CN114888926A - Novel sealing material pressing device and process for synthetic diamond - Google Patents
Novel sealing material pressing device and process for synthetic diamond Download PDFInfo
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- CN114888926A CN114888926A CN202210333967.6A CN202210333967A CN114888926A CN 114888926 A CN114888926 A CN 114888926A CN 202210333967 A CN202210333967 A CN 202210333967A CN 114888926 A CN114888926 A CN 114888926A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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Abstract
The invention provides a novel device and a process for pressing a sealing material for synthesizing diamond. The novel synthetic diamond sealing material pressing device comprises: the sealing material pressing equipment comprises a novel pressing mold frame; the original pressing mold frame in the sealing material pressing equipment is replaced by the novel mold frame designed by the invention, and then the diamond is produced. The novel sealing material pressing device and the process for synthesizing the diamond, which are provided by the invention, have the advantages that the whole process performance of the pressure transmission and the sealing performance of the pressing die frame can be improved and optimized, so that the synthetic production process of the diamond becomes stable and is easy to control, the production efficiency can be improved, and harmful substances are prevented from entering the pressing die frame to influence the growth of the diamond.
Description
Technical Field
The invention belongs to the technical field of synthetic diamond, and particularly relates to a novel device and a process for pressing a sealing material for the synthetic diamond.
Background
Synthetic diamond, which is an artificial diamond, has been studied since the 18 th century after it was confirmed to be composed of pure carbon, and has been really successfully and rapidly developed only in the 50 th 20 th century by the development of high-pressure research and high-pressure experimental techniques, and has been widely used in various industries and process industries, the artificial diamond is a material in which non-diamond-structured carbon is artificially converted into diamond-structured carbon and single crystal and polycrystalline diamond are formed by nucleation and growth, or fine diamond is sintered into polycrystalline diamond at high pressure and high temperature, and when the synthetic diamond is produced, a pressing device is required to press and mold a sealing material for the synthetic diamond, and the conventional pressing device mostly uses a hydraulic pump to directly press the material, but the required pressure for the synthetic diamond is large, when a hydraulic pump directly presses a material, the material generates larger resilience force, the working pressure of the hydraulic pump is increased, and the hydraulic pump is easily damaged, so that the service life of the device is shortened; installing a bottom plate: a pressing mold frame is arranged in the middle of the upper surface of the die; a pressing mechanism: the lower end of the front side of the pressing mechanism is matched and corresponds to the pressing die frame; the check mechanism: the upper ends of the non-return mechanisms are respectively fixedly connected with the left side and the right side of the lower pressing mechanism; wherein: still include end sealing block, the lower extreme sliding connection of end sealing block is in the square mouth that the plate body middle part was seted up at suppression die frame bottom, and the upper end of end sealing block is coincided with the inside die cavity of suppression die frame and is corresponded, and this sealing material suppression device for synthetic diamond can alleviate the material and to the resilience force of top driver part, reduces driver part's operating pressure, improves the life of device at the material pressing in-process.
However, the above structure has disadvantages that the bottom seal block and the pressing mold frame in the pressing device are made of pyrophyllite, but the single pyrophyllite has a low friction coefficient (the pyrophyllite is 0.25), which causes the sealing performance to be poor, and the pyrophyllite generates phase change at high temperature to destroy the original pressure transmission performance, thereby causing pressure loss and large pressure gradient in the pressing mold frame, so that harmful substances in the pyrophyllite can easily enter the pressing mold frame to affect the growth of diamond.
Therefore, there is a need to provide a new sealing material pressing apparatus and process for synthetic diamond to solve the above problems.
Disclosure of Invention
The invention aims to provide a novel sealing material pressing device and a novel sealing material pressing process for synthetic diamond, which can improve and optimize the whole process performance of pressure transmission and sealing performance of a pressing mold frame, so that the synthetic production process of the diamond becomes stable and is easy to control, the production efficiency can be improved, and harmful substances are prevented from entering the pressing mold frame to influence the growth of the diamond.
