JPS62151558A - Member having corrosion resistant alloy film - Google Patents

Abstract

PURPOSE:To provide a titled member which prevents the material deterioration of the member by the high temp. during the formation of the film and has the improved adhesiveness of the film by having the corrosion resistant alloy film essentially consisting of Co, Cr and W by vacuum deposition on the surface of a base material. CONSTITUTION:An alloy essentially consisting of Co, Cr and W is evaporated in the vacuum in which the partial pressure of Ar and the partial pressure of C2H2 are respectively specified to deposit the vapor of the above-mentioned alloy by ion plating in the vacuum on the surface of the base material (e.g.; SUS410J-1) heated and held to and at 500 deg.C. the film consisting of, for example, Co and the balance 28wt% Cr, 5.1wt% W and 0.9wt% Co is coated on the surface of the base material. The material deterioration of the base material by the formation of the corrosion resistant alloy film is thereby prevented and the adhesiveness of said film is improved. As a result, the life of the member having the corrosion resistant alloy film is considerably extended.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a member having an erosion-resistant alloy coating containing Co, Or, and W as main components.

(Prior art) Conventionally, the surfaces of mechanical parts such as steam turbine blades, pargum screws, and mechanical parts have been exposed to condensate erosion due to steam (for example, wet blades), screw erosion, etc. The deterioration occurs due to the action of erosion, such as corrosion and wear.As a countermeasure to this deterioration, conventionally, Go, which has excellent erosion resistance, was applied to the surfaces of mechanical parts.

(Jr, W-based alloy plates are brazed or stretched using a brazing method, or bars or powder of the alloy components are initially overlaid using overlay welding or thermal spraying methods.

There are the following problems with parts that have been subjected to conventional brazing, overlay welding, and thermal spraying. That is, in each of the above-mentioned construction methods, the construction is performed by heating at a high enough temperature that the base material and coating material, which are metals, melt.As a result, the fatigue limit may be lowered depending on the material of the base material. Therefore, restrictions on strength design become stricter. In addition, concentration segregation of component metal elements may occur in the alloy layer between the base material and the substrate, resulting in deterioration of toughness and strength. Furthermore, the construction method described above is carried out manually in most cases and requires a great deal of labor, resulting in variations in quality performance and a problem of lack of homogeneity of the product.

(Problems to be Solved by the Invention) The present invention eliminates the drawbacks of conventional members having corrosion-resistant alloy coatings, prevents material deterioration of the member due to high temperatures during coating formation, and improves adhesion during grading. The object of the present invention is to provide a member having an corrosion-resistant alloy coating with improved properties.

(Means for Solving the Problems) The present invention provides Co formed on the surface of a base material by vacuum evaporation,
A member characterized by having an erosion-resistant alloy coating containing Cr, 'W as the main components, an Or coating formed on the surface of the base material by vacuum evaporation, and a Co coating formed on the coating by vacuum evaporation. , Or, and an erosion-resistant alloy coating containing W as main components.

(Function) In order to form a sand layer by vacuum evaporation method, the present invention has the following steps:
The base material can be heated at a relatively low temperature of about 500 C, for example, without causing a decrease in the strength of the member. In addition, if the surface of the substrate on which the film is to be formed has formed an inactive oxide film before the treatment, and the partial pressure of water vapor in the vacuum atmosphere during film formation is high, the surface of the substrate will be oxidized. The adhesion of the corrosion-resistant alloy coating may decrease as a result of becoming inert, but by forming a broken film on the surface of the substrate that has a loose affinity for oxygen, 2 when the material surface forms an inert oxide film.
However, since the Or in the Cr test is a component of the corrosion-resistant alloy coating, the bond between the two coatings is also strong. Become.

(Example 1) An alloy mainly composed of Qo, Or, and W was evaporated in a vacuum formed with an Are pressure of 3 x 10 Torr and a C2H2 partial pressure of 1 x 10''4 Torr.
Base material heated and maintained at 0C (SUS 410 J-1)
Vapor of the above alloy was vacuum deposited on the surface of the alloy by ion blasting, and Co, the balance, Or 28 wt%,
A film containing 5.1 wt% W and 0.9 wt% CO was coated.

Figure 1 compares the fatigue strength of the untreated base material SUS 410 J-1, the base material when the coating of the present invention is applied to this material, and the base material when the conventional brazing method is applied. This is the result. In the conventional method, a plate material having a thickness of 0.81 mm and having the same composition as the vacuum-deposited rose-like coating was brazed onto the surface of a 5US410J-1 base material by heating it to 850C. In FIG. 1, there is no difference between the untreated material and the present invention, but it was found that the conventional method had a particularly low fatigue strength and material deterioration.

Similarly, Table 1 is from the cavitation erosion test. These are the results of measuring the amount of weight loss on the surface of the coating. In addition, the cavity τ John erosion test is a test in which an ultrasonic wave with a frequency of 18.3 KRz and a depth of 40 μm is oscillated underwater to generate bubbles, and the bubbles collide with the surface of the broken membrane to test the degree of peeling of the membrane. 18 of the ruptured membrane adhesion test! It is. In this data as well, the method of the present invention yielded good results comparable to the untreated Go-Or-W alloy.

Table 1 Unit (Da) (Example 2) FIG. 2 shows 1flk of the coating structure of the present invention. Return 1 is the material to be coated, 2 is the Cjr coating removal, and 3 is Go.

It is an erosion-resistant coating film of an alloy containing Or, W, Fe C. Extraction 2 and coating 3 were performed as follows.

5US4j in a vacuum with a pressure of 2X10 Torr
The material to be coated 1 of OJ-1 is heated and maintained at 5000℃, Ar gas is supplied into this vacuum, and the partial pressure of this Ar gas is maintained at 3X10 Torr.
was heated and evaporated, and a 6 μm thick Or coating rupture film 2 was formed on the surface of the material to be coated 1 by ion plating. Subsequently, evaporation of Cr is stopped, 1CCH is immediately supplied in this vacuum, the partial pressure of this C2H2 is maintained at 1X 10-'' Torr, and Or
A coating 3 was formed on the surface of the coating 2 by ion blasting by evaporating CO and Fe from an alloy with adjusted CO and Fe components and adjusting the amount of each evaporation. The alloy composition of this coating 3 is Cio balance, Cr 28 wt%, W 5.5 wt%, Fe1.
CI formed by discharging 0wt%, C2H2, 4w
t% and has a thickness of 10 μm.

Figure 3 shows the above two-layer coating film A and, as a comparative example, film 3 in which Or coating film &2 does not exist.
A coating film with the same composition as amB with a thickness of 10 μm
Furthermore, as a comparative example, the results of cavitation erosion tests are shown for alloy C, which was produced by melting and having the same composition as coating 3. According to the results, Invention A exhibits a weight loss comparable to that of Alloy C and exhibits excellent corrosion resistance, but Comparative Example B exhibits the same degree of erosion of the sandbari itself as Alloy A. However, the adhesion of the ruptured membrane was weak and it peeled off, resulting in erosion of the coated material. In addition, the number of eroded areas is coach ink in pure water lol! Cavitation erosion occurs when the abdomen is immersed and subjected to ultrasonic vibrations with a frequency of 5 Km and an amplitude of 40 μm through pure water, and the bubbles generated at that time collide with the surface of the coating and burst. Ijr: Something to be measured.

(Effects of the Invention) By adopting the above configuration, the present invention prevents material deterioration of the base material due to the formation of an erosion-resistant alloy fractured film, improves the adhesion of the film, and as a result, , it was possible to significantly extend the life of a member having an erosion-resistant alloy coating.

[Brief explanation of drawings]

Fig. 1 is a diagram showing fatigue strength test results for members of an embodiment of the present invention and a comparative example, Fig. 2 is a diagram showing an example of a coating structure of the present invention, and Fig. 3 is a diagram showing an example of the structure of a coating of the present invention. It is a figure of the cavitation erosion test result about the member of a comparative example. Sub-Agents 1) Meifuku Agent Ryo Hagiwara - Sub-Agent Atsushi Anzai Fukyoku (Z2・Power (K!j/msu Mitsugu Susumu/l) (mg)

Claims (2)

[Claims] (1) Co, Cr formed on the surface of the base material by vacuum deposition
, a member characterized by having an erosion-resistant alloy coating containing W as a main component. (2) a Cr coating formed on the surface of the base material by vacuum deposition;
A member characterized in that it has an erosion-resistant alloy coating mainly composed of Co, Cr, and W formed by vacuum deposition on the coating.