JPH0383826A - Production of fine glass sphere - Google Patents

Abstract

PURPOSE:To stably a produce fine glass sphere having high sphericity without blowhole by making a jig having groove of arc cross-section containing surface layer of Pt-Au alloy to have temperature gradient in inclined state and pouring glass powder into the groove. CONSTITUTION:A jig having surface layer composed of Pt-Au alloy or Pt-Rh-Au alloy containing 3-10wt.% Au having groove of arc cross section is prepared. Said jig is inclined and temperature gradient is imparted on the incline from upper to lower. Next, glass powder is poured to the upper end part of the jig and melted, then gradually coagulated with rotating in the groove to solidify in spherical shape.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is particularly applicable to optoelectronic I.
This invention relates to a method for manufacturing micro glass spheres for ronics.

(Prior Art and Problems) Conventionally, as one method for making the above-mentioned micro glass spheres, powdered glass is placed in a jig made of Pt or the like having a hemispherical recess, heated to melt, and then It was spheroidized by the surface tension during cooling and solidification.

However, this method has problems in that it is difficult to peel off from the jig, and gas and air entrainment and residual cavities remain, making it impossible to obtain a sufficient true sphere.

(Objective of the Invention) The present invention aims to provide a method for accurately and stably producing micro glass spheres with good roundness and no cavities.

(Structure of the Invention) The technical means of the present invention for solving the above problems is a method for manufacturing micro glass spheres in which at least the surface layer is A.
PtAu alloy containing u3-10% by weight or PtRhAu
The method is characterized in that a jig made of an alloy having an arc-shaped groove in cross section is tilted, a temperature gradient is created from the top to the bottom of the slope of the jig, and powdered glass is introduced at the upper end of the jig. .

(Function) According to the present invention configured as described above, after the powdered glass is melted, it gradually solidifies and becomes spheroidized while rotating in the groove having an arcuate cross section due to its own weight, inclination, and temperature difference. It is.

In this case, since the groove shape is arcuate in cross section and at least the surface layer is made of PtAu alloy or PtRhAu alloy, appropriate wettability is obtained, jig performance is good, surface tension acts effectively, and Combined with rotation, a perfect sphere can be obtained. In addition, the Au content of the PtAu alloy or PtRhAu alloy is preferably 3 to 10% by weight; if it exceeds 10% by weight, the wettability is too good and it becomes flat, making it impossible to obtain a true sphere, and the alloy material becomes brittle and difficult to process. If it is less than 3% by weight, the wettability will not be improved in the direction of decrease, resulting in poor jig performance and an imbalance between rotation and solidification, making it impossible to obtain true spheres. Further, the length of the groove having an arcuate cross section of the jig is sufficient as long as it is long enough to solidify the molten glass, and the depth of the groove is preferably equal to or greater than the radius of the glass bulb. Furthermore, the temperature gradient should be in the range from the glass melting state to solidification < 1300
The temperature is preferably from 1100°C to 1100°C, and the final temperature is room temperature.

(Example) Examples and conventional examples will be described below.

First, as an example, the jig material is PtAu 5% by weight, the depth of the semicircular groove in cross section is 0.5 mm, the width of the semicircular groove is 0.5 mm, the inclination angle is 30 degrees, the length is 1.3 m, the upper temperature is 1300°C, the lower temperature is In a device at 800'C, the glass material E glass was introduced in powder form from the upper end of the jig, and the outer diameter was 0.5 m.
100 micro glass spheres of m diameter were continuously obtained.

On the other hand, as a conventional example, the material is Pt, the diameter is 0.5 mm, and the depth is 0.
．． After melting the glass material E glass in a powder state in a 1300'C electric furnace using a jig with a 5mm hemispherical recess,
The mixture was cooled and solidified to obtain 100 micro glass spheres.

However, when we conducted a quality inspection, we obtained the following results.

In addition, the breakdown of defective products in the conventional example is those that are not perfectly spherical,
It may be partially concave or irregularly shaped due to a nest, or it may not have separated from the jig.

In the above embodiment, a jig made of PtAu alloy was described, but the present invention is not limited to this.
An Au alloy (Rh composition preferably 5 to 15% by weight) may also be used.

(Effects of the Invention) As described above, the method for manufacturing micro glass spheres of the present invention has the excellent effect of being able to produce micro glass spheres with good accuracy (stablely) without cavities and with good sphericity. It has the following.

Claims (1)

[Claims] 1. In manufacturing micro glass spheres, at least the surface layer contains a PtAu alloy or PtR containing 3 to 10% by weight of Au.
A micro glass sphere characterized in that a jig made of an hAu alloy having an arcuate groove in cross section is tilted, a temperature gradient is created from the top to the bottom of the slope of the jig, and powdered glass is introduced at the upper end of the jig. Production method.