JPH053417B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a spinner foil in a fiberizing device for producing rock wool or slag wool (hereinafter simply referred to as rock wool) by utilizing the centrifugal force of a rotating body. [Prior Art] One method for obtaining rock wool is to melt an inorganic composition blended with the same composition as the rock wool obtained in an electric furnace or cupola furnace, and then
This molten metal is supplied to the circumferential surface of two to four metal hollow bodies that are fixed on a horizontal rotating shaft and rotating at high speed, and then placed in a high-speed air stream from around the circumferential surface of the hollow bodies. There is a fiberization method in which a fibrous material is obtained by projecting This fiberizing method is known as a method for efficiently obtaining rock wool of good quality. The metal hollow body used in the above-mentioned rock wool production method is called a spinner foil for rock wool production, and is usually made of carbon steel (SS) in the form of a cylinder, cone, or truncated cone.
The above-mentioned molten metal is supplied to the circumferential surface of a hollow body which is rotated at high speed. [Problems to be Solved by the Invention] The above spinner foil for producing rock wool, which is made of a hollow metal body, has the purpose of increasing the life of the spinner foil itself and stabilizing the quality of the rock wool obtained. The rotating shaft of the spinner foil and the inside of the hollow body are cooled with water refrigerant, but corrosion tends to occur on the circumferential surface of the spinner foil, which is the supply surface of the molten metal. It is replaced every 100 to 200 hours. For this reason, replacing the spinner foil is troublesome. In addition, if you continue to use a spinner foil whose circumferential surface is corroded, the molten metal will not adhere to the circumferential surface of the spinner foil sufficiently, and the centrifugal force necessary for fiberization will not be applied to the molten metal sufficiently. As a result, the fiber diameter distribution of the resulting rock wool becomes wide, and the content of non-fibrous material (shot) increases, making it impossible to obtain high-quality rock wool. In contrast, the present invention has a long service life, allows efficient production of high-quality rock wool with a narrow fiber diameter distribution and low content of non-fibrous substances, and is easy to manufacture. To provide a spinner foil for producing rock wool having characteristics. [Means for Solving the Problems] The spinner foil for producing rock wool of the present invention has a coating layer on at least the circumferential surface of a cylindrical or conical hollow metal body that has both heat resistance and corrosion resistance. The coating layer is coated with
A lower layer made of a sprayed metal layer directly laminated on a hollow metal body, an intermediate layer made of a sprayed cermet layer laminated on the lower layer, and a sprayed ceramic layer laminated on the intermediate layer. It is formed by an upper layer. In the spinner foil for producing rock wool of the present invention having the above configuration, the thickness of the coating layer covering at least the circumferential surface of the metal hollow body varies depending on the material of the coating layer, but generally Generally, 0.1 mm or more, preferably 0.5 mm or more is sufficient. The lower layer, which is a sprayed metal layer directly laminated on the metal hollow body, is made of stainless steel, tungsten, molybdenum, nickel, tantalum, cobalt, chromium, and alloys thereof. Further, the intermediate layer consisting of the sprayed cermet layer laminated on the lower layer is formed of a mixture of each of the above-mentioned metals and a carbide or nitride of titanium, zirconium, boron, silicon, niobium or the like. Furthermore, the upper layer consisting of a sprayed ceramic layer laminated to the middle layer is made of alumina, chromium oxide,
It is formed of zirconia, magnesia, titania, stabilized zirconia stabilized with ittria, magnesia, etc., magnesia/alumina spinel, etc. alone or in a mixture. A lower layer consisting of a thermally sprayed metal layer directly laminated on a metal hollow body, an intermediate layer consisting of a thermally sprayed cermet layer laminated on the lower layer, and a thermally sprayed ceramic layer laminated on the intermediate layer, Oxygen/acetylene (or hydrogen) for each specified material
Explosive thermal spraying involves melting the material with a flame and spraying it at high speed; similarly, a specified material is melted with a high-temperature, high-speed plasma flow created by a non-transfer arc and a thermal pinch effect, and the material is sent flying at the speed of sound. Plasma spraying method in which the material is bombarded with a predetermined location;
It is formed by an arc spraying method or the like in which metals are melted using an arc heating method and then sprayed at a predetermined location at high speed. Note that the plasma spraying method is most suitable because the material for forming the coating layer can be arbitrarily selected and the sprayed layer obtained is dense. [Function] The spinner foil for producing rock wool of the present invention has a cylindrical or conical hollow metal body whose at least the circumferential surface is coated with a coating layer having both heat resistance and corrosion resistance. The coating layer is
A lower layer made of a sprayed metal layer directly laminated on a hollow metal body, an intermediate layer made of a sprayed cermet layer laminated on the lower layer, and a sprayed ceramic layer laminated on the intermediate layer. It is formed by an upper layer. As described above, the coating layer in the spinner foil for producing rock wool of the present invention having such a configuration includes a lower layer consisting of a metal radiation layer directly laminated on a metal hollow body, and a cermet layer laminated on the lower layer. Because it is formed of an intermediate layer consisting of a thermally sprayed layer and an upper layer consisting of a ceramic thermally sprayed layer laminated on the intermediate layer, the difference in dimensional change rate due to heat between the metal hollow body and the coating layer The resulting thermal distortion of the coating layer is suppressed, and the adhesive force of the coating layer to the metal hollow body is strong, and
The adhesion between the coating layers is also strong. In addition, in the coating layer of the spinner foil for producing rock wool of the present invention, since both the intermediate layer and the upper layer of the coating layer are formed of layers having a lower thermoelectric conductivity than metal, the circumferential surface of the spinner foil is The heat of the supplied molten metal is difficult to conduct inside the spinner foil, and the middle layer and the upper layer serve to lower the temperature by providing a heat insulating layer. Due to these features, the service life of the spinner foil for producing rock wool according to the present invention is greatly increased. Furthermore, in the spinner foil for producing rock wool of the present invention, since the upper layer that comes into direct contact with the molten metal, which is the raw material for producing rock wool, is formed of ceramic, the wetting property of the molten metal on the surface of the spinner foil is high, and it can be rotated at high speed. The molten metal supplied to the circumferential surface of the spinner foil is well spread over the circumferential surface, and sufficient centrifugal force is applied to the molten metal. Therefore, it is possible to produce extremely high-quality rock wool that has a small fiber diameter, a narrow fiber diameter distribution, a large fiber length, and a low content of non-fibrous substances. [Example] Hereinafter, the specific structure of the spinner foil for producing rock wool of the present invention will be explained together with the process of producing rock wool using the spinner foil. In the rock wool production process shown in the figure, an inorganic composition blended to have the composition of the resulting rock wool is melted in an electric furnace 1, and the resulting molten metal 2 is rotated by a spinner foil 3 rotating at high speed. Air is supplied to the circumferential surface 4 of the spinner foil 3 via a trough 5 and from a high-speed air supply port 6 installed slightly behind the spinner foil 3 in the main direction of the circumferential surface 4 of the spinner foil 3. The molten metal 2 is in a high-speed air stream that is ejected almost parallel
is projected from the periphery of the spinner foil 3 to achieve fiberization. The spinner foil 3 is a circumferential hollow body, and the interior thereof is heated by cooling water supplied through a refrigerant circulation pipe provided by using the installation space of the refrigerant circulation pipe indicated by reference numeral 7. It is said to be a water-cooled system. Example Spinner foil 3 is a carbon steel (SS) cylindrical body with a diameter of 150 mm, a cylinder length of 75 mm, and a wall thickness of 25 mm.A lower layer made of Nitsuchem chromium alloy and magnesium zirconate mainly composed of Nitsuchem chromium alloy are applied to the circumferential surface of a cylindrical body made of carbon steel (SS) with a diameter of 150 mm, a cylinder length of 75 mm, and a wall thickness of 25 mm. a first intermediate layer consisting of a mixture of components;
Nitschem's main ingredient is magnesium zirconate.
A spinner foil was used having a second intermediate layer made of a mixed component of a chromium alloy and an upper layer made of a magnesia-itria stabilized zirconia mixture, each of which was formed by a plasma spraying method. Note that the thickness of the coating layer is 0.5 mm. In the rock wool manufacturing process shown in the drawing, two spinner foils 3, 3 are attached to a horizontal rotating shaft in parallel in the rotational direction with a distance of 10 mm between their circumferential surfaces, and a A high-speed airflow with a wind speed of approximately 100 m/sec was activated. Using the rock wool manufacturing process consisting of the steps above, SiO ₂ 40-42%, AlO ₃ 12-14%,
About 1600 The circumferential surface 4 of the spinner foil 3, which is melted in the electric furnace 1 at ℃ and rotated at 6000 rpm, is heated to a temperature of 1450~
Supplied as molten metal at 1470℃ and a flow rate of 1.5 to 1.6 T/hr.
Manufactured rock wool. For comparison, rock wool was produced in the same manner as in the previous example except that a spinner foil consisting of a cylindrical body made of SS without a coating layer was used. The properties of each rock wool at the time of one hour of operation are shown in the table below for the rock wool production operation in the above example and the rock wool production operation carried out for comparison.

