TWI296999B - Mold for molding glass optical articles - Google Patents

Description

1296999 V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a mold core, and more particularly to a mold having a high hardness and easy release. [Prior Art] Molding is widely used in the molding process, especially in the manufacture of optical glass products, such as aspherical glass lenses, ball lenses, crucibles, etc. Direct optical molding can be directly produced by Direct Press-molding technology. There is no need for subsequent processing steps such as grinding and polishing, which can greatly improve the production rate and output' and the product quality is good. However, the direct compression molding method requires very high requirements for chemical stability, thermal shock resistance, mechanical strength, and surface smoothness of the mold. Therefore, the development of compression molding technology actually depends mainly on the improvement of mold core materials and mold manufacturing technology. Generally, the mold core has the following requirements: a. At high temperature, it has good rigidity and hardness sufficient for mechanical impact; b. The mold does not produce grain under the thermal shock of repeated and rapid heating and cooling. Deformation; Clothing c. In the high J Kun time mold surface molding and optical glass does not occur, do not adhere to the glass; long d. no high temperature oxidation; surface finish profile e: good processing performance, easy to process into high Accuracy and high table f. Low cost. Most of the traditional mold cores use non-recorded steel or heat-resistant alloy as the mold material.

V. Description of the invention (2), f-mould is prone to high-temperature oxidation, and under the action of repeated thermal shock, the granules grow up, so that the surface of the mold is roughened and the glass is bonded. In order to solve the above problems, non-metal and super-hard alloys are used for the mold core. Nuclear = bismuth (SiC), tantalum nitride (Ten), titanium carbide (Tic), carbonized ‘· * and sedative crane-speaking alloys have been used to make molds. However, the above-mentioned stolen pottery has a very high hardness and is difficult to process into a desired shape, in particular, a two-precision aspherical shape. In addition to being difficult to process, superhard alloys may undergo high temperature oxidation after a period of time. Secondly, the carbide or super-hard alloy is used as the base of the mold, and the composite structure with the layered coating on the surface becomes a new development direction. Optical Glass Production::4: ?5,948 Reveals a Kind for Direct Molding: Sub! The structure of the glass is combined with the mold. It adopts high-strength superhardness, shouting ceramics or metal ceramics as the base of the mold = formed with a silver (8) film layer, or Ir and face (pt), chain, = core (:=) or, Alloy film layer 'or _ film layer or alloy film layer of Ru Re, Os, Rh. Acupuncture sputum or its alloy resources are scarce and expensive, so that the two carbides or metal ceramics are used as the base of the mold, and the key (second class: belongs to i xin: in the process of ϊ knot, it is necessary to add Ming (c〇), nickel ((1) J molybdenum (Mo) and other metal bismuth as an additive, so that after the mold is long, some of the 7L will diffuse through the noble metal layer to react with the glass to be molded, and the quality of the molded glass product. In addition to the above-mentioned formation of the precious metal film layer, there is also the use of electricity chemical gas 1296999

Deposition method (T herma 1), this film layer is formed in a thin film of tantalum carbide or tantalum nitride by 'Plasma CVD or thermal chemical vapor phase CVD. It is easy to adhere at 400 degrees. Optical glass products are not easy to demould. It is necessary to prevent the mold core from being adhered to the mold and to prevent the glass from sticking to the mold when it is released. A chemical stability is good [Contents] In order to solve the above problems of the prior art, the object of the present invention is to provide a replacement which is high in mechanical strength, prevents diffusion of metal elements, and is easily released. To achieve the object of the present invention, the present invention provides a cocoon having an ultra-hard coating comprising: a matrix of 2 in a core having a molding surface corresponding to the product to be molded; and a superhard covering the molding surface Membrane layer. ^ The matrix system is made of ceramic, cermet or superhard alloy, including SiC, Si, Si3N4, Zr02, A 1203, TiN, Ti02, TiC, B4C, WC, W or WC-Co. The super-hard film layer includes an amorphous boron-carbon nitrogen material matrix and a cubic boron nitride particle and diamond carbon particles distributed on the substrate. The amorphous boron-carbon ruthenium material-based system is continuously distributed, and the cubic boron nitride particles and the diamond carbon particles are discretely or partially distributed therein, and the particle diameters of the cubic boron nitride particles and the diamond carbon particles are Within 1 0 0 nanometer range. The above superhard layer can be deposited or sputtered by plasma chemical vapor deposition