In order to solve the technical problems, the novel device and the process for pressing the sealing material for the synthetic diamond, which are provided by the invention, comprise the following steps of:
the sealing material pressing equipment comprises a novel pressing mold frame;
an embodiment of the invention comprises raw materials, equipment and the novel pressing mold frame as claimed in any one of claim 1;
s1, raw materials and equipment:
(1) raw materials: pyrophyllite, dolomite and a forming agent (sodium silicate);
(2) an apparatus: a mixer, a press forming device and a firing device;
s2, step:
(1) proportionally adding pyrophyllite and a forming agent into a mixer for mixing and stirring, wherein the stirring time is 50min, and after the completion, storing for 24h for later use to form a sealing layer;
(2) adding dolomite and a forming agent into a mixer in proportion, mixing and stirring for 50min, and storing for 24h for later use after the stirring is finished so as to form a pressure transfer layer;
(3) bonding the sealing layer and the pressure transfer layer by using a forming agent;
(4) placing the bonded article into a compression molding device, and pressing the bonded article into a novel compression mold frame 5;
(5) and placing the formed novel bottom sealing block and the novel pressing mold frame into firing equipment for heat treatment so as to obtain a finished novel pressing mold frame.
As a further scheme of the invention, the pyrophyllite comprises a coarse material, a medium material and a fine material, wherein the particle size of the coarse material is 120 meshes, the content of the coarse material is 30 +/-1%, the particle size of the medium material is 140 meshes 170 meshes, the content of the medium material is 50 +/-1%, the particle size of the fine material is 170 meshes 200 meshes, and the content of the fine material is 20 +/-1%.
As a further scheme of the invention, the dolomite comprises coarse materials and fine materials, wherein the granularity of the coarse materials is 120 meshes, the content of the coarse materials is 80 +/-1%, the granularity of the fine materials is 150 meshes and 130 +/-1%.
As a further aspect of the present invention, the use requirements of the press molding apparatus include the following:
righting a pressing die on the pressing forming equipment without deviating from the central position of a potential plate of the pressing machine;
adjusting a pressure gauge to indicate pressure, and when pressurizing, properly positioning the pressure to ensure the molding size;
correcting the press mould once every 2000 blocks.
As a further scheme of the invention, the pressure of the compression molding equipment is 60-90 MPa.
As a further scheme of the invention, the temperature of the heat treatment is 50-280 ℃, and the temperature of the heat treatment is 3-6 h.
As a further scheme of the invention, the chemical composition of the sealing layer comprises aluminum oxide (Al) 2 O 3 ) Silicon dioxide (SiO) 2 ) Iron oxide (Fe) 2 O 3 ) And ferrous oxide (FeO), the aluminum oxide (Al) 2 O 3 ) Is 37-41%, and the silicon dioxide (SiO) 2 ) Is 41-51%, and the iron oxide (Fe) 2 O 3 ) Is 0.66-0.75%, and the ferrous oxide (FeO) is 1.24-2.96%.
As a further aspect of the invention, the chemical composition of the pressure transfer layer comprises silicon dioxide (SiO) 2 ) Magnesium oxide (MgO), calcium oxide (CaO) and magnesium carbonate (MgCO) 3 ) Said silicon dioxide (SiO) 2 ) 3.5-4.5%, the ratio of magnesium oxide (MgO) is 20-25%, the ratio of calcium oxide (CaO) is 25-30%, and the ratio of magnesium carbonate (MgCO) is 3 ) The proportion of (A) is 10-15%.
As a further scheme of the invention, the original bottom sealing block and the pressing mold frame in the pressing device are replaced by a new bottom sealing block and a new pressing mold frame.
Compared with the related technology, the novel sealing material pressing device and the process for synthesizing diamond provided by the invention have the following beneficial effects:
1. the novel pressing die frame formed by pressing the pressure transfer layer prepared from dolomite and the sealing layer prepared from pyrophyllite can improve and optimize the overall process performance of the pressure transfer and sealing performance of the pressing die frame, so that the synthetic production process of the diamond becomes stable and is easy to control, the production efficiency can be improved, and harmful substances are prevented from entering the pressing die frame to influence the growth of the diamond.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of a press apparatus of the present invention;
fig. 2 is a schematic block diagram of the present invention.
1. A sealing material pressing device; 2. novel die frame.
Detailed Description
Referring to fig. 1 and fig. 2, fig. 1 is a schematic view of a pressing apparatus according to the present invention; fig. 2 is a schematic block diagram of the present invention. The novel device and the process for pressing the sealing material for the synthetic diamond comprise the following steps:
the sealing material pressing equipment 1 comprises a novel pressing mold frame 5;
replacing an original pressing mold frame in the sealing material pressing equipment 1 with a novel mold frame 2 designed in the invention, and then producing the diamond;
in addition, the invention also provides a novel pressing process of the sealing material for the synthetic diamond.
