JPS63195254A - Production of composite material - Google Patents

Abstract

PURPOSE:To obtain a composite material capable of mass production, by thermally spraying powder such as Fe-B, etc., onto an iron metallic member, thereafter heating the member to a specific temp. and rendering only the required part hard while the remaining part is formed to a metallic material having excellent toughness. CONSTITUTION:The Fe-B or Fe-B alloy powder and simple metallic powder such as Mo, Cr, B, Co, Cu and Si or the metallic powder uniformly mixed with the alloy powder contg. these powers is prepared. Said metallic powder is thermally sprayed onto the iron metallic member to form a thermally sprayed layer having 0.1-5mm thickness. The thermally sprayed layer is then heated to 1,150-1,400 deg.C in a nonoxidizable atmosphere to form a hard alloy on the metallic member. Said hard alloy is formed of 49-50% hard phase consisting of a complex fluoride contg. Fe and a combining phase which combines the same.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the production of a composite material in which a boride-based hard alloy with excellent wear resistance, corrosion resistance, and high-temperature oxidation resistance is formed on an iron-based metal member. Regarding the method.

[Conventional technology]

A method for producing a hard alloy having iron fence compound and iron complex boride as a hard phase is proposed in Japanese Patent Publication No. 56-15773 and Japanese Patent Publication No. 60-57499.

When using this technology to manufacture parts with excellent wear resistance and corrosion resistance, the powder is crushed using a pole mill.

The powder has a particle size of 50 μm or less, is compression molded, and is liquid-phase sintered to form a hard alloy. In case C: where the properties of only a part of the member are required, the hard alloy is joined to the metal member by methods such as brazing or diffusion bonding.

[Problem that the invention seeks to solve]

However, if the shape of a single member becomes complex, processing the joining surfaces (= expensive), and joining itself becomes difficult, the entire part must be made of hard alloy. When machining screws, holes 9, etc. in places where they are not required, inefficient machining methods such as electric discharge machining must be used, and in addition to using expensive hard alloys even in places where the characteristics are not required, it is extremely economical. damage one's sexuality.

In order to improve this point, the present invention utilizes thermal spraying to form only the parts where the properties are required (=hard alloy), and the other parts are formed into a material that is relatively inexpensive, has excellent toughness, and is easy to process. We propose a manufacturing method for composite materials using iron-based metal materials.

[Means for solving problems]

The configuration of the present invention for achieving the above object will be explained with reference to Drawing C.

The iron-based metal member 1 is made in advance to be smaller than its final dimensions by the thickness of the hard alloy formed on its surface. The material may be any material as long as it has a melting point higher than the heating temperature of the hard metal, as described later.

Next, the metal member is cleaned with a solvent, and the part to be thermally sprayed is sprayed with alumina, grid, etc. to remove the oxide film and roughen the surface, thereby increasing adhesion during thermal spraying.

A mixed powder mixed with carbon to have the desired composition is sprayed onto the metal member thus treated to a required thickness. Of the powders used, re
-B or Fe-B based alloy powder is produced by an atomization method 2 For example, JOB-13Cr-FeBal, 15
．． 98-FeBal, IOB-12Cr-10W-
FeBat, 13B-5Cr-FeBa! (D-things are available.

It is also possible to use ferroboron powder, and the composition is not particularly limited to this. Also.

Single powders such as Mo, Ni, Cr, W, Co, etc. or alloys/powders containing two or more of these are commercially available powders for thermal spraying.

For example, molybdenum powder, iron chromium powder, nickel chromium powder,
Molybdenum nickel powder etc. can be used.

It is not limited to these. Further, the thermal spraying apparatus can use known methods such as plasma spraying, reduced pressure plasma spraying, and explosive thermal spraying, and the thermal spraying conditions are adjusted as appropriate depending on the composition of the powder.

The thickness of the sprayed layer may be determined depending on the application, but a range in which the thickness of the hard metal is 1 to 5 mm is selected. 0.1m
If the thickness is less than m, the properties as a hard alloy will be insufficient, and if the thickness exceeds 5I, the economic efficiency as a composite material will be impaired.

The metal component with the sprayed layer is first subjected to a heat treatment to achieve the formation of a hard phase and metallurgical bonding to the metal component. The thermal spray layer is a mixture with a layered structure of mixed powder, and has a hardness of HV400 to 700, but after heat treatment, MxNxB type complex boride with a particle size of 1 to 5 μm is uniformly dispersed. However, the hard alloy 2 has a high hardness of HV750 to 1300. Heating must be performed in a non-oxidizing atmosphere (excluding nitrogen). It is not preferable to use an oxidizing atmosphere or nitrogen because the formation of a hard phase is inhibited due to oxidation or nitridation. A temperature of 1,150°C or higher is required to form a hard phase and achieve metal bonding to the metal component, and heating to 1,400°C or higher will accelerate the reaction with the metal component, leading to deterioration of the properties of the hard alloy and Since the shape may collapse, the temperature is set at 1150 to 1400°C.

The heating time at 1150 to 1400°C may be short.

High-frequency heating for 2 to 3 seconds is enough to achieve the purpose, but usually 5 to 9 seconds depending on the size of the item in terms of temperature uniformity.
0 minutes is selected.

