TWI804800B - Neutron moderator material and method for producing the same - Google Patents
Neutron moderator material and method for producing the same Download PDFInfo
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Abstract
Description
本發明係有關一種複合材料，特別是提供一種中子減速材料及其製作方法。 The invention relates to a composite material, in particular to a neutron moderator material and a manufacturing method thereof.
標靶放射線治療係常用之癌症治療手段，其中標靶放射線治療主要係利用硼中子捕獲治療(Boron Neutron Capture Therapy；BNCT)的機制來進行。BNCT之原理主要係先將親癌細胞的含硼藥物注入癌症患者之身體內，以藉由血液循環與癌細胞結合。當癌細胞位置聚集濃度足夠高的含硼藥物時，從原子爐或加速器型的中子束源產生器射出能量適當的熱中子束，並照射在腫瘤部位。由於熱中子會與含硼藥物產生核反應，而***為具有高生物破壞能力之輻射性粒子，因此可破壞癌細胞的DNA結構。由於此些輻射性粒子的射程不超過單一癌細胞的直徑範圍，故在破壞癌細胞之DNA結構時，輻射性粒子對正常細胞的傷害可被降到最低。據此，癌細胞附近的正常細胞組織可被保護。 Targeted radiation therapy is a commonly used method for cancer treatment, and targeted radiation therapy is mainly carried out by using the mechanism of Boron Neutron Capture Therapy (BNCT). The principle of BNCT is to first inject boron-containing drugs that are pro-cancer cells into the body of cancer patients, so as to combine with cancer cells through blood circulation. When the concentration of boron-containing drugs is high enough to gather at the cancer cell site, a thermal neutron beam with appropriate energy is emitted from the atomic furnace or accelerator-type neutron beam source generator and irradiated on the tumor site. Since thermal neutrons will react with boron-containing drugs, they will be split into radioactive particles with high biological destructive ability, thus destroying the DNA structure of cancer cells. Since the range of these radiation particles does not exceed the diameter range of a single cancer cell, the damage of radiation particles to normal cells can be minimized when destroying the DNA structure of cancer cells. According to this, normal cell tissues near the cancer cells can be protected.
適合BNCT的中子能量為1eV至10keV，故中子束源產生器所產生的高能中子射線可透過減速材料(moderator materials)進行減速，並降低其能量。一般係採用金屬氟化物-鋁-氟化鋰複合材料作為熱中子減速材料，其中金屬鋁的含量為20體積百分比至50體積百分比，氟化鋰含量小於2體積百分比，而其他則為金屬氟化物。一個先前技術提出一種BNCT熱中子減速材料，其組成為氟化鋁-鋁-氟化鋰，且氟化鋰的含量為1體積百分比。此先前技術係採用熱均壓製程(Hot Isostatic Pressing；HIP)來製作此複合材料。然而，此先前技術並未明確揭示如何將含量極少的氟化鋰陶瓷粉體均勻地分散在複合材料中，且其並未明確揭示如何利用熱均壓製程來製作中子減速材料。另外，熱均壓製程一般須先將粉體填充至金屬容器中，並進行真空封罐(canning)。然後，將封罐的金屬容器放入熱均壓設備中，利用氣體作為壓力介質，以對金屬容器進行等向加壓，藉此完成複合材料的成型及緻密化。由於熱均壓製程受到金屬容器拘束力的影響，其得料率一般僅65%至80%，故具有較高之製造成本。 The neutron energy suitable for BNCT is 1eV to 10keV, so the high-energy neutron rays generated by the neutron beam source generator can pass through moderator materials to decelerate and reduce its energy. Generally, metal fluoride-aluminum-lithium fluoride composite materials are used as thermal neutron moderator materials, in which the content of metal aluminum is 20 volume percent to 50 volume percent, the content of lithium fluoride is less than 2 volume percent, and the others are metal fluorides . A prior art proposes a BNCT thermal neutron moderator material, the composition of which is aluminum fluoride-aluminum-lithium fluoride, and the content of lithium fluoride is 1 volume percent. The prior art uses a hot isostatic pressing process (Hot Isostatic Pressing; HIP) to make the composite material. However, this prior art does not clearly disclose how to uniformly disperse the lithium fluoride ceramic powder with a very small content in the composite material, and it does not clearly disclose how to use a heat isostatic pressing process to manufacture neutron moderator materials. In addition, the hot equalization process generally needs to fill the powder into a metal container first, and then perform vacuum canning. Then, the sealed metal container is put into the heat equalization equipment, and the gas is used as the pressure medium to pressurize the metal container isotropically, thereby completing the molding and densification of the composite material. Since the heat isostatic pressing process is affected by the binding force of the metal container, its material yield is generally only 65% to 80%, so it has a relatively high manufacturing cost.
有鑑於此，亟須提供一種中子減速材料及其製作方法，以改進習知中子減速材料之製作方法具有低得料率的缺陷。 In view of this, there is an urgent need to provide a neutron moderating material and a manufacturing method thereof, so as to improve the defect of low yield of the conventional neutron moderating material manufacturing method.
因此，本發明之一態樣是在提供一種中子減速材料 的製作方法，其藉由多階段之乾式混粉製程來混合粉體材料，並以熱壓製程緻密化複合粉體，而可製得組織均勻且緻密的中子減速材料。 Therefore, one aspect of the present invention is to provide a kind of neutron moderation material The production method of the present invention uses a multi-stage dry powder mixing process to mix powder materials, and densifies the composite powder with a hot pressing process, so that a uniform and dense neutron moderator material can be obtained.
本發明之另一態樣是在提供一種中子減速材料，其係利用前述之製作方法所製得。 Another aspect of the present invention is to provide a neutron moderator material, which is produced by the aforementioned production method.
根據本發明之一態樣，提出一種中子減速材料的製作方法。此製作方法係先提供金屬氟化物粉體、氟化鋰粉體與金屬鋁粉體。其中，金屬氟化物粉體不包含氟化鋰。基於中子減速材料為100體積百分比，金屬鋁粉體之用量為20體積百分比至50體積百分比，氟化鋰粉體之用量為0.5體積百分比至2體積百分比，且餘量為金屬氟化物粉體。然後，對氟化鋰粉體與一部分之金屬鋁粉體進行第一乾式混粉製程，以形成金屬鋁-氟化鋰複合粉體。接著，對金屬氟化物粉體、剩餘之金屬鋁粉體與前述之金屬鋁-氟化鋰複合粉體進行第二乾式混粉製程，以形成金屬氟化物-金屬鋁-氟化鋰複合粉體。之後，對金屬氟化物-金屬鋁-氟化鋰複合粉體進行熱壓製程，即可形成中子減速材料。 According to an aspect of the present invention, a method for manufacturing a neutron moderator material is proposed. In this manufacturing method, metal fluoride powder, lithium fluoride powder and metal aluminum powder are firstly provided. However, the metal fluoride powder does not contain lithium fluoride. Based on 100 volume percent of the neutron moderator material, the amount of metal aluminum powder used is 20 volume percent to 50 volume percent, the amount of lithium fluoride powder used is 0.5 volume percent to 2 volume percent, and the balance is metal fluoride powder . Then, a first dry powder mixing process is performed on the lithium fluoride powder and a part of the metal aluminum powder to form the metal aluminum-lithium fluoride composite powder. Next, the metal fluoride powder, the remaining metal aluminum powder and the aforementioned metal aluminum-lithium fluoride composite powder are subjected to a second dry powder mixing process to form a metal fluoride-metal aluminum-lithium fluoride composite powder . After that, the metal fluoride-metal aluminum-lithium fluoride composite powder is subjected to a hot pressing process to form a neutron moderator material.
依據本發明之一些實施例，前述之金屬氟化物粉體包含氟化鎂、氟化鋁及/或氟化鈣。 According to some embodiments of the present invention, the aforementioned metal fluoride powder includes magnesium fluoride, aluminum fluoride and/or calcium fluoride.
依據本發明之一些實施例，前述氟化鋰粉體之平均粒徑為1μm至3μm。 According to some embodiments of the present invention, the average particle diameter of the aforementioned lithium fluoride powder is 1 μm to 3 μm.
依據本發明之一些實施例，前述金屬鋁粉體之平均粒徑為5μm至15μm。 According to some embodiments of the present invention, the average particle diameter of the aforementioned aluminum metal powder is 5 μm to 15 μm.
依據本發明之一些實施例，前述金屬氟化物粉體、 氟化鋰粉體與金屬鋁粉體之純度均大於99%。 According to some embodiments of the present invention, the aforementioned metal fluoride powder, The purity of lithium fluoride powder and metal aluminum powder is greater than 99%.
