JPS60110863A - Manufacture of thruster - Google Patents

Abstract

PURPOSE:To improve the physical properties of a formed body by spraying a heat-resistant metal and ceramics on the surface of the base material of a thruster or a mandrel, winding heat-resistant fiber, and uniting them to one composite body. CONSTITUTION:A heat-resistant metal or the metal and ceramics are sprayed on the surface of the base material of a thruster such as a jet engine or a rocket engine or on the surface of a mandrel, heat-resistant fiber is wound, and they are united to one composite body. In case of the mandrel, the mandrel is removed chemically and/or physically. Thus, the physical properties of a formed metallic body or a formed metal-ceramic body are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION This refers to a device that generates propulsive force like a jet engine tongue, that is, a propulsion device. ! '/, a combination of a chamber and a nozzle skirt following it, or an injector for injecting fuel or oxidizing agent, is also called a thruster), especially metal formed by thermal spraying, Alternatively, the present invention relates to the above-mentioned method for improving the physical properties of metal and ceramic molded bodies.

Thermal spraying processes are currently in practical use to impart properties such as heat resistance, wear resistance, and corrosion resistance to general industrial equipment and parts, as well as aerospace equipment and parts. A wire-like or powder-like material is used as spray particles, and these are made to collide with the object to be sprayed at high speed and continuously, solidifying and adhering to the object to be sprayed to form a spray coating.

In the currently commonly used thermal spraying method under atmospheric pressure that does not use a vacuum chamber, many porosity, oxides, and
Contains foreign matter, and the flight speed of particles decreases due to air resistance from the spray gun to the object to be sprayed.Therefore, there are also problems with the adhesion between the coating and the base material and the internal bonding strength of the coating itself. Physical properties of the film (mechanical properties, physical/chemical properties, etc.)
It is a factor that causes deterioration.

The internal structure of a conventional coating is schematically shown in FIG.

The purpose of the present invention is to improve the mechanical properties of a molded body when a gas jet thruster for an artificial satellite is manufactured using a molded body made of thermally sprayed layer A, ceramics, or a metal/ceramic composite. There is work that has been done.

That is, the present invention provides: (1) A heat-resistant metal or /d on the surface of the thruster base material.
A method for producing a thruster characterized by thermally spraying the metal and ceramics, and wrapping the metal and ceramics in a composite body, and (2) coating the surface of the mandrel with the heat-resistant metal or with the metal. Ceramics are thermally sprayed and heat-resistant fibers are wrapped around the mandrel to form a composite ridge.
Alternatively, it relates to a method for producing a thruster characterized by physically removing the thruster.

The present invention is applicable not only to artificial satellite motor thrusters and artificial satellite low-thrust gas jet thrusters, but also to rocket engine combustion chambers and nozzle skirts, and other aerospace equipment and general industrial applications that require strength due to thermal spraying. It can be applied to equipment, parts, etc.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and the like.

Figures 2 (1) to (4) #'i are diagrams showing an embodiment of the present invention in the order of steps.

First, while rotating the mandrel 1 in the direction of the arrow as shown in FIG. 2(1), a thin thermal spray layer is formed using the thermal spray gun 2. In this case, use mandrels such as Ou, W, Ti, Oo,
Stainless steel or the metal and ceramics such as alumina, zirconia, and alumina/zirconia composites are used.

Figure 2 (old B) is an enlarged schematic cross-sectional view of part A in Figure 2 (11 (A)) Next, as shown in Figure 2 (2), the fibers are winding.

As for the winding method, it can be done mechanically or by hand. Regarding the material of the fibers, materials such as w, ht, o3. c, sho.

B etc. can be used depending on the purpose. Figure 2 121 (B
) is an enlarged cross-sectional schematic diagram of section A in FIG. 2+21(A).

In Figure t4!2 (3), the thermal spraying gun 2 further sprays the wound fibers to coat the fibers. During this process, the fibers become composite and integrated with the sprayed layer. Figure 2 (31 (BJ) schematically shows the state;
FIG. 3 is an enlarged cross-sectional view of section A in FIG.

After that, the mandrel is removed. As for this removal method, for example, a mandrel? :, NaoH,HostH
Cl, H? There is a chemical method of eluting with a mixed solution of , HNO, +HF, etc. In this case, the mandrel uses a material that can be eluted and removed with these solutions. Moreover, not only chemical removal but also physical and mechanical methods can be used, and chemical methods and these methods can also be used in combination. In addition,
Figure 2 (4) shows the completed state of the fiber-reinforced thermal spray molded body obtained in this way (mandrel (The mandrel has been removed.)
It is. Figure 82 + 4 + CB) is Figure 2 (4) (A) +
7) A-A' line sectional view, FIG. 2 (4) (0) is an enlarged cross-sectional schematic diagram of part B in FIG. 2 (4) CB).

[Brief explanation of drawings]

Figure 1 is a diagram schematically showing the internal structure of a normal thermal spray coating.
Figures 2 (1) to (4) are diagrams showing an embodiment of the method of the present invention in the order of steps, and (B) Fi (
A) An enlarged schematic cross-sectional view of part A in Figure 2 (41 (B) is Figure 2 (4)
1 (0) is an enlarged cross-sectional schematic diagram of part B in Figure 2 (41 (B)). Sub-agent 1) Mei-Fu agent Ryo Hagiwara - Figure 1 Figure 2

Claims (2)

[Claims] (1) A method for producing a thruster, which is characterized by spraying a heat-resistant metal or a ceramic with the metal on the surface of a thruster base material, and wrapping the heat-resistant fibers in a composite body. (2) After irradiating the surface of the mandrel with a heat-resistant metal or a ceramic material 1c and wrapping heat-resistant fibers to form a composite, the mandrel is heated by chemical bending 9/or physical A thrustano manufacturing method characterized by: