KR20100085965A - Roller for conveying float plate glass, process for producing the same, and process for producing float plate glass with the same - Google Patents

Abstract

A roller for float plate glass conveyance in which, even when a plate glass breaks during annealing, the resultant glass cullet (broken glass pieces) is prevented from burring or marring the roller surface or from sticking in the surface of the roller barrel and thereby causing a defect in the roller surface and which is prevented from marring the plate glass. The roller for float plate glass conveyance has a coating film at least on that surface of the roller barrel which comes into contact with the glass. The coating film comprises: ceramic particles containing a carbide or boride of at least one element selected from the group consisting of Groups Va and VIa; and an alloy comprising cobalt and chromium, the particles having been dispersed in the alloy.

Description

ROLLER FOR CONVEYING FLOAT PLATE GLASS, PROCESS FOR PRODUCING THE SAME, AND PROCESS FOR PRODUCING FLOAT PLATE GLASS WITH THE SAME}

TECHNICAL FIELD This invention relates to the roll for float plate glass conveyance, its manufacturing method, and the manufacturing method of the float plate glass using the same.

In the float method, the plate glass (glass ribbon) shape | molded by the float bath is conveyed by a slow plate cooling process by the float plate glass conveyance roll, and is cooled slowly while conveying.

As such a float plate glass conveying roll, what has a conventional ceramic film, a metal film, and the mixed film of a ceramic and a metal on the surface of a roll trunk part is proposed.

In the following patent document 1, the thermal spray coating of the ceramic is laminated | stacked and formed as an undercoat on the surface of the metal base material of a roll trunk part as a undercoat, and the metal thermal spray coating of the base metal and a ceramic is used for the float glass manufacture The roll is described.

Patent Literature 2 below contains Cr: 10 to 40%, Al: 2 to 20%, Ti: 2 to 20%, Y: 0.1 to 2%, and the balance portion substantially Co on the metal substrate surface of the roll body portion. A roll for float glass manufacture is described, in which a thermal spray coating of a cobalt-based alloy is formed.

In the following Patent Document 3, a spray coating film having a uniform mixed composition of ceramic and metal having a ceramic / metal ratio of 60/40 (weight ratio) or more is formed on the surface of the metal substrate of the roll body. It is described.

And the rolls of patent documents 1-3 have very stable corrosion resistance with respect to the molten tin adhering to a glass ribbon, and there is also little adhesion of tin to the surface, and maintains the smooth surface state for a long time, and the content (耐用) It is described that various effects, such as the significant reduction of roll maintenance, the improvement of line productivity, and the high stabilization of glass quality, are obtained by the improvement of lifetime.

Japanese Patent Laid-Open No. 4-260623 Japanese Patent Laid-Open No. 8-175828 Japanese Patent Laid-Open No. 4-260622

However, when the conventional rolls described in Patent Documents 1 to 3 and the like are used, the cullets (glass fragments) of the plate glass broken during the slow cooling in the slow cooling process cause burrs and scratches on the surface of the roll body, or the rolls It was lodged on the surface of the trunk portion, and as a result, the float plate glass may be scratched by the roll. Especially in the case of the glass substrate for a display, since high quality glass without a scratch etc. is calculated | required, generation | occurrence | production of the scratch by a roll has a big influence on a yield.

MEANS TO SOLVE THE PROBLEM In order to solve the above subjects, this inventor earnestly examines and discovers that the float plate glass conveyance roll which has the coating of the specific alloy in which the specific ceramic particle is disperse solves said subject, and completes this invention. Struck.

This invention is (1)-(8) shown next.

(1) It is a float plate glass conveyance roll which has a film in the part which contact | connects the glass at least on the surface of a roll trunk part, The said film contains carbide or boride of the at least 1 element chosen from the group which consists of group Va and group VIa. The float plate glass conveyance roll which is a film in which ceramic particle is disperse | distributed in the alloy containing Co and Cr.

(2) The alloy contains 50% or more of Co, 15% or more of Cr, and 80% or more of the total of Co and Cr in terms of mass percentage, and the ceramic particles are composed of Groups Va and VIa in mass percentage. The float plate glass conveyance roll as described in said (1) containing 70% or more of carbides or borides of the at least 1 element chosen from.