依據本發明之一些實施例，於進行前述之第一乾式混粉製程時，氟化鋰粉體與部分之金屬鋁粉體的體積比值為0.05至0.1。 According to some embodiments of the present invention, when performing the aforementioned first dry powder mixing process, the volume ratio of the lithium fluoride powder to a part of the metal aluminum powder is 0.05 to 0.1.
依據本發明之一些實施例，前述第一乾式混粉製程之混合時間為0.5小時至1小時，而第二乾式混粉製程之混合時間為0.5小時至1小時。 According to some embodiments of the present invention, the mixing time of the first dry powder mixing process is 0.5 hour to 1 hour, and the mixing time of the second dry powder mixing process is 0.5 hour to 1 hour.
依據本發明之一些實施例，前述熱壓製程之溫度為550℃至620℃，而熱壓製程之壓力為5MPa至55MPa。 According to some embodiments of the present invention, the temperature of the aforementioned hot pressing process is 550° C. to 620° C., and the pressure of the hot pressing process is 5 MPa to 55 MPa.
依據本發明之一些實施例，前述熱壓製程之時間為1小時至6小時。 According to some embodiments of the present invention, the aforementioned hot pressing process lasts from 1 hour to 6 hours.
根據本發明之另一態樣，提出一種中子減速材料，其係藉由前述之製作方法所製得。其中，中子減速材料之相對密度不小於99.5%，且中子減速材料中最大顆粒的粒徑係不大於500μm。 According to another aspect of the present invention, a neutron moderating material is proposed, which is manufactured by the aforementioned manufacturing method. Among them, the relative density of the neutron moderating material is not less than 99.5%, and the particle size of the largest particle in the neutron moderating material is not greater than 500 μm.
應用本發明中子減速材料及其製作方法，其係多階段地混合金屬氟化物粉體、氟化鋰粉體與金屬鋁粉體，而使氟化鋰粉體均勻地嵌埋於金屬鋁粉體之表面，進而可製得具有均勻組織之複合粉體。其次，藉由熱壓製程之緻密化，所成型之中子減速材料可具有緻密之組織結構，而可滿足中子捕獲設備的應用需求。另外，本發明係藉由乾式混粉製程來混合粉體材料，故不須使用有機溶劑等混合載體，故可降低材料之製作成本，並達到環保減廢之要求。 The application of the neutron moderator material and its production method of the present invention is to mix metal fluoride powder, lithium fluoride powder and metal aluminum powder in multiple stages, so that the lithium fluoride powder is evenly embedded in the metal aluminum powder The surface of the body can be made into a composite powder with a uniform structure. Secondly, through the densification of the hot pressing process, the formed neutron moderator material can have a dense structure, which can meet the application requirements of neutron capture equipment. In addition, the present invention mixes powder materials through a dry powder mixing process, so there is no need to use mixing carriers such as organic solvents, so it can reduce the production cost of materials and meet the requirements of environmental protection and waste reduction.
100:方法 100: method
110,120,130,140,150:操作 110, 120, 130, 140, 150: operation
為了對本發明之實施例及其優點有更完整之理解，現請參照以下之說明並配合相應之圖式。必須強調的是，各種特徵並非依比例描繪且僅係為了圖解目的。相關圖式內容說明如下。 In order to have a more complete understanding of the embodiments of the present invention and their advantages, please refer to the following descriptions together with the corresponding drawings. It must be emphasized that the various features are not drawn to scale and are for illustration purposes only. The contents of the related drawings are explained as follows.
圖1係繪示依照本發明之一些實施例之中子減速材料的製作方法之流程示意圖。 FIG. 1 is a schematic flow chart illustrating a method for manufacturing a neutron moderating material according to some embodiments of the present invention.
圖2A與圖2B分別係顯示本發明之實施例1與實施例2之中子減速材料的電子顯微鏡照片。 FIG. 2A and FIG. 2B respectively show the electron micrographs of the neutron moderating material of Example 1 and Example 2 of the present invention.
以下仔細討論本發明實施例之製造和使用。然而，可以理解的是，實施例提供許多可應用的發明概念，其可實施於各式各樣的特定內容中。所討論之特定實施例僅供說明，並非用以限定本發明之範圍。 The making and using of embodiments of the invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are illustrative only and do not limit the scope of the invention.
