1339139 _ 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種合金加工工具及其被覆劑，尤其涉及 一種鎮合金等低炫點合金加工工具及其被覆劑。 【先前技術】 鎂合金不僅具有密度低、比強度與比剛度高之優點， 還具有阻尼性能好、切削加工性好、導熱性好、電磁遮罩 能力強等優點。於汽車工業、通訊電子工業與航空航天工 • 業等領域正得到日益廣泛之應用。 鎂合金等低熔點合金熔化、澆注、運送等過程中，合 金熔液會與鑄模、坩堝、湯勺等加工工具接觸。由於熔融 之合金加工溫度較高，會對加工工具表面造成侵餘，故必 須對其加以保護，以延長使用壽命。同時，必須防止加工 工具與合金熔液接觸時，鐵元素以及雜質等對合金熔液之 污染與滲透。最有效之措施為於加工工具之與合金熔液接 I 觸之部位塗覆一層被覆劑。 目前，鎂合金等低熔點合金生產中使用之被覆劑大多 以氮化硼為骨料配製而成，氮化硼具有良好之高溫潤滑性 與高溫穩定性，將其塗覆於加工工具表面，可藉由隔離作 用避免合金熔液對加工工具造成化學侵蝕，同時有助於合 金熔液脫模。惟，氮化硼價格較貴，使得於鎂合金等低熔 點合金之加工過程中，採用以氮化硼為骨料配製之被覆劑 保護加工工具之成本較高。 6 1339139 【發明内容】 鑒於上述狀況，有必要提供一種成本低、保護效果好 之新型被覆劑及使用該新型被覆劑之合金加工工具。 一種被覆劑，以重量計，該被覆劑包括100份之氟化 鈣、0.7〜3.3份之硼酸、5.5〜11份之粘結劑。 一種合金加工工具，其與合金·溶液接觸之部位塗覆有 一層被覆劑，以重量計，該被覆劑包括100份之氟化妈、 0.7〜3.3份之硼酸、5.5〜11份之粘結劑。 由於被覆劑中之氟化鈣具有良好之高溫潤滑性，且具 有化學惰性；硼酸具有良好之防腐性能，且熔融狀態下之 硼酸亦會顯示出優良之潤滑性能；粘結劑可使被覆劑具有 更好之附著力，避免被覆劑於合金熔液流動之過程中從加 工工具表面脫落。故，該被覆劑可牢固地附著於加工工具 表面，有效隔離合金熔液，保護加工工具表面不被合金熔 液侵蝕之同時，防止加工工具中之鐵元素以及雜質等對合 金熔液造成污染與滲透。且該被覆劑有助於合金熔液之脫 模，使得合金產品具有良好之表面光潔度。因氟化鈣價格 遠低於氮化硼，使得該被覆劑之生產成本較低，從而於鎂 合金等低熔點合金之加工過程中，用於保護加工工具之成 本較低。 【實施方式】 下面將結合較佳實施例對本發明之被覆劑及使用其 之合金加工工具做進一步之詳細說明。 實施例一：以重量計，被覆劑由100份之氟化鈣、2 7 1339139 .份之硼酸、8份之粘結劑以及100份之水組成。 其中粘結劑為矽酸鈉、矽酸鉀等矽酸鹽，優選為矽酸 納；水優選為蒸顧水。 該被覆劑之製造方法包括以下步驟：（1)將5份之水加 熱至70°C至l〇〇°C，加入2份之硼酸，攪拌直至硼酸全部 溶化；（2)將20份水加熱至70°C至l〇〇°C，加入8份之粘 結劑，攪拌直至粘結劑全部溶化；（3)將100份之氟化鈣、 步驟（1)制得之硼酸溶液、步驟（2)制得之粘結劑溶液以及剩 • 餘之75份水混合並攪拌均勻。 一種合金加工工具，其與合金熔液接觸之部位塗覆有 一層被覆劑，以重量計，該被覆劑包括1〇〇份之氟化鈣、 2份之硼酸、8份之粘結劑。 該合金為鎂合金等低熔點合金，該加工工具為鑄模、 坩堝、湯勺等。 將被覆劑應用於加工工具表面之方法為：將加工工具 ^ 之表面清理乾淨，並將加工工具預熱至180°C至250°C ; 然後將被覆劑喷塗於加工工具表面，並將加工工具加熱至 300°C至400°C，烘乾10分鐘至20分鐘，待被覆劑固化成 膜後便可使用加工工具。 由於被覆劑中之氟化鈣具有良好之潤滑性，且具有化 學惰性；硼酸具有良好之防腐性能，且熔融狀態下之硼酸 亦會顯示出優良之潤滑性能，當溫度較高時，硼酸產生流 體動力效應，有助於被覆劑於加工工具表面均勻鋪開；粘 結劑可使被覆劑具有更好之附著力，避免被覆劑於合金熔 8 1339139 .液流動之過程中從加工工具表面脫落。故，該被覆劑可牢 固地附著於加工工具表面，有效隔離合金熔液，保護加工 工具表面不被合金熔液侵蝕之同時，防止加工工具中之鐵 元素以及雜質等對合金熔液造成污染與滲透。另，該被覆 劑有助於合金熔液之脫模，使得合金產品具有良好之表面 光潔度。 由於氟化鈣與硼酸於較高之溫度下，依然具有良好之 潤滑性與穩定性，使得該被覆劑之應用溫度範圍較寬，為 • 600°C至900°C，而鎂合金等熔融之低熔點合金加工溫度最 高為800°C左右，故該被覆劑完全可於鎂合金等低熔點合 金生產過程中對加工工具起到良好之保護作用。另，因氟 化鈣價格遠低於氮化硼，使得該被覆劑之生產成本較低， 從而可於實現良好保護效果之同時，降低加工工具之保護 成本。 可以理解，本發明之被覆劑還可有其他較佳實施例， 鲁 例如： 實施例二：以重量計，被覆劑由100份之氟化鈣、0.7 份之硼酸、5.5份之粘結劑以及105份之水組成。 該被覆劑之製造方法包括以下步驟：（1)將3份之水加 熱至70°C至100°C，加入0.7份之硼酸，攪拌直至硼酸全 部溶化；（2)將12份之水加熱至70°C至100°C，加入5.5 份之粘結劑，攪拌直至粘結劑全部溶化；（3)將100份之氟 化鈣、步驟（1)制得之硼酸溶液、步驟(2)制得之粘結劑溶液 以及剩餘之90份之水混合並攪拌均勻。 9 1339139 實施例三：以重量計，被覆劑由100份之氟化妈、3·3 份之硼酸、11份之粘結劑以及120份之水組成。 該被覆劑之製造方法包括以下步驟：（1)將8份之水加 熱至70°C至100°C，加入3.3份之硼酸，攪拌直至硼酸全 部溶化；（2)將22份之水加熱至70°C至100°C，加入11份 之粘結劑，攪拌直至粘結劑全部溶化；（3)將100份之氟化 鈣、步驟（1)制得之硼酸溶液、步驟（2)制得之粘結劑溶液以 及剩餘之90份之水混合並攪拌均勻。 實施例四：以重量計，被覆劑由100份之氟化鈣、1 份之硼酸、6份之粘結劑以及110份之水組成。 該被覆劑之製造方法包括以下步驟：（1)將3份之水加 熱至70°C至l〇〇°C，加入1份之硼酸，攪拌直至硼酸全部 溶化；（2)將12份之水加熱至70°C至l〇〇°C，加入6份之 粘結劑，攪拌直至粘結劑全部溶化；（3)將100份之氟化鈣、 步驟（1)制得之硼酸溶液、步驟（2)制得之粘結劑溶液以及剩 餘之95份之水混合並攪拌均勻。 實施例五：以重量計，被覆劑由100份之氟化鈣、3 份之硼酸、10份之粘結劑以及120份之水組成。 該被覆劑之製造方法包括以下步驟：（1)將7份之水加 熱至70°C至l〇〇°C，加入3份之硼酸，攪拌直至硼酸全部 溶化；（2)將20份之水加熱至70°C至100°C，加入10份之 粘結劑，攪拌直至粘結劑全部溶化；（3)將100份之氟化鈣、 步驟（1)制得之硼酸溶液、步驟(2)制得之粘結劑溶液以及剩 餘之93份之水混合並攪拌均勻。 1339139 . 將上述實施例中之被覆劑應用於加工工具表面時，將 加工工具之表面清理乾淨，並將加工工具預熱至180°C至 250°C ;然後將被覆劑喷塗於加工工具表面，並將加工工 具加熱至300°C至400°C，烘乾10分鐘至20分鐘，待被 覆劑固化成膜後便可使用加工工具。 綜上所述，本發明確已符合發明專利要件，爰依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施例， 舉凡熟悉本案技藝之人士，於援依本案發明精神所作之等 • 效修飾或變化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 . 