Sealing ring and preparation method thereof

Abstract

The present invention provides a sealing ring and a preparation method thereof. The sealing ring, based on percent by weight, includes 80%-85% of aluminum, 10%-15% of titanium, 0.1%-1% of scrap iron, and 4%-4.9% of potassium fluoroaluminate. Moreover, the present invention provides a method for preparing sealing ring, which includes the following steps: Step A: melting the aluminum in a medium-frequency induction furnace, adding the potassium fluoroaluminate to the medium-frequency induction furnace after melting the aluminum, melting and stirring the mixture evenly; Step B: adding titanium scrap or sponge titanium, and scrap iron to the mixture successively, melting and mixing the mixture totally at 800° C. to 1200° C., standing the mixture after stirring evenly; Step C: removing scum on the surface; Step D: casting into a mold to obtain a final sealing ring.

Claims

1. A method for preparing a sealing ring, the sealing ring comprising the following components based on percent by weight: 80%-85% of aluminum; 10%-15% of titanium; 0.1%-1% of scrap iron; and 4%-4.9% of potassium fluoroaluminate: characterized in that the method comprises the following steps of: step A: melting the aluminum in a medium-frequency induction furnace, adding the potassium fluoroaluminate to the medium-frequency induction furnace to form a mixture, and melting and stirring the mixture evenly; step B: adding titanium scrap or sponge titanium, and scrap iron to the mixture successively, melting and mixing a resulting mixture totally at 800° C. to 1200° C., standing the resulting mixture after stirring evenly; step C: removing scum on a surface of the resulting mixture; and step D: casting into a mould to obtain a final sealing ring.

2. The method according to claim 1, wherein the melting in step A is performed for 4 to 6 hours.

3. The method according to claim 2, wherein the mould in step D is made from high alumina cement or copper material.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) The preferred embodiments of the present invention are described in detail below:

Embodiment 1

(2) 80 parts of aluminum is molten in a medium-frequency induction furnace, 4 parts of potassium fluoroaluminate is added to the medium-frequency induction furnace after melting the aluminum, mixed and stirred evenly; 15 parts of titanium and 1 part of scrap iron are added to the mixture successively, mixed and stirred evenly; the mixture is totally molten at 800° C. to 1200° C., made rest for 4 hours, then scum on the surface is removed; the obtained mixture is cast into a mould to obtain a final sealing ring.

Embodiment 2

(3) 82 parts of aluminum is molten in a medium-frequency induction furnace, 4.5 parts of potassium fluoroaluminate is added to the medium-frequency induction furnace after melting the aluminum, mixed and stirred evenly; 13 parts of titanium and 0.5 parts of scrap iron are added to the mixture successively, mixed and stirred evenly; the mixture is totally molten at 800° C. to 1200° C., made rest for 5 hours, then scum on the surface is removed; the obtained mixture is cast into a mould to obtain a final sealing ring.

Embodiment 3

(4) 85 parts of aluminum is molten in a medium-frequency induction furnace, 4.9 parts of potassium fluoroaluminate is added to the medium-frequency induction furnace after melting the aluminum, mixed and stirred evenly; 10 parts of titanium and 0.1 parts of scrap iron are added to the mixture successively, mixed and stirred evenly; the mixture is totally molten at 800° C. to 1200° C., made rest for 6 hours, then scum on the surface is removed; the obtained mixture is cast into a mould to obtain a final sealing ring.

(5) Comparison of the sealing ring performance of the present invention with the sealing ring performance of the prior art:

(6) TABLE-US-00001 Embodiment 1 Embodiment 2 Embodiment 3 Raw material (part) Aluminum 80 82 85 Titanium 15 13 10 Iron 1 0.5 0.1 KAlF.sub.4 4 4.5 4.9 Performance Softening point 1100° C.  900° C.  850° C. Melting point 1300° C. 1100° C. 1000° C.

(7) It can be seen from the embodiments that sealing rings of different melting points and softening temperature can be manufactured according to different content of each raw material.

(8) The sealing ring made in Embodiment 3 is applied to reaction equipment for producing sponge titanium. The equipment includes a reactor and a reactor cover with a stirring device, the sealing ring is arranged between the reactor cover and the reactor, one side of the reactor cover is provided with a lifting device for controlling the lifting of the reactor cover, a resistance furnace is arranged above the reactor cover, a valve is arranged below the resistance furnace, and a vacuum-pumping pipe and an inflation pipe are arranged above the reactor cover.

Embodiment 4

(9) Chemical equations involved:
3K.sub.2TiF.sub.6+4Al=3Ti+6KF+4AlF.sub.3
K.sub.2TiF.sub.6+2Mg=Ti+2MgF.sub.2+2KF

(10) The method includes the following steps:

(11) Step A: placing 36 g of aluminum and 36 g of magnesium into the resistance furnace, vacuum pumping, introducing argon, heating to generate a mixed liquid;

(12) Step B: opening the reactor cover, adding a calculated amount of potassium fluoroaluminate to the reactor, leakage detecting after closing the reactor cover, slowly raising the temperature to 150° C., vacuum pumping, and then heating to 250° C.;

(13) Step C: introducing argon into the reactor, continuously raising the temperature to 750° C.;

(14) Step D: opening a valve to adjust the speed, adding mixed liquid drops, and controlling the reaction temperature to 750° C. to 850° C.;

(15) Step E: opening the reactor cover, removing the stirring device, eliminating the upper layers of KAlF.sub.4, KF and MgF.sub.2 to obtain 45.12 g of sponge titanium in which the content of titanium is 96.5% and the reduction rate is 90.7%.

(16) The sealing ring of the present invention is used for the reaction to further improve the truth degree during sponge titanium production and to improve the yield.

(17) The sealing ring of the present invention is applied to distillation equipment for producing sponge titanium. The equipment includes a heating furnace and a reactor for containing condensates, a heating furnace cover is arranged above the heating furnace, a reactor cover is arranged above the reactor, the heating furnace cover and the reactor cover are connected with each other by a pipe, a resistance wire is arranged on the pipe, a lifting device is arranged above each of the heating furnace cover and the reactor cover, a vacuum pumping pipe is arranged above the heating furnace cover, a first metal sealing ring and a second metal sealing ring are respectively arranged between both ends of the pipe and the heating furnace cover and the reactor cover.

(18) The first metal sealing ring adopts the metal sealing ring in Embodiment 1, and the first metal sealing ring adopts the metal sealing ring in Embodiment 2.

Embodiment 5

(19) 36 g of aluminum, 18 g of magnesium and 240 g of potassium fluoroaluminate are reacted at 800° C. under the condition of vacuum introduction of argon;

(20) in a vacuum state, the reactant is distilled in the heating furnace at 1100° C., the resulting KF, AlF.sub.3, MgF.sub.2 and Mg are introduced into the reactor through the pipe;

(21) 45.45 g of sponge titanium is obtained by keeping the vacuum state after cooling, the content of titanium in the product is 98% and the reduction rate is 92.8%.

(22) The above metal sealing ring is adopted to further ensure the tightness during distillation, improve the distillation efficiency, and greatly increase the purity and reduction rate of produced sponge titanium.

(23) The above is the further detailed description made to the invention in conjunction with specific preferred embodiments, but it should not be considered that the specific embodiments of the invention are only limited to these descriptions. For one of ordinary skill in the art to which the invention belongs, many simple deductions and replacements can be made without departing from the inventive concept. Such deductions and replacements should fall within the scope of protection of the invention.