請參照圖1，其係繪示依照本發明之一些實施例之中子減速材料的製作方法之流程示意圖。於方法100中，先提供金屬氟化物粉體、氟化鋰粉體與金屬鋁粉體，並對氟化鋰粉體與部分之金屬鋁粉體進行第一乾式混粉製程，以製得金屬鋁-氟化鋰複合粉體，如操作110與操作120所示。金屬氟化物粉體不包含氟化鋰。在一些實施例中，金屬氟化物粉體可包含氟化鎂、氟化鋁、氟化鈣、其他適當之金屬氟化物，或者前述材料之任意混合。在其他實施
例中，為了提升所製得中子減速材料之性質，金屬氟化物粉體、氟化鋰粉體與金屬鋁粉體之純度均大於99%。
Please refer to FIG. 1 , which is a schematic flowchart illustrating a method for manufacturing neutron moderating materials according to some embodiments of the present invention. In the
基於後續所製得之中子減速材料為100體積百分比，金屬鋁粉體之用量可為20體積百分比至50體積百分比，氟化鋰粉體之用量為0.5體積百分比至2體積百分比，且其餘量為金屬氟化物粉體。當金屬鋁粉體、氟化鋰粉體與金屬氟化物粉體之用量不為前述之範圍時，後續所製得之複合材料無法滿足中子減速材料之應用需求。 Based on 100 volume percent of the neutron moderator material obtained later, the amount of metal aluminum powder can be 20 volume percent to 50 volume percent, the amount of lithium fluoride powder can be 0.5 volume percent to 2 volume percent, and the remaining amount It is metal fluoride powder. When the amount of the metal aluminum powder, lithium fluoride powder and metal fluoride powder is not within the aforementioned range, the subsequent composite material cannot meet the application requirements of neutron moderator materials.
於進行第一乾式混粉製程時，氟化鋰粉體與部分之金屬鋁粉體可採用本發明所屬技術領域常用之技術手段或設備來混合，故在此不另贅述。其中，由於氟化鋰粉體之硬度係高於金屬鋁粉體的硬度，故於第一乾式混粉製程所形成之金屬鋁-氟化鋰複合粉體中，氟化鋰之陶瓷粉體係嵌埋於金屬鋁粉體之表面。在一些實施例中，為了提升第一乾式混粉製程之混合嵌埋效果，金屬鋁粉體之平均粒徑較佳係大於氟化鋰粉體的平均粒徑。在一些具體例中，氟化鋰粉體之平均粒徑可為1μm至3μm，而金屬鋁粉體之平均粒徑為5μm至15μm。當氟化鋰與/或金屬鋁粉體之平均粒徑為前述之範圍時，氟化鋰粉體可更均勻地嵌埋於金屬鋁粉體之表面，而有助於提升所製得中子減速材料的性質。 When performing the first dry powder mixing process, the lithium fluoride powder and part of the metal aluminum powder can be mixed using technical means or equipment commonly used in the technical field of the present invention, so no further details are given here. Among them, since the hardness of lithium fluoride powder is higher than that of metal aluminum powder, the ceramic powder of lithium fluoride is embedded in the metal aluminum-lithium fluoride composite powder formed in the first dry powder mixing process. Buried on the surface of metal aluminum powder. In some embodiments, in order to improve the mixing and embedding effect of the first dry powder mixing process, the average particle size of the metal aluminum powder is preferably larger than the average particle size of the lithium fluoride powder. In some specific examples, the average particle size of the lithium fluoride powder may be 1 μm to 3 μm, and the average particle size of the aluminum metal powder may be 5 μm to 15 μm. When the average particle size of lithium fluoride and/or metal aluminum powder is within the aforementioned range, lithium fluoride powder can be more evenly embedded on the surface of metal aluminum powder, which helps to increase the neutrons produced. The nature of the moderating material.
於進行第一乾式混粉製程時，氟化鋰粉體與部分之金屬鋁粉體的體積比值可為0.05至0.1。當氟化鋰粉體與金屬鋁粉體之體積比值為前述之範圍時，氟化鋰粉體可更 均勻地嵌埋於金屬鋁粉體之表面，而有助於提升所製得中子減速材料的性質。其次，為了提升氟化鋰粉體與金屬鋁粉體之混合均勻性，第一乾式混粉製程混合時間可為0.5小時至1小時。 When performing the first dry powder mixing process, the volume ratio of the lithium fluoride powder to a part of the metal aluminum powder can be 0.05 to 0.1. When the volume ratio of lithium fluoride powder to metal aluminum powder is within the aforementioned range, the lithium fluoride powder can be more Evenly embedded on the surface of the metal aluminum powder, it helps to improve the properties of the obtained neutron moderator material. Secondly, in order to improve the mixing uniformity of the lithium fluoride powder and the metal aluminum powder, the mixing time of the first dry powder mixing process can be 0.5 hour to 1 hour.