(3) The said film is a float plate glass conveyance roll as described in said (1) or (2) containing 2-30% of said ceramic particles by mass percentage display.

(4) The said film is a float plate glass conveyance roll as described in said (1) or (2) containing 40-90% of said ceramic particles by mass percentage display.

(5) The float plate glass conveying roll according to any one of (1) to (4), in which the ceramic particles contain tungsten carbide and / or molybdenum carbide.

(6) The float plate glass conveying roll according to any one of (1) to (5), wherein the roll body portion has a flange and has the coating on at least a portion of the surface of the flange in contact with the glass.

(7) The manufacturing method of the float plate glass provided with the process of carrying out slow cooling, conveying the float plate glass of 600 degrees C or less using the float plate glass conveyance roll in any one of said (1)-(6).

(8) The float plate glass conveyance which provides the process of forming a film by the HVOF spraying method in the part which contact | connects the glass at least on the surface of a roll trunk part, and obtains the roll for float plate glass conveyance in any one of said (1)-(6). Method for producing a roll for use.

If the float sheet glass conveying roll of the present invention is used in a slow cooling process, even if the sheet glass is broken during slow cooling, the cullets (glass fragments) of the broken glass will burn off the surface of the roll and cause scratches, or may be embedded in the surface of the roll to Problems with the surface are prevented. Therefore, the plate glass is prevented from being scratched due to the problem of the roll surface, and stable glass quality can be ensured. It is especially effective for manufacture of glass for display substrates.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic side view of the preferable form of the roll of this invention.
2 is a schematic cross-sectional view of a preferred embodiment of the roll of the present invention.
3 is a schematic view for explaining an oxidation resistance and sulfidation resistance evaluation test.
4 is a schematic view for explaining a test for sticking and adhesion of a cullet;
5 is a schematic view for explaining a friction characteristic evaluation test for scratching characteristics on glass and glass.
Fig. 6 is a graph showing the number of cullets per unit area in the culling adhesion and adhesion test.
7 is a graph showing a measurement result of Vickers hardness.
8 is a graph showing an average friction coefficient measurement result.

The present invention will be described in detail.

This invention is a float plate glass conveyance roll which has a film on at least one part of the surface of a roll trunk part, The said film is ceramic particle containing the carbide or boride of the at least 1 element chosen from the group which consists of group Va and group VIa. It is a float plate glass conveyance roll which is a film disperse | distributed in the alloy containing Co and Cr.

Such a roll for glass plate conveyance is also called "roll of this invention" below.

First, the film which the roll of this invention has is demonstrated.

In the roll of the present invention, the film is a film in which specific ceramic particles are dispersed in an alloy containing Co and Cr (hereinafter also referred to as "Co-Cr alloy").

Although the content rate of Co and Cr in Co-Cr alloy is not specifically limited, It is preferable to contain 50% or more of Co and 15% or more of Cr by the mass percentage display, and to contain 80% or more of Co and Cr in total ( Hereinafter, when describing simply as "%", unless otherwise indicated, a mass percentage display (mass%) shall be meant). It is because peeling of a film can be suppressed because high corrosion resistance can be maintained and adhesiveness with a base material becomes high.

Here, it is more preferable that the sum total of Co and Cr is 85% or more, and it is still more preferable that it is 90% or more.

Moreover, it is more preferable that Co is 60% or more, and it is still more preferable that it is 65% or more.

Moreover, it is more preferable that Cr is 20% or more, and it is still more preferable that it is 25% or more.

Although the remainder component other than Co and Cr in the said Co-Cr alloy is not specifically limited, For example, what is necessary is just Fe, Ti, and Ni.

In the roll of this invention, a film is a film in which the specific ceramic particle demonstrated below is disperse | distributed in this Co-Cr alloy.

The ceramic particles include carbides or borides of at least one element selected from the group consisting of Groups Va and VIa. That is, vanadium carbide, niobium carbide, tantalum carbide, dubium carbide, chromium carbide, molybdenum carbide, tungsten carbide (tungsten carbide, etc.), carbon carbide, vanadium boride, niobium boride, tantalum boride, dopium boride, chromium boride, And ceramic particles containing at least one selected from the group consisting of molybdenum boride, tungsten boride, and borium borosilicate. Since the ceramic particles are firmly bonded to the Co-Cr alloy and the coating properties such as hardness and sinterability are improved, the cullets of the broken glass are cut off on the surface of the roll body, causing scratches, or the surface of the roll body. Getting hit less.