An embodiment of the invention comprises raw materials, equipment and a novel press mold frame 5 according to any one of the claims 1;
s1, raw materials and equipment:
(1) raw materials: pyrophyllite, dolomite and a forming agent (sodium silicate);
(2) an apparatus: a mixer, a press forming device and a firing device;
s2, step:
(1) proportionally adding the pyrophyllite and the forming agent into a mixer for mixing and stirring for 50min, and after the stirring is finished, storing for 24h for later use to form a sealing layer;
(2) putting dolomite and a forming agent into a mixer in proportion, mixing and stirring for 50min, and storing for 24h for later use after the stirring is finished so as to form a pressure transfer layer;
(3) bonding the sealing layer and the pressure transfer layer by using a forming agent;
(4) placing the bonded article into a compression molding device, and pressing the bonded article into a novel compression mold frame 5;
(5) and placing the formed novel bottom sealing block and the novel pressing mold frame into firing equipment for heat treatment so as to obtain a finished novel pressing mold frame 5.
The pyrophyllite comprises a coarse material, a medium material and a fine material, wherein the granularity of the coarse material is 120 meshes, the content of the coarse material is 30 +/-1%, the granularity of the medium material is 140 meshes and 170 meshes, the content of the medium material is 50 +/-1%, the granularity of the fine material is 170 meshes and 200 meshes, and the content of the fine material is 20 +/-1%.
The dolomite comprises coarse materials and fine materials, wherein the granularity of the coarse materials is 120 meshes, the content of the coarse materials is 80 +/-1%, the granularity of the fine materials is 150 meshes, and the content of the fine materials is 20 +/-1%.
The use requirements of the press forming equipment comprise the following steps:
righting a pressing die on the pressing forming equipment without deviating from the central position of a potential plate of the pressing machine;
adjusting a pressure gauge to indicate pressure, and when pressurizing, properly positioning the pressure to ensure the molding size;
correcting the press mould once every 2000 blocks.
The pressure of the compression molding equipment is 60-90 MPa.
The temperature of the heat treatment is 50-280 ℃, and the temperature of the heat treatment is 3-6 h.
The chemical composition of the sealing layer comprises aluminum oxide (Al) 2 O 3 ) Silicon dioxide (SiO) 2 ) Iron oxide (Fe) 2 O 3 ) And ferrous oxide (FeO), the aluminum oxide (Al) 2 O 3 ) Is 37-41%, and the silicon dioxide (SiO) 2 ) Is 41-51%, and the iron oxide (Fe) 2 O 3 ) Is 0.66 to 0.75 percent, and the percentage of the ferrous oxide (FeO) is 1.24 to 2.96 percent.
The chemical composition of the pressure transfer layer comprises silicon dioxide (SiO) 2 ) Magnesium oxide (MgO), calcium oxide (CaO) and magnesium carbonate (MgCO) 3 ) Said silicon dioxide (SiO) 2 ) Is 3.5-4.5%, and the ratio of magnesium oxide (MgO) is 20-25%, respectivelyThe content of calcium oxide (CaO) is 25-30%, and the content of magnesium carbonate (MgCO) is 25-30% 3 ) The proportion of (A) is 10-15%.
The synthetic mechanism of artificial diamond is summarized mainly by several kinds of 'solid phase transformation theory', 'catalyst theory' and 'supersaturation-solvent theory', and the commonly accepted view is 'supersaturation-solvent theory', i.e. graphite is firstly dissolved in molten catalyst, then C atoms are separated out, in the course of diamond nucleation and growth, graphite and catalyst are mutually used as solvent and mutually used as solute, graphite firstly makes molten catalyst permeate into it, then C atoms on graphite carbon source are continuously diffused into the melting medium, after the synthetic temperature and pressure reach a certain value, C atoms are separated out from the melting medium under the condition of supercooling, because the atomic structure of the catalyst is close to that of diamond, in particular, it has the ability of attracting electrons, so that the separated C atoms form bonds in face-centered cubic structure, in the course of diamond growth, the melting medium and supersaturation-state C atoms are uniformly distributed around the diamond crystal nucleus, and C atoms are separated out from the melting medium to form a new phase: a diamond crystal nucleus, wherein the process has a thermodynamic process and a kinetic process;
the formation of any new phase comprises two stages with completely different properties, one is the formation of crystal nucleus and one is the growth of crystal nucleus, any property of the system in a specified state must have one and only one fixed value, and the process of the system reaching the state is not related, in the process of transforming graphite into diamond, the exception is not excluded, the state of the crystal nucleus just formed and the state of the crystal nucleus which can stably exist and grow after the formation are considered, when the temperature is T, the carbon atom with the pressure P forms a diamond crystal nucleus and can stably exist and grow, the radius of the crystal nucleus is r, the density of the crystal nucleus is mole per unit volume, and the single crystal nucleus is as follows:
