JPS60191098A - Manufacture of corundum - Google Patents

Abstract

PURPOSE:To synthesize the titled blue corundum doped with cobalt by sintering a raw material rod consisting of aluminum oxide and cobalt oxide, using said sintered rod as the raw material, and using a corundum crystal as the seed crystal. CONSTITUTION:Aluminum oxide as the essential component and cobalt oxide as the colorant are mixed and pulverized, and the amt. of the cobalt oxide to about 3.0-5.0wt%. The mixed powder is packed into a rubber tube, and the air in the tube is let out. The mixed powder is molded into a columnar rod with the rubber press method, and sintered at about 1,300-1,600 deg.C to obtain the raw material rod. The sapphire is synthesized with the beam-condensing floating zone method by using said raw material rod as the raw material and a ruby or a sapphire single crystal as the seed crystal. The blue corundum crystal in a shade different from the existing blue sapphire can be manufactured in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing corundum using a condensing FZ method.

[Prior art]

Traditionally blue corundum is called blue sapphire.
Iron oxide and titanium oxide were used as colorants. On the other hand, blue corundum using cobalt as a coloring agent has not been synthesized to date. The goal is to synthesize corundum.

[Summary of the invention]

Aluminum oxide powder, the main component, and cobalt oxide powder, the coloring agent, are weighed into a mortar and mixed thoroughly. The amount of cobalt oxide at this time is 50 to 5.0 W%. Next, the raw materials are packed into a rubber tube, the air inside the tube is removed, and the tube is molded into a cylindrical rod using a rubber press method. This rod is sintered at 1600°C to 1j00°C to obtain a raw material rod. This is used as a raw material, and synthesis is carried out using a device as shown in Figure 1, using single corundum madder such as ruby or sapphire as a seed crystal. be. The 11 synthesis conditions follow the synthesis conditions of Ilby and Sapphire, which have been conventionally carried out using the condensing FZ method.

〔Example〕

Hereinafter, a practical example will be described in order to clarify the effects of the present invention.

<Example 1> O raw material composition Al, 0. 29.15' Oo OO, 9f Preparation of O raw material rod The above raw material powder is mixed in an alumina milk drum. Apply this to the rubber tube of the φ1a fin, and after removing the air, use the rubber press method to attach the lily φ8mm x 80in.
Form into a bar (t). The kosai was sintered in an electric furnace at 1600°C for 4 hours to obtain a Harazu bar.

O Crystal Synthesis Using the raw material rod prepared above as a raw material and using ruby as a seed crystal, crystal synthesis was carried out using the apparatus shown in FIG. 1 under the growth conditions shown below.

Growth direction (001) Shaft rotation speed: 30 rpm (up and down reverse rotation) 1 Formed atmosphere air Growth speed 2. Q exposure/H OResults and findings Blue crystals with no uneven color were synthesized.

<Example 2> offi, material composition At20. 3a5f! G　o　o　o　1. 5≦− 5o raw material rod production According to <Example 1>.

Example 1 was followed except that the growth rate was set to t Omm/H.

0 results and findings Blue crystals with no uneven color were synthesized.

<Example 3> 0j et al. Al,,Oa　29.15' Co　OO,9V O raw material)・;Σ production Example 1 was followed.

Example 1) + fY except that the growth direction of 0 crystallites was set to (100).・Q results and findings Blue crystals with no color unevenness were synthesized.

[Obvious effect]

As described above, according to the present invention, by using cobalt 15meride as a coloring agent, it has become possible to synthesize a blue corundum crystal that is different from the conventional blue sapphire.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the experimental apparatus used in the present invention. 1...Spheroidal mirror 2...Halogen lamp 5...Stone capsule tube 4...Internal air gas inlet 5...Atmosphere Gas outlet 6... Raw material body 7... Seed crystal 8... Melting zone 9... Main 4'j+ J Nishaft 10...° Below the shaft below the main axis Applicant: Suwa 1JL Co., Ltd., agent of Kosha, patent attorney, Tsutomu Mogami Figure 1

Claims (1)

[Claims] Raw material powder of corundum, which is mainly composed of aluminum ri12 and cobalt oxide as a coloring agent, is packed into a rubber tube, formed into a rod shape by a rubber press method, and sintered to form a raw material rod. There is also a method for producing corundum characterized by synthesis using a condensing floating zone method using corundum crystals such as sapphire.