Spray forming

About: Spray forming is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 12869 citations. The topic is also known as: spray casting & spray deposition.

Low flow rate nozzle and spray forming process

Abstract: RD-19,940 ABSTRACT OF THE DISCLOSURE An improved nozzle which allows molten metals to be sprayed at low metal flow rates. This is useful for the Plasma Arc Melting process which used a hearth to prevent ceramic inclusions in the end product. The new nozzle design avoids metal freeze-off at the nozzle tip because a bore insert is positioned into a standard nozzle. The bore insert is a conduction heater, e.g., it is fabricated from boron nitride or the like. In use, molten metal is in contact with the insert so it maintains the insert at about the temperature of the molten metal; this then maintains the nozzle tip at a higher temperature than that of a standard nozzle. Freeze-off in the nozzle is non-occurring as long a molten metal is in the crucible.

Method for uniformly cooling steel and device thereof

Abstract: PURPOSE: To execute the uniform cooling in the width direction of a steel in a general cooling equipment with many spray nozzles and to surely eliminate the uneven cooling in the width direction of the steel, in the control cooling, etc., of the hot steel of a thick steel plate, etc. CONSTITUTION: Jetting zones 2 of the adjacent spray nozzles 1 in the steel carrying direction A are overlapped at a part by closely arranging the spray nozzles 1 at least in the steel carrying direction A so as to form jetting interference zone 4. The hot steel W is cooled with the cooling medium jetting spray forming the almost uniform and continuous jetting interference zone 4 in the direction R crossing at the right angle to the steel carrying direction. As necessity requires, buffer plates 6 are arranged along the steel carrying direction A between the adjacent nozzles 1 in the width direction B of the steel to prevent the development of the jetting interference zone along the steel carrying direction A.

Armor plate with continuous gradient reinforcing phase and preparation method thereof

Abstract: The invention relates to an armor plate with a continuous gradient reinforcing phase and a preparation method thereof. A reinforcing phase of the armor plate and a base material are loaded into two independent ejection sources of spray forming equipment. Under protection of inert gases, a deposition plate is heated to increase temperature. Then, the reinforcing phase and the base material are sprayed to the deposition plate at the same time by means of two atomizing nozzles. By controlling sizes of the two nozzles, discharge speed is adjusted in order to obtain a composite material with the content of the reinforcing phase distributed in a continuous gradient mode. Then, a low-weight armor plate is obtained by hot extrusion of the composite material. The reinforcing phase is one or two mixtures among grapheme, silicon carbide and boron carbide. The base material is 5083 high-strength aluminum alloy. The armor plate with the continuous gradient reinforcing phase and the preparation method thereof have following beneficial effects: material obtained by injection molding has advantages such as fine crystalline grains, uniform tissues and fine interfacial adhesion in order to obtain higher strength and anti-ballistic performance of the armor plate; flexible armored design is achieved based on different protection requirements; and the method is easy and feasible.

Bond Strength of Multicomponent White Cast Iron Coatings Applied by HVOF Thermal Spray Process

Abstract: Multicomponent white cast iron is a new alloy that belongs to system Fe-C-Cr-W-Mo-V, and because of its excellent wear resistance it is used in the manufacture of hot rolling mills rolls. To date, this alloy has been processed by casting, powder metallurgy, and spray forming. The high-velocity oxyfuel process is now also considered for the manufacture of components with this alloy. The effects of substrate, preheating temperature, and coating thickness on bond strength of coatings have been determined. Substrates of AISI 1020 steel and of cast iron with preheating of 150 °C and at room temperature were used to apply coatings with 200 and 400 μm nominal thickness. The bond strength of coatings was measured with the pull-off test method and the failure mode by scanning electron microscopic analysis. Coatings with thickness of 200 μm and applied on substrates of AISI 1020 steel with preheating presented bond strength of 87 ± 4 MPa.