於進行操作120後，將所形成之金屬鋁-氟化鋰複合粉體，以及金屬氟化物粉體與剩餘之金屬鋁粉體添加至混粉設備中，以進行第二乾式混粉製程，而可形成金屬氟化物-金屬鋁-氟化鋰複合粉體，如操作130所示。在一些實施例中，操作120與操作130可於相同之混粉設備中進行，故於進行操作120後，金屬氟化物粉體與剩餘之金屬鋁粉體可直接添加至混粉設備中。惟本發明並不以此為限，在其他實施例中，操作120與操作130亦可於不同之混粉設備中進行。相同地，第二乾式混粉製程可採用本發明所屬技術領域常用之技術手段或設備來混合，故在此不另贅述。在一些實施例中，第二乾式混粉製程之混合時間可為0.5小時至1小時。
After
前述之第一乾式混粉製程與第二乾式混粉製程的進行均不額外添加有機溶劑或其他具有相似功效之載體，故本發明之第一乾式混粉製程與第二乾式混粉製程可減少溶劑之使用，而達到環保減廢之要求。 The aforementioned first dry powder mixing process and the second dry powder mixing process do not add additional organic solvents or other carriers with similar effects, so the first dry powder mixing process and the second dry powder mixing process of the present invention can reduce The use of solvents meets the requirements of environmental protection and waste reduction.
於進行操作130後，對所形成之金屬氟化物-金屬鋁-氟化鋰複合粉體進行熱壓製程，以製得本發明之中子減速材料，如操作140與操作150所示。於進行熱壓製程時，金屬氟化物-金屬鋁-氟化鋰複合粉體可於高溫高壓下被成
型並緻密化，而使所製得之中子減速材料具有不小於99.5%的相對密度，且於中子減速材料中，最大顆粒之粒徑係不大於500μm。故，本案所製得之中子減速材料具有細緻且均勻之組織，而可滿足應用之需求。
After performing
在一些實施例中，熱壓製程之溫度可為550℃至620℃，而壓力可為5MPa至55MPa。當熱壓製程之溫度與壓力為前述之範圍時，金屬氟化物-金屬鋁-氟化鋰複合粉體可較有效地被緻密化，而形成可滿足應用需求之中子減速材料。在此些實施例中，熱壓製程之時間可為1小時至6小時。當熱壓製程之時間為此範圍時，熱壓製程對於金屬氟化物-金屬鋁-氟化鋰複合粉體可具有更佳之緻密化效果，而有助於提升所製得中子減速材料之性質。 In some embodiments, the temperature of the hot pressing process may be 550° C. to 620° C., and the pressure may be 5 MPa to 55 MPa. When the temperature and pressure of the hot pressing process are within the aforementioned range, the metal fluoride-metal aluminum-lithium fluoride composite powder can be more effectively densified to form a neutron moderator material that can meet the application requirements. In these embodiments, the time of the hot pressing process may be 1 hour to 6 hours. When the time of the hot pressing process is within this range, the hot pressing process can have a better densification effect on the metal fluoride-metal aluminum-lithium fluoride composite powder, which helps to improve the properties of the neutron moderator material .
其次，經熱壓製程後，本發明所製得之中子減速材料的得料率不小於95%，故本發明之製作方法可有效地製得中子減速材料，而可降低其製作成本。 Secondly, after the hot pressing process, the yield of the neutron moderating material produced by the present invention is not less than 95%, so the production method of the present invention can effectively produce the neutron moderating material and reduce its production cost.
在一些應用例中，本發明經熱壓製程所製得之中子減速材料具有特定之組成，且具有緻密均勻的組織，故可作為硼中子捕獲治療設備之中子減速材料。 In some application examples, the neutron moderating material produced by the hot pressing process of the present invention has a specific composition and has a dense and uniform structure, so it can be used as a neutron moderating material for boron neutron capture therapy equipment.