Among these, tungsten carbide and / or molybdenum carbide are preferable. Examples of tungsten carbide include WC and W ₂ C.

It is preferable that the content rate of the carbide or the boride of the at least 1 element chosen from the group which consists of group Va and VIa in the said ceramic particle is 70% or more, It is more preferable that it is 85% or more, It is more preferable that it is 95% or more, It is more preferable to contain substantially 100%, ie, other than unavoidable impurities.

The remainder components other than carbides or borides of at least one element selected from the group consisting of Groups Va and VIa in the ceramic particles are not particularly limited, but for example, Co and / or unavoidable impurities, and their C It may be a compound with at least one selected from the group consisting of, O and B.

Although the particle diameter of the said ceramic particle is not specifically limited in the said film, It is preferable that it is 0.2-20 micrometers in an average particle diameter, and it is more preferable that it is 0.5-10 micrometers.

It is preferable that the said ceramic particle is disperse | distributed uniformly in the said film. This is because the strength is higher.

In the roll of the present invention, the coating preferably contains 2 to 90% of the ceramic particles in the Co-Cr alloy. As for this content rate, it is more preferable that it is 2 to 30% or 40 to 90%, It is more preferable that it is 3 to 15% or 60 to 90%, It is further more preferable that it is 4 to 10% or 80 to 88%. If it is 2 to 30%, it is excellent in the surface smoothness and peeling resistance, and it is suitable when the surface smoothness etc. are especially requested | required with respect to glassware. If it is 40 to 90%, it is excellent in abrasion resistance and is suitable when the durability of a film is especially requested | required.

Among these films, 4 to 10% of ceramic particles having an average particle diameter of 0.5 to 10 占 퐉 substantially consisting of tungsten carbide and / or molybdenum carbide, preferably tungsten carbide, are not included in addition to other unavoidable impurities. The Co-Cr alloy is substantially composed of Co and Cr, and the Co content of Co in the Co-Cr alloy is 65 to 75%, and the ceramic particles and the Co-Cr alloy form a dispersion strengthening alloy. It is preferable that it is a film (this film is also called "film alpha" below).

Although the thickness of a film in the roll of this invention is not specifically limited, It is preferable that it is 0.05-1 mm, and it is more preferable that it is 0.1-0.5 mm. It is because when it is too thin, a film | membrane characteristic cannot fully be exhibited, and when too thick, adhesiveness will fall.

In addition, the thickness of a film shall mean the value computed from the difference by measuring the thickness of the base material before spraying, and the thickness after spraying and polishing using a micrometer or a rags.

In addition, although the film in the roll of this invention can be formed by the method of mentioning later, it is preferable that it is formed in the surface of a roll trunk part by HVOF spraying method (high-speed flame spraying method). The coating film preferably contains 2 to 30% or 40 to 90% of the ceramic particles in the Co—Cr alloy, and is more preferably formed by HVOF thermal spraying. Moreover, it is more preferable that the said film is the above-mentioned film (alpha), and is formed by the HVOF spraying method.

The roll of this invention has such a film in the part which contact | connects at least glass of the surface of a roll trunk | drum.

It is preferable that the roll of this invention has the said film in both the part which contacts the plate glass of the surface of a roll trunk | drum. When the roll of this invention has a flange in a roll body part as demonstrated below, since a flange contacts a plate glass, it is preferable to have a film on the surface of a flange.

Next, parts other than the said film in the roll of this invention are demonstrated.

In the roll of this invention, parts other than the said film are not specifically limited, For example, what is necessary is just the same as the thing of the conventional float plate glass conveyance roll. The size, material, shape, and the like are also not particularly limited, and may be the same as conventional ones such as stainless steel. For example, what is necessary is just to attach a shaft to the roll trunk part which is a cylindrical body which consists of alloy steels, such as stainless steel, but it is preferable to have a flange on the surface of the roll trunk part of a cylindrical body. This is because reducing the contact point reduces the generation of scratches, and by reducing the heat absorption from the glass, stress relaxation and the like can be obtained.

The roll of this invention of this preferable form is demonstrated using drawing.

FIG. 1: is a schematic side view of the float plate glass conveyance roll which has a flange on the surface of a roll trunk | drum, and FIG. 2 is a schematic sectional drawing.

In Fig. 1 and Fig. 2, reference numeral 11 denotes a roll body portion which is a metal substrate, 12 denotes a flange of the surface of the roll trunk portion 11, 13 denotes the coating formed on a portion in contact with the float plate glass of the surface of the flange 12, 15 is a shaft attached to the roll body portion 11.

The length of each part, the number of flanges, etc. are not specifically limited. For example, the length L1 of the longitudinal direction (axial direction) of the roll trunk | drum 11 is 4,000-6,000 mm, and the diameter L2 of the cross section in the direction perpendicular | vertical to a longitudinal direction is 200-400 mm, a flange The height L3 from the roll trunk part 11 surface of (12) is 4-10 mm, and the width L4 of the flange 12 in the direction parallel to the longitudinal direction of the roll trunk | drum 11 is 20 To 60 mm and the pitch L5 of the flange 12 can be 100 to 300 mm.

Here, it is preferable that L3 is 5-7 mm. It is preferable that L4 is 30-50 mm. It is preferable that L5 is 150-250 mm. This is because even if the plate glass to be conveyed is thin, the warpage of the plate glass is small between the flanges and the formation of scratches on the plate glass can be suppressed by contacting the flange.

In addition, although the shaft 15 was attached to the roll trunk part 11 of a cylindrical body in FIG. 1, FIG. 2, the roll trunk | drum and the shaft were integrally cast, etc. may be sufficient. In addition, the flange and the roll body may be integrally cast.

Next, the manufacturing method of the roll of this invention is demonstrated.

The manufacturing method of the roll of this invention is not specifically limited. For example, a cylindrical body obtained by machining a centrifugal casting tube as a body portion is used as a body portion, and in the case of having a flange, a flange is welded to the surface thereof and mounted. Then, the film is formed on at least the surface in contact with the glass by a thermal spraying method such as flame spraying (HVOF), explosion spraying, arc spraying, plasma spraying, linewidth spraying, and the like. do. Then, the shaft is pulled in and mounted from the opening in the longitudinal end of the cylindrical body.

The trunk portion may be formed by another method as long as it is a cylindrical body.

In addition, the material of a flange may be the same as a trunk part, and may differ.

Moreover, the manufacturing method and material of a shaft are not specifically limited, either. The thing of the conventionally well-known material formed by the conventionally well-known method may be sufficient.

In this way, the roll of this invention can be manufactured.

According to the manufacturing method of the float plate glass provided with the process of carrying out slow cooling, conveying using the roll of this invention for carrying out the float plate glass of 600 degrees C or less, since the float plate glass with very few scratches is obtained, it is preferable. It is more preferable that the float glass is 500 degrees C or less here, and it is still more preferable that it is 430 degrees C or less. This is because plate glass with less scratches is obtained. Although the roll of this invention can be used also by conveyance at normal temperature, it is preferable to use for the conveyance of the float plate glass of 150 degreeC or more which becomes difficult to use a resin roll.

The manufacturing method of such a float plate glass may be the same as the manufacturing method of the conventional float plate glass except using the roll of this invention in order to convey the float plate glass of 600 degrees C or less.

For example, after supplying a glass raw material to a molten kiln set at about 1,600 ° C. to obtain a molten glass, the molten glass is poured into a float bath filled with molten tin to form a plate glass, discharged from the float bath, and supplied to a slow cooling furnace. The manufacturing method of carrying out slow cooling while conveying the plate glass by the roll of this invention is mentioned. The temperature of the plate glass in the inlet vicinity of a slow cooling furnace is about 700 degreeC normally. You may convey plate glass using the roll of this invention only in the area | region where the temperature of plate glass becomes 600 degrees C or less. As a roll of this invention, it is preferable to use what has the above-mentioned flange.

Although the kind, size, thickness, etc. of the plate glass to which the manufacturing method of the float plate glass using such a roll of this invention are applicable are not specifically limited, For display of thickness 0.3-3 mm, Preferably 0.3-0.8 mm, Preferably It can apply suitably in order to manufacture the alkali free glass plate for liquid crystal displays. Scratches to glass can be suppressed by conveying and slow cooling using the roll of this invention. If the roll of this invention has the flange mentioned above, the effect will become more remarkable.

<Examples>

Hereinafter, although this invention is demonstrated in detail with reference to an Example, this invention is not limited to these Examples.

Five types of things shown in Table 1 were prepared as a thermal spraying raw material. Each raw material was given the symbol "A" through "E". In addition, the thermal spray raw material species of Table 1, for example, in the case of the notation "Co-28% Cr-4% W-1% C" in Example 1, Cr is 28%, W is 4%, C is 1% and the remainder are Co.

Each of these raw materials was sprayed with a flat plate made of SUS316L (hereinafter also referred to as "substrate") to prepare a test piece. And these test pieces and the thing which did not spray the raw material (plate made from SUS329J1) (Comparative example 3), the oxidation-resistance-sulfurization evaluation test shown below, the culling and adhesion evaluation test of a cullet, the friction characteristics with respect to glass • It provided four types of tests, the flaw generation characteristic evaluation test to glass, the tendency of a burr, and the flaw generation evaluation test.

In addition, Table 1 shows the thermal spraying method applied at the time of thermal spraying to the base material of each raw material. These spraying methods will be described.

"APS" in Table 1 means "atmospheric plasma spraying method." The thermal spraying apparatus used Matco Corporation on normal conditions.

In addition, when spraying the thermal spraying raw materials B, C, and E by the HVOF spraying method, the thermal spraying apparatus used JP5000 (made by the FOX company) on normal conditions.

<1. Oxidation resistance and sulfidation evaluation test>

Each raw material shown in Table 1 was sprayed by the thermal spraying method shown in Table 1 to one main surface of the base material made from SUS316L of thickness 25mm * 25mm * 6mm. The sprayed surface was polished with water resistant abrasive papers (# 80 to # 1200).

Let the test piece which sprayed the thermal spray raw materials A-E obtained here be the test piece A1-E1. In addition, the plate made from SUS329J1 which did not spray the thermal spraying material is made into the test piece F1.

The test shown next was done using test piece A1-E1.

3 shows a schematic of this test.

Each test piece 18 was put on the porous brick 17 provided in the tubular furnace 16, the gas containing oxygen, sulfurous acid gas, and water vapor was introduce | transduced, and the test which evaluated corrosion resistance in high temperature environment was done.

Specifically, each test piece 18 on the alumina porous brick 17 (length 100mm, width 50mm, height 10mm) inside the tubular furnace 16 (full length: 1,200 mm, the cross section is 100 mm in diameter). ), The tubular furnace 16 was heated up at 5 ° C / min. And at the part where the temperature inside the tubular furnace 16 became 200 degreeC, the gas 19 containing oxygen, a sulfurous acid gas, and water vapor is started to introduce, and the temperature in the tubular furnace 16 is 450 degreeC. The temperature in the tubular furnace 16 was maintained in the furnace part, and it kept at this temperature for 100 hours. Thereafter, the temperature was lowered to 5 ° C./min, and the introduction of the gas 19 containing oxygen, sulfurous acid gas and water vapor was stopped at the portion where the temperature in the tubular furnace 16 became 200 ° C., The temperature was lowered at the same speed until

In this test, the gas 19 containing oxygen, sulfurous acid gas, and water vapor as a gas 19 having O ₂ of 13%, SO ₂ of 0.1%, H ₂ O of 4% and the balance of N ₂ at 765 cc / min. Introduced.

And the cross section observation of the film of each obtained test piece 18 and elemental analysis of the cross section were performed.

<1-1> section observation

After cutting the test piece with the blade type cutter, the cross section was observed using the scanning electron microscope (brand name: S-3000H, the Hitachi Seisakusho company).

<1-2> Elemental Analysis of Cross Section

It carried out about three places of the surface part in a film, the film thickness direction center part, and the interface part with the base material in a film. As the analyzer, EDS (trade name: INCA Energy, manufactured by Oxford Instruments) was used.

<2. Evaluation of Peel and Adhesion of Curlets>

The test piece was produced by the same method as the above-mentioned 1. oxidation resistance and sulfidation resistance evaluation test. The obtained test piece was made into the test piece A2-F2 according to the kind of spraying raw material. Here, let A2 be the same kind of thermal spraying raw material as A1. The same applies to B2 to F2, A3 to F3, and A4 to F4 described later.