無 【主要元件符號說明】 無1339139 _ IX DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an alloy processing tool and a coating agent thereof, and more particularly to a low-point alloy processing tool such as a town alloy and a coating agent thereof. [Prior Art] Magnesium alloy not only has the advantages of low density, high specific strength and specific rigidity, but also has the advantages of good damping performance, good machinability, good thermal conductivity, and strong electromagnetic shielding ability. It is increasingly used in the automotive industry, communications electronics industry and aerospace industry. In the process of melting, pouring, and transporting low-melting alloys such as magnesium alloys, the alloy melt is in contact with processing tools such as molds, enamels, and spoons. Due to the high processing temperature of the molten alloy, it will cause damage to the surface of the processing tool and must be protected to extend its service life. At the same time, it is necessary to prevent contamination and penetration of the alloy melt by iron elements and impurities when the processing tool comes into contact with the alloy melt. The most effective measure is to apply a layer of coating agent to the part of the processing tool that is in contact with the alloy melt. At present, most of the coating materials used in the production of low-melting alloys such as magnesium alloys are prepared by using boron nitride as an aggregate. Boron nitride has good high-temperature lubricity and high-temperature stability, and is coated on the surface of the processing tool. By means of the isolation, the alloy melt is prevented from causing chemical attack on the processing tool, and at the same time, the alloy melt is released. However, the price of boron nitride is relatively high, so that the cost of protecting the processing tool with a coating material prepared by using boron nitride as an aggregate is high in the processing of a low-melting point alloy such as a magnesium alloy. 6 1339139 SUMMARY OF THE INVENTION In view of the above circumstances, it is necessary to provide a novel coating agent which is low in cost and excellent in protection effect, and an alloy processing tool using the same. A coating agent comprising 100 parts by weight of calcium fluoride, 0.7 to 3.3 parts of boric acid, and 5.5 to 11 parts by weight of a binder. An alloy processing tool, the portion in contact with the alloy solution is coated with a coating agent comprising 100 parts of fluoride mother, 0.7 to 3.3 parts of boric acid, and 5.5 to 11 parts by weight of the coating agent. . Since the calcium fluoride in the coating agent has good high-temperature lubricity and is chemically inert; boric acid has good anti-corrosion property, and boric acid in a molten state also exhibits excellent lubricating properties; the binder can have a coating agent Better adhesion, avoiding the coating agent falling off the surface of the processing tool during the flow of the alloy melt. Therefore, the coating agent can be firmly adhered to the surface of the processing tool, effectively isolating the alloy melt, protecting the surface of the processing tool from being eroded by the alloy melt, and preventing iron and impurities in the processing tool from contaminating the alloy melt. penetration. Moreover, the coating agent contributes to the demolding of the alloy melt, so that the alloy product has a good surface finish. Since the price of calcium fluoride is much lower than that of boron nitride, the production cost of the coating agent is low, so that the cost for protecting the processing tool is low during the processing of a low melting point alloy such as a magnesium alloy. [Embodiment] Hereinafter, a coating agent of