TWI403477B - Preparation of Surface Porous Glass Ceramics - Google Patents

Abstract

The invention discloses a method for preparing glass ceramic with porous surface mainly comprising steps of coating a powder on the glass surface after firstly cleaning the glass surface, putting the glass into a microwave field for heating so that the powder is oxidized on the surface of the glass ceramic to form plural bubbles, applying crystal heat treatment to the glass, cooling the glass, and removing the glass from the microwave field to form a plurality of pores on the glass surface.

Description

Surface porous glass ceramic manufacturing method

The invention relates to a method for preparing a glass ceramic, in particular to a method for producing a surface porous glass ceramic.

At present, it is known that the process of generally porous glass ceramics needs to melt the glass ceramic raw material at a high temperature, and then inject the molten glass into a mold to produce a porous glass ceramic. Since the melting point of the glass is high, it takes too much in the heating process. Time, so directly into the molten glass into the mold, it takes a lot of time and manpower.

Porous materials have been widely used, and the application requirements are also more and more complicated. However, in the past, porous materials were mainly made of bulk materials, resulting in low mechanical strength and breaking strength, and short service life. In the manufacturing process, it is necessary to establish a relationship between sufficient strength and the pore structure, and the manufacturing method, particularly the microporous material manufacturing method, is still complicated, and it is difficult to mass-produce. Both pore size and porosity adjustment and control are difficult to develop process methods that can accurately control pore structure, pore size, and distribution or pore structure with specific orientation. For porous materials that require special use, it is necessary to meet the requirements of practical application. It is more complicated.

The surface porous material has novelty and development value, provides the problem that the porous material cannot be used together with other materials in the past, and the bottleneck in material design and manufacture. The surface porous design will further make more novelty and progress. Sexuality makes porous materials limited by the past, towards new material design and combination applications, and expects to bring more benefits and industrial integration development in application design in the future. Making porous materials not limited to blocks The material and the plate are limited, and have the function of designing the zone.

Therefore, for the design and application considerations, for the design choice of porous materials, it is more difficult to select and use more holes and design holes. As a further test and correction of the surface porous design, the porous design hole is used for the application. It has the advantages of applicability and near formability.

In view of the problems of the prior art, the present inventors have proposed a method for fabricating a surface porous glass ceramic based on years of research and development and many practical experiences, as an implementation and basis for improving the above disadvantages.

In view of the above, the object of the present invention is to provide a method for fabricating a surface-porous glass ceramic to solve the inconvenience of the glass ceramic process.

According to the object of the present invention, a method for fabricating a surface porous glass ceramic is proposed. The main step is to first clean a surface of a glass, then apply a powder coating on the surface of the glass, and place the glass in a microwave field to heat the coating powder. A plurality of bubbles are formed on the surface of the glass ceramic, and the glass is subjected to crystallization heat treatment and cooling of the glass, and the glass is taken out from the microwave field to form a plurality of concave holes on the surface of the glass.

The development of microwave surface porous materials will lead to new thinking in porous material design. The purpose is to meet the insufficiency of the development of porous materials in the past, to improve the surface porous structure, to avoid stress concentration during the hole manufacturing process, etc. The shape of the surface pores is circular, and the microwave heating is fast, and the heating is uniform, so the microwave porous has more advantages, and the thermal stress concentration can be avoided more.

According to the above, the method for manufacturing the surface porous glass ceramic according to the present invention has the following advantages:

(1) This manufacturing method can be heated by a microwave field, whereby the convenience of coating powder oxidation can be improved.

(2) This manufacturing method can be heated by a microwave field, thereby improving the convenience of making a recessed hole in the surface of the glass ceramic.

For a better understanding and understanding of the technical features and the efficacies of the present invention, the preferred embodiments and the detailed description are as follows.

Hereinafter, the method for fabricating the superficially porous glass ceramic according to the preferred embodiment of the present invention will be described with reference to the accompanying drawings. For the sake of understanding, the same elements in the following embodiments are denoted by the same reference numerals.