以下利用實施例以說明本發明之應用，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。 The following examples are used to illustrate the application of the present invention, but they are not intended to limit the present invention. Anyone skilled in this art can make various changes and modifications without departing from the spirit and scope of the present invention.
實施例1 Example 1
首先，提供58.5體積百分比之氟化鎂、40體積 百分比之金屬鋁與1.5體積百分比之氟化鋰，且氟化鎂、金屬鋁與氟化鋰之純度均大於99.5%，其中金屬鋁之平均粒徑為5μm，而氟化鋰之平均粒徑為1μm。然後，將1.5體積百分比之氟化鋰與15體積百分比之金屬鋁放入高效混合設備中，以進行第一乾式混粉製程，以形成金屬鋁-氟化鋰複合粉體。其中，第一乾式混粉製程之時間為30分鐘。 First, provide 58.5% by volume of magnesium fluoride, 40% by volume percentage of metallic aluminum and 1.5% by volume of lithium fluoride, and the purity of magnesium fluoride, metallic aluminum and lithium fluoride is greater than 99.5%, wherein the average particle size of metallic aluminum is 5 μm, and the average particle size of lithium fluoride is 1 μm. Then, put 1.5 volume percent of lithium fluoride and 15 volume percent of metal aluminum into a high-efficiency mixing device to perform the first dry powder mixing process to form metal aluminum-lithium fluoride composite powder. Wherein, the time of the first dry powder mixing process is 30 minutes.
於進行第一乾式混粉製程後，將25體積百分比之金屬鋁與58.5體積百分比之氟化鎂添加至高效混合設備中，以與金屬鋁-氟化鋰複合粉體進行第二乾式混粉製程，而形成氟化鎂-金屬鋁-氟化鋰複合粉體。其中，第一乾式混粉製程之時間為60分鐘。 After the first dry powder mixing process, 25 volume percent aluminum and 58.5 volume percent magnesium fluoride are added to the high-efficiency mixing equipment for the second dry powder mixing process with metal aluminum-lithium fluoride composite powder , and form magnesium fluoride-metal aluminum-lithium fluoride composite powder. Wherein, the time of the first dry powder mixing process is 60 minutes.
接著，將所形成之氟化鎂-金屬鋁-氟化鋰複合粉體倒入石墨熱壓模具中，並於550℃下，以50MPa之壓力進行熱壓製程。經熱壓成型與緻密化6小時後，即可製得實施例1之氟化鎂-金屬鋁-氟化鋰複合材料(即中子減速材料)，其組成為58.5%氟化鎂-40%金屬鋁-1.5氟化鋰%，並以電子顯微鏡觀察實施例1之中子減速材料的顯微組織(如圖2A所示)。實施例1之中子減速材料的得料率為96%。 Next, pour the formed magnesium fluoride-metal aluminum-lithium fluoride composite powder into a graphite hot-pressing mold, and perform a hot-pressing process at 550° C. and a pressure of 50 MPa. After hot pressing and densification for 6 hours, the magnesium fluoride-metal aluminum-lithium fluoride composite material (i.e. neutron moderator material) of Example 1 can be obtained, and its composition is 58.5% magnesium fluoride-40% Metal aluminum-1.5% lithium fluoride, and the microstructure of the neutron moderator material in Example 1 was observed with an electron microscope (as shown in FIG. 2A ). The yield of neutron moderating material in Example 1 was 96%.
實施例2 Example 2
首先，提供69體積百分比之氟化鋁、30體積百分比之金屬鋁與1體積百分比之氟化鋰，且氟化鋁、金屬鋁與氟化鋰之純度均大於99.5%，其中金屬鋁之平均粒徑 為10μm，而氟化鋰之平均粒徑為2μm。然後，將1體積百分比之氟化鋰與20體積百分比之金屬鋁放入高效混合設備中，以進行第一乾式混粉製程，以形成金屬鋁-氟化鋰複合粉體。其中，第一乾式混粉製程之時間為45分鐘。 First, provide 69% by volume of aluminum fluoride, 30% by volume of metallic aluminum, and 1% by volume of lithium fluoride, and the purity of aluminum fluoride, metallic aluminum, and lithium fluoride are all greater than 99.5%, and the average particle size of metallic aluminum path is 10 μm, and the average particle size of lithium fluoride is 2 μm. Then, put 1 volume percent of lithium fluoride and 20 volume percent of metal aluminum into a high-efficiency mixing device to perform the first dry powder mixing process to form metal aluminum-lithium fluoride composite powder. Wherein, the time of the first dry powder mixing process is 45 minutes.