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Formed by law. Compared with the prior art, the surface of the present invention forms a super-hard film layer, and the mold product of the invention is adhered to the mold by easy use, and the hardness of the granule is extremely high, so that the mold hard layer can be improved. Prevent the adverse effects of the glass products of the matrix of the mold. [Embodiment] It is shown that the matrix of the matrix of the high-hardness mold is molded, and the lubricity of the boron-carbon-nitrogen-based material is not mechanically bonded to the optical glass cubic boron nitride particles and the diamond carbon micro-pressure surface. The supermetallic element is diffused so as to avoid further details of the invention, which will be described below with reference to the accompanying drawings. Referring to the first figure, a first embodiment of the present invention provides a mold core 10 for molding an aspherical 7 optical glass product, comprising a mold base 12 and a film layer η formed on the molding surface of the mold base 12. The mold base 12 can be obtained by sintering a ceramic, a cermet or a superhard alloy as a main material: SiC, Si, Si3N4, Zr02, Al2〇3, TiN, Ti02, TiC, WC, or WC. -Co. The molded surface of the matrix of the mold core i 2 corresponds to the shape of the aspherical optical glass product to be molded, i.e., aspherical. The film layer 14 is coated on the molding surface of the mold base 12, which includes an amorphous boron carbon nitride material 16 (a-BCN), and a cubic boron nitride particle 17 (Cubic Boron Nitride). And diamond carbon particles 18. A 16-series continuous layer of amorphous boron-carbon nitrogen material can be used as a matrix for distribution of cubic boron nitride particles 17 and diamond carbon particles 18; and cubic boron nitride particles 17 and diamond carbon particles 18 are discrete or partially Continuously distributed in the entire matrix of amorphous boron-carbon nitrogen materials, the content of which is 1 〇 % of the total thickness of the film layer 丨4

1296999

V. Description of invention (5) : 〇 /. (Moore 100% ratio). Cubic boron nitride particles η and inside. = The thickness of the film layer U can be in the range of i micrometer to 1 〇〇 micron. Of course, the invention can be used not only for the molding of aspherical optical glass products: 'It can also be applied to other molded products of different shapes and different uses. two-. Referring to the second figure, a second embodiment of the present invention provides a mold core for a mold-plane optical glass product, comprising a mold base having a smooth plane, 22, and a film layer covering the smooth plane. twenty four. The mold core 2 2 can be obtained by sintering the following ceramic, cermet or super hard alloy as main materials: SiC, Si, Si3N4, Zr02, Al2〇3, TiN,

Ti02 'TiC, B4C, WC, W or WC-Co. The thin film layer 24 includes an amorphous carbon-depleted nitrogen material 26, cubic boron nitride fine particles π, and diamond carbon fine particles 28. Amorphous rotten carbon-nitrogen material 26 is a continuous layer which can be used as a matrix for distribution of cubic boron nitride particles 27 and diamond carbon particles 28; and cubic boron nitride particles 27 and diamond carbon particles 28 are discrete or partially continuous. The content of the entire amorphous boron carbonitride material 26 is 10% to 60% by mole based on the total amount of the film layer 24. The cubic boron nitride particles 27 and the diamond carbon particles 28 have a particle diameter in the range of 1-1 00 nm, preferably in the range of 5 丨 00 nm. The thickness of the film layer 24 can range from 1 micron to 1 micron. In the above two embodiments, the matrix bases 12 and 22 are prepared by sintering or other processing methods, and the film layers 14 and 24 may be formed by plasma chemical vapor deposition (Plasma Chemical Vapor Deposition) or sputtering, including Microwave Plasma Chemical Vapor Deposition, Co-Sputtering