the present invention and an alloy processing tool using the same will be further described in detail in conjunction with preferred embodiments. Example 1: The coating composition consisted of 100 parts of calcium fluoride, 2,731,139 parts of boric acid, 8 parts of binder, and 100 parts by weight of water. The binder is a citrate such as sodium citrate or potassium citrate, preferably sodium citrate; and the water is preferably distilled water. The method for producing the coating agent comprises the following steps: (1) heating 5 parts of water to 70 ° C to 10 ° C, adding 2 parts of boric acid, stirring until the boric acid is completely dissolved; (2) heating 20 parts of water To 70 ° C to l ° ° C, add 8 parts of the binder, stir until the binder is completely dissolved; (3) 100 parts of calcium fluoride, the boric acid solution prepared in step (1), the step ( 2) Mix the prepared binder solution and the remaining 75 parts of water and mix well. An alloy processing tool in which a portion in contact with an alloy melt is coated with a coating agent comprising, by weight, 1 part of calcium fluoride, 2 parts of boric acid, and 8 parts of a binder. The alloy is a low melting point alloy such as a magnesium alloy, and the processing tool is a mold, a crucible, a soup spoon, or the like. The method of applying the coating agent to the surface of the processing tool is: cleaning the surface of the processing tool and preheating the processing tool to 180 ° C to 250 ° C; then spraying the coating agent on the surface of the processing tool and processing The tool is heated to 300 ° C to 400 ° C and dried for 10 minutes to 20 minutes. After the coating is cured to form a film, the processing tool can be used. Since the calcium fluoride in the coating agent has good lubricity and is chemically inert; boric acid has good anticorrosive properties, and boric acid in a molten state also exhibits excellent lubricating properties, and when the temperature is high, boric acid generates a fluid. The dynamic effect helps the coating agent to spread evenly on the surface of the processing tool; the adhesive can make the coating agent have better adhesion and prevent the coating agent from falling off from the surface of the processing tool during the flow of the alloy. Therefore, the coating agent can be firmly adhered to the surface of the processing tool, effectively isolating the alloy melt, protecting the surface of the processing tool from being eroded by the alloy melt, and preventing iron and impurities in the processing tool from contaminating the alloy melt. penetration. In addition, the coating aids in the release of the alloy melt, resulting in a good surface finish of the alloy product. Since calcium fluoride and boric acid still have good lubricity and stability at a relatively high temperature, the coating agent has a wide application temperature range of 600 ° C to 900 ° C, and the magnesium alloy is melted. The processing temperature of the low melting point alloy is up to about 800 ° C, so the coating agent can completely protect the processing tool in the production process of the low melting point alloy such as magnesium alloy. In addition, since the price of calcium fluoride is much lower than that of boron nitride, the production cost of the coating agent is low, so that a good protection effect can be achieved while reducing the protection cost of the processing tool. It will be understood that the coating composition of the present