於進行第一乾式混粉製程後，將10體積百分比之金屬鋁與69體積百分比之氟化鋁添加至高效混合設備中，以與金屬鋁-氟化鋰複合粉體進行第二乾式混粉製程，而形成氟化鋁-金屬鋁-氟化鋰複合粉體。其中，第一乾式混粉製程之時間為45分鐘。 After the first dry powder mixing process, 10 volume percent aluminum and 69 volume percent aluminum fluoride are added to the high-efficiency mixing equipment for the second dry powder mixing process with metal aluminum-lithium fluoride composite powder , to form aluminum fluoride-metal aluminum-lithium fluoride composite powder. Wherein, the time of the first dry powder mixing process is 45 minutes.
接著，將所形成之氟化鋁-金屬鋁-氟化鋰複合粉體倒入石墨熱壓模具中，並於620℃下，以5MPa之壓力進行熱壓製程。經熱壓成型與緻密化3小時後，即可製得實施例2之氟化鋁-金屬鋁-氟化鋰複合材料(即中子減速材料)，其組成為69%氟化鋁-30%金屬鋁-1氟化鋰%，並以電子顯微鏡觀察實施例2之中子減速材料的顯微組織(如圖2B所示)。實施例2之中子減速材料的得料率為99.9%。 Next, the formed aluminum fluoride-metal aluminum-lithium fluoride composite powder was poured into a graphite hot-pressing mold, and a hot-pressing process was carried out at 620° C. under a pressure of 5 MPa. After hot pressing and densification for 3 hours, the aluminum fluoride-metal aluminum-lithium fluoride composite material (i.e. neutron moderator material) of Example 2 can be obtained, and its composition is 69% aluminum fluoride-30% Metal aluminum-1% lithium fluoride, and the microstructure of the neutron moderator material in Example 2 was observed with an electron microscope (as shown in Figure 2B). The yield of neutron moderating material in Example 2 was 99.9%.
請參照圖2A與圖2B。實施例1與實施例2所製得之中子減速材料均具有緻密且均勻之組織，故可應用於中子捕獲設備。其中，實施例1之中子減速材料的相對密度為99.6%，且其中最大顆粒組織的粒徑係小於250μm，而實施例2之中子減速材料的相對密度為99.9%，且其最大顆粒組織的粒徑係小於150μm。 Please refer to FIG. 2A and FIG. 2B . Both the neutron moderating materials prepared in Example 1 and Example 2 have dense and uniform structures, so they can be applied to neutron capture devices. Among them, the relative density of the neutron moderating material in Example 1 is 99.6%, and the particle size of the largest particle structure is less than 250 μm, while the relative density of the neutron moderating material in Example 2 is 99.9%, and the largest particle structure is The particle size is less than 150μm.
據此，藉由本發明中子減速材料及其製作方法，其係分階段地混合金屬氟化物粉體、氟化鋰粉體與金屬鋁粉體，而可有效地將氟化鋰粉體嵌埋於金屬鋁粉體之表面，進而可有助於提升所製得中子減速材料的性質。其中，藉由分階段進行的乾式混粉製程，金屬氟化物粉體、氟化鋰粉體與金屬鋁粉體可均勻地混合，而有助於提升中子減速材料的品質，並可提升其得料率。另外，由於本發明之混粉製程不須額外添加有機溶劑或其他液態載體，故可達到環保減廢之要求，並可降低製作成本。 Accordingly, with the neutron moderator material and the manufacturing method thereof of the present invention, the metal fluoride powder, the lithium fluoride powder and the metal aluminum powder are mixed in stages to effectively embed the lithium fluoride powder On the surface of the metal aluminum powder, it can help to improve the properties of the neutron moderator material. Among them, through the staged dry powder mixing process, metal fluoride powder, lithium fluoride powder and metal aluminum powder can be uniformly mixed, which helps to improve the quality of neutron moderator materials, and can improve their Yield. In addition, since the powder mixing process of the present invention does not need to add additional organic solvents or other liquid carriers, it can meet the requirements of environmental protection and waste reduction, and can reduce production costs.
雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，在本發明所屬技術領域中任何具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field of the present invention can make various modifications and changes without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.
100:方法 100: method
110,120,130,140,150:操作 110, 120, 130, 140, 150: operation
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