[Effect]

The composite material manufactured in this way has hard alloy 2 only in the parts that require properties and lining, and the other parts are made of iron-based metal that is easy to process such as screws 3 and has toughness. 9 The two were connected by a perfect metal bond. A composite material with wear resistance, corrosion resistance, and high temperature oxidation resistance.

〔Example〕

Hereinafter, one aspect of the present invention will be explained in detail.

Example 1 Steel J Is, 8841.54 was used as the iron-based metal member.
5C.

80M435.8US304,5US405,5US4
40C was prepared.

We also use Fe-B powder (containing 15.9% B), which has a particle size of -100 mm, as a powder for thermal spraying.
i/Yu (D Fe-B-Cr alloy powder (B: 10%
,Cr:135i1! i-containing).

-100) y i/ x (D Fe -B-Cr-
W alloy powder (B:9.2%゜Cr212%, W:1
-200 mesh i/s molybdenum powder, -200 mesh nickel-based self-fluxing alloy (B
:3.5L Cr:15%, Fe:49I6.
Si: 4% content).

-200 mesh cobalt-based self-fluxing alloy (B: 4%.

Cr: 19%, Ni: 28%. S i :4
! %, Mo: 6% content).

-200 mesh nickel chromium alloy (Cr: 50%
) was prepared.

Next, these raw material powders were blended into the composition shown in Table 1 (in Table 1, the numbers in parentheses indicate the weight percent of the powder composition), and after uniformly mixing with a V-type mixer, After thoroughly drying in a constant temperature dryer (50°C), a film with a thickness of 1.0 mm was coated onto the metal members shown in Table 1 using a plasma spray machine.
~5-C: Thermal spraying was performed. The metal members were cleaned with a solvent before thermal spraying, and then subjected to #32 to #80 sandblasting.

The main conditions for plasma spraying were: thermal spraying machine: Meticore MC - secondary gas (argon): 100PS secondary gas (hydrogen'): 50PSI plasma supply power crab 500AX70V-35KW thermal spraying distance: 80mm.

After thermal spraying, the temperature is 115% in a vacuum or argon atmosphere.
A composite material having a hard alloy in which a hard phase was formed was obtained by maintaining a predetermined temperature C within a temperature range of 0 to 1400° C. for a predetermined time within a time range of 25 to 90 minutes. The obtained composite material was subjected to hardness measurement, Suga type abrasion test, and plastic abrasion test to evaluate its properties. The above test was conducted under the following conditions.

Suga type abrasion test (n Load: 3kgf (2) Reciprocating speed: 3.5m/m1n (3) Mating material:
SiC abrasive paper #320 (4) Number of reciprocations: 400 times Plast abrasion test (1) Plast material: Silica-80# Flow velocity: 177 m/5 (3) Collision angle: 90° (4) Distance: 50++++n 1st The table shows 1. The results of a hard sintered alloy manufactured by the conventional method are also shown for comparison. From the results shown in Table 1, seven hard alloys of the composite material of the present invention.

It is clear that this method has properties equivalent to those of the conventional method.

The comparison materials are ball mill pulverized and powder compacted.

It is integrally molded by liquid phase sintering, and is designated as
This method is based on the method disclosed in No. 57499.

〔Effect of the invention〕

The manufacturing method of the present invention has the same characteristics as the conventional method.

It is easier to change the composition and control the thickness of the hard metal than the conventional method, and it is economically advantageous for making composite materials with complex shapes. Therefore, it is suitable for mass production and has extremely high industrial value.

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view showing the structure of the composite material of the present invention. l: Iron-based metal parts 2; Hard alloy 3: Screw

Claims (1)

[Claims] A method of spraying metal powder onto a ferrous metal member and heating it after spraying to form a hard alloy on the metal member, comprising: (a) the metal powder is Fe-B or Fe- A first step of uniformly mixing the metal powder with B-based alloy powder and single metal powder of Mo, Ni, Cr, B, W, Co, Cu, Si, or alloy powder containing these; (b) the metal; a second step of forming a sprayed layer of 0.1 to 5 mm by spraying the powder onto a ferrous metal member; (c) spraying the sprayed layer in a non-oxidizing atmosphere at a temperature of 1150 to 1
a third step of forming a hard alloy on the iron-based metal member by heating at 400°C, and the formed hard alloy contains 40 to 95% by weight of a hard phase consisting of a complex boride containing Fe. (hereinafter % is weight %) and a binder phase that binds the hard phase, and the complex boride is M_XN_YB type (hereinafter M, N are metals, X, Y are M, N are compounds). represents the stoichiometric value necessary for the formation of Mo and/or
or W, N is composed of Fe and one or more elements selected from Cr, Ni, and Co, and the proportion of Fe in the hard phase is 10 to 22% of the total hard phase, and the binder phase is Fe, and one or more elements selected from Cr, Ni, Co, Cu, and Si, and the content of the one or more selected elements is Cr0.5 to Cr0.5 to the hard alloy. 35% Ni0.5-35% Co0.5-35% Cu0.1-35% Si0.03-4.75%, and is a hard alloy consisting of B3-8% and the balance Fe and inevitable impurities. A method for producing a composite material, wherein the Mo/and/or W content satisfies the atomic ratio of (Mo and/or W)/B from 0.75 to 1.25.