Ultrasonic waveguides having improved velocity gain are disclosed for use in ultrasonic medical devices. Specifically, the ultrasonic waveguides comprises a first material having a higher acoustic impedance and a second material having a lower acoustic impedance.

Amplifying ultrasonic waveguides

Methods for manufacturing ultrasonic waveguides having improved velocity gain are disclosed. Additionally, methods for manufacturing ultrasonic medical devices including the ultrasonic waveguides are disclosed. Specifically, the ultrasonic waveguides comprises a first material having a higher acoustic impedance and a second material having a lower acoustic impedance.

Methods for producing ultrasonic waveguides having improved amplification

Modelling the correlation between processing parameters and properties of maraging steels using artificial neural network

An improved metal matrix composite utilizes boron carbide as a ceramic additive to a base material metal. The base material metal is aluminum, magnesium, or titanium, or an alloy thereof, provided in powder form with the balance of the material comprising various trace metals such as chromium, copper, iron, magnesium, silicon, titanium, and zinc. The boron carbide powder comprises 10 to 30% by weight of the metal matrix composition. There is at least one other metal additive. The compositions are useful in a variety of applications where lightweight, strength, stiffness, hardness, and low density are desirable. The compositions are extrudable and weldable.

Metal matrix composite

A 3D Printing Rapid Prototyping process using Al/Mg particles coated with a metal (i.e. copper, nickel, zinc, or tin) that (1) prevents oxidation of the Al/Mg particles, and (2) either alone, or when alloyed with the aluminum or magnesium core metal, melts below the liquidus temperature of the core.

Aluminum/magnesium 3D-Printing rapid prototyping

The calculation of ferrite decarburizing depth considering the effects of the chemical composition of steel and heating condition was attempted using a diffusion model and its propriety was confirmed by comparing with the experimental results. The calculation values of ferrite decarburizing depth were almost the same as the experimental values under most heating conditions, which indicates that the model is appropriate for simulation of the ferrite decarburizing depth considering the steel composition and heating condition. Only in the case where steel with a high proportion of titanium, vanadium and chromium was heated to under 973 K, did the ferrite decarburizing depth of the experiment show lower values than that of the calculation. It was speculated that small MC carbides as TiC or VC and chromium which stabilizes cementite affected the formation of ferrite decarburizing area.

https://www.jstage.jst.go.jp/article/isijinternational1989/40/6/40_6_619/_pdf

Calculation of Ferrite Decarburizing Depth, Considering Chemical Composition of Steel and Heating Condition

A pellet for fabricating a metal matrix composite is made of a mixture of a matrix member of a metal powder and at least one reinforcement selected from whiskers, short fibers and suitable particles, the reinforcement being uniformly distributed in a matrix of the metal powder and said mixture being kept in a shape with a binder, wherein said pellet has a surface layer of dried and rigid portion of said mixture which is rigid enough to keep its shape under an external pressure applied thereto. The pellet is formed from a flat cake of the mixture separated from a slurry consisting of a solution medium and the mixture dispersed therein uniformly. Alternatively, the pellet is formed from the mixture in a dried condition with a granulation binder diluted with a solution medium.

Pellet for fabricating metal matrix composite and method of preparing the pellet

PURPOSE: To enhance the toughness, weldability and heat treatability on the superhigh strength level by adding a prescribed amount of Si, C, Mn, P, S, Ni, etc. to Fe. CONSTITUTION: This superhigh tensile steel consists of ≤0.5% C, ≤0.3% Si, ≤0.3% Mn, ≤0.05% P, ≤0.05% S, 10W25% Ni, ≤2% Co, 0.5W4% Mo, 0.5W 5% Ti, 0.1W3% Al and the balance Fe. This steel is heated at the Af temp. or above to form an austenite monophase, and it is cooled to ordinary temp. and subjected to soln. heat treatment. Aging is then carried out at about 300W650°C to further ensure weldability and heat treatability. COPYRIGHT: (C)1982,JPO&Japio

Super-hightensile steel

Described herein is an SiC-reinforced aluminum alloy composite material of the type having silicon carbide uniformly dispersed in an aluminum alloy matrix containing magnesium as a strengthening element, characterized in that the composite material contains Al4C3 in an amount smaller than 0.5 wt% and residual oxygen in an amount smaller than 0.4 wt%, and has a modulus of elasticity higher than 9000 kgf/mm².

SiC-reinforced aluminum alloy composite material

PURPOSE: To manufacture the composite material without developing crack by making inner face of compacting space in a die for cold compacting the specific gradient of taper face and inner face of compacting space in the die for hot compacting the specific draft of tapered face. CONSTITUTION: Al allow powder containing activate intensing element of Mg, Li, Zn, etc., and granular or fibrous ceramic reinforced material, are uniformly mixed. The cold compacting of the mixed powder 6 is done and further, the hot compactings are done at ≥400°C and at 400-600°C in order, to manufacture the ceramic reinforced Al alloy composite material. In this manufacturing process, at the time of using A for size of bottom part in the compact space 4 in the die 1 for cold compacting and B for size of upper face of the space for supplying the mixed powder 6, side face in the compacting space 4 is formed with tapered face having 0.005-0.05 of (B-A)/A. Further, inner face of the compacting space in the die for hot-compacting is formed with tapered face having 0.3-2° the draft angle. By this method, the powder compact body having ≥60% relative density is easily manufactured without developing crack. COPYRIGHT: (C)1992,JPO&Japio

Hiroyuki Morimoto

Papers

Calculation of Ferrite Decarburizing Depth, Considering Chemical Composition of Steel and Heating Condition

Pellet for fabricating metal matrix composite and method of preparing the pellet

Super-hightensile steel

SiC-reinforced aluminum alloy composite material

Manufacture of ceramic reinforced al alloy composite material