For the first time, after breaking the plate glass using a mortar, it is shaken using a sieve of 250 µm and 500 µm to collect 250 to 500 µm, and the particle size is adjusted to 250 to 500 µm by repeating the operation of breaking the excess exceeding 500 µm. Obtained cullets.

Next, the test was performed by the method shown in FIG. 4 using the obtained cullet. The whole apparatus shown in FIG. 4 is installed in the heating furnace not shown. This test was performed using a sentence type tensilon universal testing machine (form: Tensilon, made by A & D Corporation). As shown in Fig. 4, after the plate 23 made of alumina is placed on the pedestal 21 substantially horizontally, and 0.05g of the cullet 25 is uniformly placed thereon so that the cullets do not overlap, the thermal spraying of each test piece is carried out. The coating 27 was disposed substantially horizontally in contact with the cullet 25. Then, the temperature of the test piece was raised to 450 ° C. in 1 hour, held at 450 ° C. for 15 minutes, and thereafter, the surface of the substrate 29 of the test piece was pressed downward through the pressing part 31. . The pressurization speed was 0.35 mm / min, and when pressure became 1 kg / cm <2>, it was hold | maintained for 10 second, and pressure was removed after that. Then, after 45 minutes had elapsed since the start of pressurization, the temperature was lowered to room temperature in 1 hour.

And the number of cullets stuck to the surface in each test piece which cooled to room temperature was counted, and the number of cullets per unit area was computed. In addition, the Vickers hardness of the surface of each test piece after temperature fall was measured. The measuring method was based on JISZ2244.

<3. Evaluation of Friction Characteristics on Glass and Scratches in Glass>

<3-1> Wear property test for glass

After spraying each thermal spray raw material on the base material of SUS316L of the disk shape of thickness 10mm and 28mm in diameter by each spraying method shown in Table 1, the thermal spraying surface was ground using water-resistant abrasive paper and the surface roughness of all test pieces (Ra ) Are approximately the same and the mass is approximately the same. The obtained test piece after grinding | polishing was made into test piece A3-F3 according to the kind of spraying raw material.

Table 2 shows the surface roughness, mass, and total mass of the holder and the test piece.

Next, the test which evaluates the friction characteristic with respect to glass and the flaw generation characteristic to glass was performed by the method shown in FIG. The whole apparatus shown in FIG. 5 is provided in the heating furnace not shown.

The test piece 44 was inserted in the holder 42 made of stainless steel connected to the wire 40. As shown in FIG. 5, the coating surface 45 of the test piece 44 was provided on the alumina plate 46 so as to contact the alumina plate 46 with the lower side.

Then, the temperature of the entire apparatus shown in FIG. 5 is heated to 450 ° C. in 1.5 hours, maintained at 450 ° C. for 15 minutes, and thereafter, the wire 40 connected to the holder 42 in the state of 450 ° C. ), The alkali free glass plate 48 provided at the same height as the alumina plate 46 was made to slide. And the average friction coefficient was calculated | required by measuring the average load applied to the wire 40.

<3-2 scratch generation characteristic evaluation test to glass>

After the temperature was lowered to room temperature, the surface of each glass plate 48 after each test piece was slipped was visually observed.

<4. Easiness of burr and scratches Evaluation test>

Using test surface A4 (brand name: 14FW, the Shinto Chemical Co., Ltd.), the test piece A4-F4 were scratched on the film surface by the load of 200 g by the sapphire pin at 450 degreeC. And the shape of the surface was observed using the laser microscope.

Next, the result of each test is shown.

<1. Oxidation resistance and sulfidation evaluation test results>

<1-1 cross section observation>

In the test piece D1 after the test, a crack occurred between the coating film and the substrate.

There was no change in other test pieces before and after the test.

<1-2 elemental analysis>

As a result of performing elemental analysis in the film cross section of each test piece, sulfur was detected in the interface part of a film and a board | substrate in D1. This is considered to be because the concave hole having a diameter of about 0.1 mm or less and the hole communicating with the base material are relatively scattered on the surface of the film. Therefore, it is thought that D1 tends to corrode a base material and peels easily by an interface crack.

