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Aluminum fluoride composite ceramic and preparation method thereof

A technology of composite ceramics and aluminum fluoride, which is applied in the field of ceramics, can solve the problems of flammability and explosion of raw materials and low fluoride ion content, and achieve the effect of increasing the content of fluoride ions and avoiding inflammability and explosion

Pending Publication Date: 2020-04-28
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a kind of aluminum fluoride composite ceramics and its preparation method, the technical problem to be solved is to solve the original Al / AlF 3 The problem of flammable and explosive raw materials and low fluoride ion content

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  • Aluminum fluoride composite ceramic and preparation method thereof

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preparation example Construction

[0028] A kind of preparation method of aluminum fluoride composite ceramics that one embodiment of the present invention proposes, it comprises:

[0029] (1) AlF 3 、MF 2 , sintering aid TF and binder are mixed, and after ball milling, drying and sieving, aluminum fluoride mixture is obtained; among them, MF 2 for CaF 2 and MgF 2 At least one of; TF is at least one of LiF, NaF and KF;

[0030] Specifically, the AlF 3 and MF 2 Mix, then add TF sintering aid and binder.

[0031] In weight percent, AlF 3 : MF 2 =1:1~9:1, preferably 1:1, 7:3, 8:2 and 9:1.

[0032] Pure AlF 3 Due to the low decomposition temperature, it is difficult to densify, and MF needs to be added 2 To improve its decomposition problem and achieve densification; MF 2 The less, the lower the density, the higher the fluoride ion content; MF 2 The more, the higher the density and the lower the fluoride ion content.

[0033] By introducing MF 2 , TF and other additives to replace Al powder, the obvio...

Embodiment 1～9

[0049] (1) With the raw material of aluminum fluoride composite ceramics listed in Table 1, AlF 3 、MF 2 , sintering aid TF and binder (optionally one of dextrin, starch, polyvinyl alcohol and gum arabic) are mixed, ball milled at a speed of 100-200r / min for 3-8h, naturally dried, using 30 mesh ~100 mesh for sieving to obtain aluminum fluoride mixture;

[0050] (2) Put the aluminum fluoride composite material into a rubber mold or a stainless steel mold, and perform dry pressing molding under a pressure of 30-100 MPa, or perform isostatic pressing molding under a pressure of 100-300 MPa to obtain an aluminum fluoride composite ceramic green body ;

[0051] (3) Sintering the aluminum fluoride composite ceramic green body, the sintering conditions: first raise the temperature to 600°C at a rate of 0.5°C / min-2°C / min, and keep the temperature at 600°C for 1-2h; The heating rate of ℃ / min~5℃ / min was raised from 600℃ to 800℃~950℃, and kept at 800℃~950℃ for 1~8h; the aluminum fluori...

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Abstract

The invention relates to a preparation method of aluminum fluoride composite ceramic, which comprises the following steps: mixing AlF3, MF2, a sintering aid TF and a binder, and carrying out ball milling, drying and screening to obtain an aluminum fluoride mixture, with the MF2 being at least one of CaF2 and MgF2 and the TF being at least one of LiF, NaF and KF; carrying out dry pressing molding or isostatic pressing molding on the aluminum fluoride mixture to obtain an aluminum fluoride composite ceramic biscuit; and sintering the aluminum fluoride composite ceramic biscuit to obtain the aluminum fluoride composite ceramic. According to the preparation method, additives such as MF2 and TF are introduced to replace Al powder, so that the content of fluorine ions in the composite material can be effectively increased on the basis that a disadvantage that Al powder is inflammable and explosive is avoided. Meanwhile, isostatic pressing, air atmosphere pressureless sintering and other methods are adopted, preparation of the large-size aluminum fluoride composite ceramic can be achieved, and the industrial batch production requirement of a BNCT moderator physical device is met.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to an aluminum fluoride composite ceramic and a preparation method thereof. Background technique [0002] Neutron therapy is Boron Neutron Capture Therapy (BNCT for short). Boron neutron capture therapy destroys cancer cells through nuclear reactions in tumor cells. The BNCT physical device can be used to treat diseases such as head and neck cancer, low-density tissue (lung, pleural) cancer, skin melanoma, and liver metastases. The moderator is the core component of the BNCT physical device. Fluoride ceramics can achieve neutron moderation because of their fluorine ions, and are the preferred material for the moderator of BNCT physical devices. At present, the moderator materials are mainly calcium fluoride, Al / AlF 3 Composite materials. [0003] Existing Al / AlF for neutron moderation 3 Composite materials mainly use Al powder as sintering auxiliary material, and hot pressing s...

Claims

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Application Information

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IPC IPC(8): C04B35/553C04B35/622C04B35/64
CPCC04B35/553C04B35/622C04B35/64C04B2235/445C04B2235/6583
Inventor 任佳乐旷峰华张洪波任瑞康司东方
Owner CHINA BUILDING MATERIALS ACAD
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