JPS58172263A - Sio2-cao low expansion flame spray material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal spraying material, particularly to a thermal spraying material for repairing damaged parts of a furnace that undergoes many cycles of heating and cooling coke-4 by large flame spraying.

Recently, flame spraying has been used to repair coke ovens, and it has shown significant effects in terms of repair time, adhesion of the repaired area, and stiffness control. The spraying material used in known flame spraying is a material with a refractory rating of about 70° C. from 0° C. to 810° C.

Is the coke oven made of silica bricks?
The hot tensile strength of this silica brick increases rapidly from 3o'o't to soo'c, and shows the property that it hardly increases at higher temperatures. For this reason, the thermal smoldering resistance of silica bricks used at temperatures above zooo°C is extremely high, but 810.?

Even if the sprayed material of *** is repaired or repaired, this sprayed film will be 1o
Since j1 is stretched linearly up to oo°C knitting, the behavior of hot 1IliI is different from that of the base material silica brick.

For this reason, a gap occurs between the base stone masonry brick and the adhered thermally sprayed film, causing the thermally sprayed film to peel off, resulting in lumps that do not provide sufficient durability.

The aim of this project is to provide a flame sprayed material AT-M which has a very low heat retention rate and has excellent spalling resistance because it behaves in the same way as silica brick silica bricks.

It is a powder compound with 8K particles of 0*1 mm or less, and the accompanying illegal substances are! It weighs less than 1,000 yen, and is attached to the surface by melting or melting it in a large flame made of stirrup gas.

The large flame spray material according to the present invention can be obtained by combining silica stone, silica sand, silicate ore, and CaO-8in-based materials such as Portland cement, otestonite, and calcium silicate. CaO-810, raw materials are preferably Portland cement, alastonite, and guicalcium silicate; CaO cannot be sprayed by large flame spraying;
C1C0, JPCa(OH) is not preferable because it causes a large thermal loss due to the generation of decomposition gas.

As mentioned above, the flame spraying material of the present invention exhibits a behavior similar to the thermal expansion coefficient of silica brick, but when the CaO content is less than 810. Because the melt viscosity of
Since the melt viscosity cannot be lowered by e, the adhesion rate decreases and the bonded sprayed film is not sintered, resulting in a very low strength of the sprayed film itself. CaO/
If the weight is more than j weight, the hot expansivity similar to that of silica glass will disappear and the expansion coefficient will increase linearly, which is undesirable because it will easily cause peeling damage. 810. Is the weight less than 11? 1 weight at-, respectively CaO
When the weight exceeds /j weight and when the weight falls below 1, corresponding defects occur. Impurities! If the weight exceeds the heat, it will not melt in the atmosphere of oxygen and gas, and it will melt.9
This results in loss of moisture, which causes a decrease in the adhesion rate.

The flame spraying material of the present invention solves the disadvantages that 8102 alone has too high a melt particle size, lowers the adhesion rate, and lacks the strength of the sprayed film, by adding a fixed amount of 8102 CaO.
．． By lowering the melt viscosity of the material, the adhesion rate of the refractory body is improved, and the strength of the sprayed film is improved.
It has great significance as a flame spraying material in that it was able to suppress the peeling of the sprayed film by maintaining the same hot melts theory as that of silica bricks. The flame spray material according to the invention can be used to repair in-service furnaces.

The invention will be described below with reference to Examples and Comparative Examples.

Example 1 and Comparative Example 2! A flame spray material having the composition of #3 Makoto was sprayed onto silica bricks according to a conventional method. The results are shown in ): J \ \ \ \ \ * m constant rate at 7000°C Base material / Gar silica brick, 1.200°C - 300°C
Tested 50 times in 73 minutes.

As can be seen from the surface of Kamiayu, the flame sprayed material according to the present invention has good adhesive strength and bending strength, and no peeling from the silica brick was observed even in the heating-cooling thermal cycle test.
It can be seen that the material has superior properties compared to conventional thermal spray materials.

% Applicant: Shirobrick Co., Ltd. Patent applicant: Nippon Kokan Co., Ltd. Patent applicant: Nippon Sanso Co., Ltd. I'm a member of the legal profession.

Claims (1)

[Claims] Essentially 810□gs~9g Sumir-and C1t, I)
A thermal spray material consisting of ~/S weight h9k.