Please refer to FIG. 1 , which is a flow chart of the steps of the method for fabricating the surface porous glass ceramic of the present invention. In the figure, the method for manufacturing the surface porous glass ceramic comprises the following steps:

S11: cleaning the surface of a glass; S12: coating a surface of the glass on the surface of the glass; wherein the powder coating is a carbon powder.

S13: placing the glass in a microwave field to heat the coating powder to oxidize on the surface of the glass to form a plurality of bubbles; wherein the carbon powder generates carbon dioxide (CO ₂ ) after being heated in the microwave field.

S14: subjecting the glass to crystallization heat treatment and cooling the glass; S15: The glass is taken out from the microwave field to form a plurality of concave holes on the surface of the glass.

Please also refer to FIGS. 2A and 2B, which are schematic views of a preferred embodiment of the method for fabricating a superficially porous glass ceramic of the present invention. In the figure, after a layer of carbon powder 22 is applied on the surface of the glass ceramic 21, the glass ceramic 21 coated with the carbon powder 22 (as shown in FIG. 2A) is heated in a microwave field, and the carbon powder 22 is thermally oxidized to carbon dioxide ( CO ₂ ), at this time, a plurality of concave holes 23 are formed on the surface of the glass ceramic 21 due to the thermal oxidation of the carbon powder 22 on the surface of the glass ceramic 21 (as shown in Fig. 2B).

In addition, the glass of the component system of MgO-CaO-Al ₂ O ₃ -SiO ₂ -P ₂ O _{5 can} be used as the material, and the carbon powder is used as the microwave absorbing medium, and the surface is formed into pores and then subjected to crystallization heat treatment. Porous biomedical glass ceramics can be used as tissue engineering materials. The main chemical composition of the glass in this experiment is: MgO 3.0%, CaO 35.0%, Al ₂ O ₃ 8.6%, SiO ₂ 41.4%, P ₂ O ₅ 12.0%. The above materials are mixed separately and placed in a plastic tank and added with 20mm oxidation. The aluminum balls were ball-milled for 24 hours in a table ball mill to uniformly disperse the powder.

Then, the powder is placed in a white gold crucible and melted at a high temperature furnace at 1400 ° C for 1.5 hours to form a melt. The melt is poured into a mold to form, after cooling, the surface of the glass is cleaned, carbon powder is deposited on the surface of the glass, and the glass is placed. Heating in a microwave field causes the carbon powder to be immersed in the interior of the glass, and oxidizes to generate a gas such as carbon dioxide as the temperature rises, and expands the softened glass to form a plurality of bubbles on the surface of the glass. The calcium phosphate glass is heat treated at 1060 ° C for 1.5 hours to produce crystals. The main crystal phase is determined by XRD as follows: apatite and anorthite crystal phases, which are taken out from the microwave field after cooling, and the surface of the glass ceramics is removed. A plurality of recessed holes are formed.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

S11~S15‧‧‧Step process

21‧‧‧Glass Ceramics

22‧‧‧ toner

23‧‧‧ recessed hole

1 is a schematic view showing a method of fabricating a superficially porous glass ceramic of the present invention; and FIG. 2A is a first state view showing a preferred embodiment of a method for producing a superficially porous glass ceramic of the present invention; and FIG. 2B is a schematic view of the first embodiment; A preferred embodiment of the method of making a surface porous glass ceramic of the invention.

S11~S15‧‧‧Step process

Claims (2)

A method for manufacturing a surface porous glass ceramic, the main steps of which are as follows: (a) cleaning a surface of a glass; (b) laying a carbon powder on the surface of the glass; and (c) placing the glass in a microwave field for heating The carbon powder is immersed in the interior of the glass, and the carbon powder is oxidized to form a plurality of bubbles on the surface of the glass; (d) the glass is subjected to crystallization heat treatment and the glass is cooled, so that the glass is produced by crystallization heat treatment. Crystallizing to form a glass ceramic; and (e) removing the glass ceramic from the microwave field to obtain the glass ceramic having a plurality of recessed holes on the surface. The method for producing a superficially porous glass ceramic according to claim 1, wherein the carbon powder generates a part of carbon dioxide (CO ₂ ) after being heated in the microwave field.