Page 9 1296999 V. Description of the invention (6) or Reactive Sputtering. The mold core 10 (20) of the present invention has the advantages of high hardness and high mechanical strength of the mold base 12 (22), and can withstand the pressure and stress generated during high temperature molding. The molding surface is covered by a film layer 14 (24) composed of a non-metallic material that is not easily oxidized, including a soft amorphous boron carbonitride material 丨6 (26) and a high hardness cubic boron nitride particle. 17 (27) and diamond carbon particles 18 (28), which lubricate boron is small and high. The other elements of the metal of this invention are chemically stable and put forward special cases. The self-skills should cover that the amorphous boron-carbon nitrogen material 16 6 ( 2 6 ) contains sp2 bonding, which makes it good, so the molded glass product is easy to demould. The cubic crystal nitrogen particles 17 (27) and the diamond carbon particles 18 (28) have high hardness, the particle size can enhance the mechanical strength of the surface of the mold, and the precision of the molded surface is also improved, and the film layer 14 (24) is also The gold of the matrix base 12 (22) can be prevented from penetrating and diffusing to the outside of the film layer 14 (24) during use, thereby preventing the element from discoloring the glass and affecting the quality of the optical glass. In summary, the mold core with super-hard coating has the characteristics of high mechanical strength, excellent resistance and easy demolding. As described above, the present invention has indeed met the requirements of the invention patent, and the above-mentioned ones are only the preferred implementation of the present invention, which cannot be used to limit the φ 杳 杳 杳 丨 丨 丄 丄 丄α > armor guides the target circumference. The equivalents of the spirit of the present invention, which is familiar to the person skilled in the present invention, are within the scope of the following patent application. ι

Page 10 1296999 BRIEF DESCRIPTION OF THE DRAWINGS The first drawing is a schematic view of a mold for molding an aspherical optical glass product according to a first embodiment of the present invention; and the second embodiment is a mold for molding a flat optical glass product according to a second embodiment of the present invention. Schematic diagram of Ren. [Main component symbol description] Molding 10,20 Mold base 12,22 Film layer 14,24 Amorphous boron carbon nitride material 16,26 Cubic boron nitride particles 1 7,2 7

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Claims (1)

^m\6. Patent application scope 1. A mold core having a super-hard coating, comprising: a mold core body having a molding surface; and a super hard film layer covering the molding surface of the mold core body; The superhard film layer comprises a continuous matrix of amorphous boron carbon nitride material, cubic boron nitride particles and diamond carbon particles distributed in the matrix of the amorphous carbon-depleting material. 2. The mold core having super-hard coating as described in claim 1, wherein the mold-based system is composed of SiC, Si, Si3N4, Zr02, Α12〇3, TiN, Ti02, TiC, B4C, WC, W Or made of WC-Co material. 3. A mold having a super-hard coating as described in claim 2, wherein the mold-based system is sintered. 4. The mold having an ultra-hard coating as described in claim 1, wherein the super-hard film layer is deposited by plasma chemical vapor deposition or sputtering. 5. The mold having an ultra-hard coating as described in claim 1, wherein the superhard layer has a thickness in the range of 1 micrometer to 100 micrometers. 6. The mold having an ultra-hard coating according to claim 1, wherein the cubic boron nitride fine particles and the diamond carbon fine particles have a molar percentage of 10% to 60%. 7. The mold having an ultra-hard coating as described in claim 1, wherein the cubic boron nitride particles and the diamond carbon particles have a particle diameter in the range of 1 to 100 nm. 8. The mold core having the super-hard coating as described in claim 7 wherein the cubic nitride nitride particles and the diamond carbon particles have a particle size of 5~ Page 12 1296999 VI. The scope of application for patents is within the range of 100 nanometers. 9. The mold core having an ultra-hard coating as described in claim 1, wherein the mold surface of the mold core is aspherical. A mold having an ultra-hard coating as described in claim 1, wherein the mold face of the mold is flat. Page 13