invention may have other preferred embodiments, for example: Example 2: The coating agent comprises 100 parts of calcium fluoride, 0.7 parts of boric acid, 5.5 parts of binder, and 105 parts of water. The method for producing the coating agent comprises the following steps: (1) heating 3 parts of water to 70 ° C to 100 ° C, adding 0.7 parts of boric acid, stirring until all the boric acid is dissolved; (2) heating 12 parts of water to 70 ° C to 100 ° C, add 5.5 parts of the binder, stir until the binder is completely dissolved; (3) 100 parts of calcium fluoride, the boric acid solution obtained in step (1), step (2) The resulting binder solution and the remaining 90 parts of water were mixed and stirred well. 9 1339139 Example 3: The coating consisted of 100 parts of fluorided mother, 3·3 parts of boric acid, 11 parts of binder and 120 parts by weight of water. The method for producing the coating agent comprises the following steps: (1) heating 8 parts of water to 70 ° C to 100 ° C, adding 3.3 parts of boric acid, stirring until all the boric acid is dissolved; (2) heating 22 parts of water to 70 ° C to 100 ° C, add 11 parts of the binder, stir until the binder is completely dissolved; (3) 100 parts of calcium fluoride, the boric acid solution obtained in step (1), step (2) The resulting binder solution and the remaining 90 parts of water were mixed and stirred well. Example 4: The coating composition consisted of 100 parts of calcium fluoride, 1 part of boric acid, 6 parts of binder, and 110 parts by weight of water. The method for producing the coating agent comprises the following steps: (1) heating 3 parts of water to 70 ° C to 10 ° C, adding 1 part of boric acid, stirring until all boric acid is dissolved; (2) 12 parts of water Heating to 70 ° C to l ° ° C, adding 6 parts of the binder, stirring until the binder is completely dissolved; (3) 100 parts of calcium fluoride, the boric acid solution prepared in step (1), the steps (2) The prepared binder solution and the remaining 95 parts of water are mixed and stirred uniformly. Example 5: The coating composition consisted of 100 parts of calcium fluoride, 3 parts of boric acid, 10 parts of binder, and 120 parts by weight of water. The method for producing the coating agent comprises the following steps: (1) heating 7 parts of water to 70 ° C to 10 ° C, adding 3 parts of boric acid, stirring until all the boric acid is dissolved; (2) 20 parts of water Heating to 70 ° C to 100 ° C, adding 10 parts of the binder, stirring until the binder is completely dissolved; (3) 100 parts of calcium fluoride, the boric acid solution obtained in the step (1), step (2) The prepared binder solution and the remaining 93 parts of water were mixed and stirred uniformly. 1339139. When applying the coating agent in the above embodiment to the surface of the processing tool, the surface of the processing tool is cleaned, and the processing tool is preheated to 180 ° C to 250 ° C; then the coating agent is sprayed on the surface of the processing tool. And the processing tool is heated to 300 ° C to 400 ° C, and dried for 10 minutes to 20 minutes, and the processing tool can be used after the coating agent is cured to form a film. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and those skilled in the art of the present invention should be included in the following claims. [Simple description of the diagram] . None [Key component symbol description] None
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