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Pretreatment method of multi-component powder raw material

A multi-component, pretreatment technology, applied in the field of material preparation, can solve the problems of unstable component addition, volatile, offset, etc., to avoid poor product performance, reduce sintering temperature, and reduce component offset Effect

Active Publication Date: 2021-05-14
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a pretreatment method for multi-component powder raw materials containing sensitive components, the purpose of which is to precisely control the temperature of multi-component powder raw materials, so that The sensitive component in the powder raw material reacts with other powder raw materials to form a more stable compound powder, avoiding the component deviation caused by the volatilization or instability of the sensitive component in the subsequent sintering step, thereby solving the existing volatile , The technical problems of poor performance of the final product or poor consistency between product batches caused by the deviation of the addition of unstable ingredients

Method used

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Examples

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Embodiment 1

[0044] Embodiment 1 a kind of 0.2Na 2 O-0.2B 2 o 3 -0.6SiO2 2 Multi-component glass powder, the raw material is Na 2 CO 3 , B 2 o 3 , SiO 2 .

[0045] where Na 2 CO 3 The melting point is lower than the decomposition temperature. When the glass is melted, it will decompose and produce bubbles. It is a sensitive component. B 2 o 3 It is volatile and is a sensitive component, so it adopts multi-stage heat preservation.

[0046] The preprocessing steps are as follows:

[0047] Accurately weigh in proportion to Na 2 CO 3 , B 2 o 3 , SiO 2 Three kinds of powder, ball milled until uniform.

[0048] The multi-component powder raw material is heated to raise the temperature at a heating rate of 10°C / min, and kept at 800-850°C for a holding time of 8 hours.

[0049] The upper limit of the temperature range is determined due to B 2 o 3 The melting point is low at 450°C, Na 2 CO 3 will eventually decompose, and due to Na 2 CO 3 The melting point is about 850°C, c...

Embodiment 2

[0052] A Bi 0.5 Na 0.5 TiO 3 Ceramic powder, the raw material is Na 2 CO 3 、 Bi 2 o 3 、TiO 2 .

[0053] where Na 2 CO 3 、 Bi 2 o 3 for sensitive components.

[0054] The preprocessing steps are as follows:

[0055] Accurately weigh in proportion to Na 2 CO 3 、 Bi 2 o 3 、TiO 2 Three kinds of powder, ball milled until uniform.

[0056] The multi-component powder raw material was heated to raise the temperature at a rate of 5°C / min and kept at 750°C, and the holding time was 12h.

[0057] Determination of the upper limit of the temperature range, Bi 2 o 3 Melting point 825°C, Na 2 CO 3 The melting point is about 850°C, query Bi 2 o 3 -TiO 2 According to the phase diagram, under the original composition, the melting point of the system is around 1200°C, the lowest melting point of any proportion is around 820°C, and the melting point of the test components is around 800°C, so the pre-calcination temperature is set in the range of 750-800°C. Since there ar...

Embodiment 3

[0060] A 0.3SiO2 2 -0.2B 2 o 3 -0.2La 2 o 3 -0.3TeO 2 Multi-component glass powder, raw material is SiO 2 , B 2 o 3 , La 2 o 3 , TeO 2 .

[0061] where B 2 o 3 , TeO 2 It is a volatile sensitive component.

[0062] The preprocessing steps are as follows:

[0063] Accurately weighed in proportion to SiO 2 , B 2 o 3 , La 2 o 3 , TeO 2 Four kinds of powders, ball milled until uniform.

[0064] due to B 2 o 3 Melting point is 450°C, TeO 2 The melting point is 733°C, and two stages of holding temperature need to be set. The multi-component powder raw material was heated up and kept at the first preset temperature of 420° C., the heating rate was 5° C. / min, and the holding time was 12 hours. The determination of the upper limit of the first preset temperature range, combined with B 2 o 3 Phase diagram with other components, composition points and melting points are higher than B 2 o 3 Melting point, that is, the upper limit temperature is B 2 o 3 Melt...

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Abstract

The invention discloses a pretreatment method of a multi-component powder raw material. The method comprises the following steps: heating the multi-component powder raw material containing sensitive components until the sensitive components in the powder raw material react with other powder raw materials to form more stable compound powder so as to obtain the multi-component powder raw material containing the more stable compound powder, wherein the sensitive components are volatile or unstable components. According to the pretreatment method of the multi-component powder raw material containing the sensitive components, the volatile or unstable sensitive components are converted into the more stable powder components by means of pre-heating, so that component deviation caused by content reduction of the volatile or unstable components in the sintering process is effectively reduced, the yield of the multi-component powder raw material containing the sensitive components is improved, and the problem that the final product performance is poor or the consistency between batches of products is poor due to component deviation is avoided.

Description

technical field [0001] The invention belongs to the field of material preparation, and more specifically relates to a pretreatment method for multi-component powder raw materials containing sensitive components. Background technique [0002] Powder raw material treatment is an important stage in the material preparation process. The preparation of glass, ceramics, crystals and other materials will involve the pretreatment of powder raw materials. Generally, the pretreatment of powder raw materials only includes the mixing and drying process, and the preparation of glass is directly. The powder raw material is put into a high-temperature furnace, and the glass liquid is made uniform by stirring equipment, and the ceramics are formed and then placed in a high-temperature furnace for sintering. [0003] If the melting points of the components of the raw materials are quite different, or contain B 2 o 3 ,P 2 o 5 , TeO 2 、 Bi 2 o 3 , CaCO 3 Such volatile, unstable, and ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/089C04B35/475C04B35/622C03C3/068
CPCC03C3/089C04B35/475C04B35/622C03C3/068C04B2235/3201C04B2235/6562C04B2235/6567C04B2235/9661
Inventor 毛召召李志涛周游陈刚杜立华熊良明
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD