous phase. Since the magnesium-based alloys of the present invention have high levels of hardness, strength, heat-resistance and workability, the magnesium-based alloys are useful for high strength materials and high heat-resistant materials in various industrial applications.
摘要:
The present invention provides high strength magnesium-based alloys which are at least 50% by volume composed of an amorphous phase, the alloys having a composition represented by the general formula (I) Mg.sub.a X.sub.b ; (II) Mg.sub.a X.sub.c M.sub.d, (III) Mg.sub.a X.sub.c Ln.sub.e ; or (IV) Mg.sub.a X.sub.c M.sub.d Ln.sub.e (wherein X is elements selected from the group consisting of Cu, Ni, Sn and Zn; M is one or more elements selected from the group consisting of Al, Si and Ca; Ln is one or more elements selected from the group consisting of Y, La, Ce, Nd and Sm or a misch metal rare earth elements; and a, b, c, d and e are atomic percentages falling within the following ranges: 40.ltoreq.a.ltoreq.90; 10.ltoreq.b.ltoreq.60, 4.ltoreq.c.ltoreq.35, 2.ltoreq.d.ltoreq.25, and 4.ltoreq.e.ltoreq.25. Since the magnesium-based alloys have high hardness, high strength and high corrosion-resistance, they are very useful in various applications. Further, since their alloys exhibit superplasticity near the crystallization temperature, they can be processed into various bulk materials, for example, by extrusion, press working or hot-forging at the temperatures of the crystallization temperature .+-.100.degree. C.
摘要:
The present invention provides high strength, heat resistant aluminum-based alloys having a composition represented by the general formula Al.sub.a M.sub.b Ce.sub.c, wherein M is at least one metal element selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu and Nb; and a, b and c are atomic percentages falling within the following ranges:50.ltoreq.a.ltoreq.93, 0.5.ltoreq.b.ltoreq.35 and 0.5.ltoreq.c.ltoreq.25,the aluminum alloy containing at least 50% by volume of amorphous phase. The aluminum-based alloys are especially useful as high strength, high heat resistant materials in various applications and since they exhibit superplasticity in the vicinity of their crystallization temperature, they can be easily processed into various bulk materials by extrusion, press woring or hot-forging at the temperatures within the range of the crystallization temperature .+-.100.degree. C.
摘要:
The present invention provides high-strength and heat resistant aluminum alloys having a composition represented by the general formula Al.sub.a M.sub.b La.sub.c (wherein M is at least one metal element selected from the group consisting of Fe, Co, Ni, Cu, Mn and Mo; and a, b and c are atomic percentages falling within the following ranges:65.ltoreq.a.ltoreq.93, 4.ltoreq.b.ltoreq.25 and 3.ltoreq.c.ltoreq.15),the aluminum alloys containing at least 50% by volume of amorphous phase. The aluminum alloys are especially useful as high strength and high heat resistant materials in various applications and, since the aluminum alloys specified above exhibit a superplasticity in the vicinity of their crystallization temperature, they can be readily worked into bulk forms by extrusion, press working or hot forging in the vicinity of the crystallization temperature.
摘要:
Ni-based alloys comprising 8 to 34 atom % of Al, 2 to 70 atom % of one or more elements selected from the group consisting of Fe, Co, Mn, and Si (providing that each or total of Fe and Co is present in an amount of 2 to 70 atom % and/or each or total of Mn and Si is present in an amount of 2 to 25 atom %), and the balance to make up to 100 atom % of substantially pure Ni, and possessing great strength and high ductility.These alloys enjoy outstanding ductility and strength and, therefore, are ideally useful for various filter materials and composite materials.
摘要:
An amorphous Co-based metal filament having a circular cross-section made of an alloy composed mainly of Co-Si-B or Co-Me-Si-B (wherein Me is at least one metal selected from the group consisting of Fe, Ni, Cr, Ta, Nb, V, Mo, Mn, W and Zr). This filament is produced by jetting the above alloy into a rotating member containing therein a cooling liquid through a spinning nozzle having a hole diameter which is determined according to the amorphous metal-forming ability (critical thickness to form an amorphous phase) to thereby cool-solidify the jetted molten alloy and form a filament, and then winding the filament continuously on the inner walls of the rotating member by the rotary centrifugal force thereof. This amorphous metal filament is corrosion resistant, is tough and has high electromagnetic characteristics, and is very useful as industrial materials, such as electric and electronic parts, composite materials and fibrous materials.