<2. Test result of nailing and adhesion

The graph which shows the number of cullets per unit area is shown in FIG. Curlets were embedded in Test Pieces A2, D2, and F2, while Curlets were not embedded in Test Pieces B2, C2, and E2.

The measurement result of Vickers hardness is shown in FIG. Test pieces C2 and E2 had high Vickers hardness, while test pieces A2 and F2 were low. From these results, it is thought that a material with a low Vickers hardness is comparatively easy to get curled.

However, although the test piece D2 had the Vickers hardness to some extent, the amount of curling was also large. It is considered that this is because a concave hole having a diameter of about 0.1 mm or less is relatively scattered on the surface of the film.

<3. Test results for evaluation of frictional characteristics of glass and scratches on glass>

<3-1 Friction force measurement result for glass>

The average friction coefficient is shown in FIG. It can be seen that the friction coefficients of the test pieces A3, C3, and E3 are as low as 0.3 or less.

<3-2 scratch generation characteristic evaluation test result to glass>

Table 3 shows the results of confirming the surface of the glass on which each test piece was slid.

Factors in which the degree of flaw formation differs depending on the material of the film include, in addition to the difference in the fine surface shape by the material, the shape of the dropped particles (particles dropped from the film), the behavior of the dropped particles, and the surface after the dropped particles fall off. It is estimated that it is based on the characteristic peculiar to coating materials, such as shape.

<4. Easiness of burr and scratches Evaluation test result>

As a result of observing the surface after scratching the film surface using a sapphire pin, the test piece A4 and F4 had deep scratches, and large burrs were generated. On the other hand, in the test piece B4, C4, D4, and E4, even if a scratch was cut off, it hardly generate | occur | produced.

Although this invention was detailed also demonstrated with reference to the specific embodiment, it is clear for those skilled in the art that various changes and correction can be added without deviating from the mind and range of this invention.

This application is based on the JP Patent application 2007-288548 of an application on November 6, 2007, The content is taken in here as a reference.

The float plate glass conveying roll of the present invention is hard to be burned off or scratched on the surface of the roll body by the cullet of the plate glass broken during slow cooling, and the cullet is hard to get stuck on the surface of the roll body. Scratches can be prevented from occurring in the plate glass. In particular, in the case of the glass substrate for a display, a yield improves significantly with reduction of generation | occurrence | production of a scratch.

11: roll torso
12: flange
13: film
15: axis
16: tubular furnace
17: porous brick
18: test piece
19: gas
21: pedestal
23: plate made of alumina
25: cullet
27: Champion's Film
29: description
31: pressurization
40: wire
42: holder
44: test piece
45: film surface
46: alumina plate
48: alkali free glass plate

Claims (8)

It is a float plate glass conveyance roll which has a film in the part which contact | connects at least the glass of the surface of a roll trunk part,
The said film is a float plate glass conveyance roll which is a film | membrane in which the ceramic particle containing the carbide or boride of the at least 1 element chosen from the group which consists of group Va and VIa is disperse | distributed in the alloy containing Co and Cr. The alloy according to claim 1, wherein the alloy contains 50% or more of Co, 15% or more of Cr, and 80% or more of the total of Co and Cr in terms of mass percentage,
And said ceramic particles contain 70% or more of carbide or boride of at least one element selected from the group consisting of Groups Va and VIa in terms of mass percentage. The said plate | board is a float plate glass conveyance roll of Claim 1 or 2 which contains 2 to 30% of said ceramic particles by mass percentage display. The said plate | board is a float plate glass conveyance roll of Claim 1 or 2 which contains 40-90% of said ceramic particles in a mass percentage display. The float plate glass conveying roll of any one of Claims 1-4 in which the said ceramic particle contains tungsten carbide and / or molybdenum carbide. The float plate glass conveying roll according to any one of claims 1 to 5, wherein the roll body portion has a flange and has the coating on a portion in contact with at least glass on the surface of the flange. The manufacturing method of the float plate glass provided with the process of carrying out slow cooling, conveying the float plate glass of 600 degrees C or less using the float plate glass conveyance roll of any one of Claims 1-6. Of the float plate glass conveyance roll which comprises the process of forming a film by the HVOF spraying method in the part which contact | connects the glass at least on the surface of a roll trunk part, and obtains the float plate glass conveyance roll in any one of Claims 1-6. Manufacturing method.

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