[Table] In addition, when the rock wool manufacturing process explained in the above example and the rock wool manufacturing process for comparison were each continuously operated for 100 hours, the circles of the spinner foil used in the rock wool manufacturing process for comparison were The circumferential surface has a depth of about 3 mm and a width of about 14 mm.
Although an eroded portion extending over a length of mm had occurred, there was no eroded portion at all on the circumferential surface of the spinner foil used in the rock wool manufacturing process in the example. [Effects of the Invention] According to the spinner foil for producing rock wool of the present invention, the spinner foil has a long service life, and moreover, the molten metal, which is the raw material for producing rock wool, is supplied to the ceramic layer surface of the spinner foil. , it is possible to effectively produce extremely high quality rock wool with small fiber diameter, narrow fiber diameter distribution, large fiber length, and low content of non-fibrous substances.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating the outline of the rock wool manufacturing process using the spinner foil for rock wool manufacturing of the present invention, and FIG. 2 is a sectional view taken along the line -- in FIG. 1. 3: spinner foil, 4: circumferential surface of spinner foil 3.

Claims (1)

[Claims] 1. A spinner foil for manufacturing rock wool, in which at least the circumferential surface of a cylindrical or conical hollow metal body is coated with a coating layer having both heat resistance and corrosion resistance, wherein the coating layer is made of metal. A lower layer consisting of a thermally sprayed metal layer laminated directly on the hollow body, an intermediate layer consisting of a thermally sprayed cermet layer laminated on the lower layer, and an upper layer consisting of a thermally sprayed ceramic layer laminated on the intermediate layer. A spinner foil for manufacturing rock wool, characterized by being formed of.