The change in the enthalpy of emergence of the nuclear body is then:
wherein, in the formula: mu.s 1 Chemical potential of diamond nucleus;
μ 0 the chemical potential of carbon atoms when reaching a supersaturation state, namely the chemical potential of an equilibrium state, is the initial state of diamond nucleation;
Δ μ is the difference between the chemical potentials of diamond crystal nucleus and carbon atom;
Δ H herein Model (III) Is that the surface effect is not taken into account,
the change in enthalpy of self-extraction when a molar carbon atom crystallizes, in fact, also increases the enthalpy of surface self-extraction when a nucleus of radius r is formed:
ΔH long and long ＝4πr 2 σ
Wherein, in the formula: σ is the surface tension of the diamond article, so the change in total enthalpy of self-extraction when a fret is formed is:
wherein the content of the first and second substances,
Δ μ ＝μ 1 -μ 0 ＝-RTIn(P 1 /P 0 )
in the formula: r is Boltzmann constant;
t is the absolute temperature;
P 1 the pressure required by the stable existence of the diamond crystal nucleus in the carbon phase at the temperature T;
P 0 the pressure at which the system reaches chemical equilibrium;
from raoult's law it can be deduced that: a ═ P 1 /P 0 And a is the degree of supersaturation of the carbon phase at a pressure P and a temperature T, P 1 /P 0 Substitution of Δ μ ＝μ 1 -μ 0 ＝-RTIn(P 1 /P 0 ) The formula is as follows:
Δ μ ＝RTIna
now come to seek
Extreme values of the formula:
order to
Obtaining by solution: r is 1 0 (impractical, left off),
when:
when the temperature of the water is higher than the set temperature,
Δ H has a maximum value:
1. when a.ltoreq.1, i.e. the carbon atoms are unsaturated, Δ μ Δ H is greater than or equal to 0, then Δ H is greater than or equal to 0, thus, Δ H>0 and rises with the rise of r, which indicates that the concentration of carbon atoms in the system is not saturated, and diamond grains of any size are difficult to stably exist;
2. when the carbon atoms in the system reach a supersaturated state, namely a is more than or equal to 1, and delta mu is less than or equal to 0, then delta H max Less than or equal to 0, and in the course of increasing supersaturation, the change of delta H along with r is passed through a maximum value
And (3) deducing:
when the supersaturation degree reaches a certain value (and a certain supercooling degree exists), the supersaturated carbon atoms enter the radius r>r c When the crystal nuclei are enlarged,
the volume term in the formula is dominant, so that the self-enthalpy of the system, namely deltaH, is reduced, and therefore, the seed core can stably exist and can continuously grow into diamond;
② when the degree of supersaturation does not reach a certain value, the supersaturated carbon atoms enter r<rc, which is slightly longer,
the table entries in the formula are dominant, so that the self-enthalpy of the system is increased, and the crystal nucleus is automatically reduced immediately to disappear;
thus, r c The "critical radius" referred to as nucleation;
from the above discussion, it is known that the "critical radius" is related to a, which is inversely proportional to the temperature T and directly proportional to the pressure P, which is why the diamond is too much and fine during the diamond synthesis, and from the analysis of the nucleation mechanism of diamond, it is reasonable to use two times of pressure increase in the synthesis process in recent years, that is, at a certain pressure point in the graphite stable region, heating at constant pressure for about 20s, so that the supersaturation degree of carbon in the system is reduced, the nucleation number is reduced, carbon atoms are fully diffused, and the carbon source is increased, so as to meet the requirement of diamond growth, and thus, the diamond can be coarse and defect-free, and the purpose of producing high-quality and coarse-grained diamond is achieved.
Claims (9)
1. A novel synthetic diamond is with sealing material suppression device which characterized in that includes:
the sealing material pressing equipment comprises a novel pressing mold frame.
2. A novel pressing process of a sealing material for synthesizing diamond is characterized in that: comprises raw materials, equipment and the novel pressing mold frame as claimed in any one of claim 1;
s1, raw materials and equipment:
(1) raw materials: pyrophyllite, dolomite and a forming agent (sodium silicate);
(2) an apparatus: the device comprises a mixer, a press forming device and a firing device;
s2, step:
(1) proportionally adding pyrophyllite and a forming agent into a mixer for mixing and stirring, wherein the stirring time is 50min, and after the completion, storing for 24h for later use so as to form a sealing layer;
(2) putting dolomite and a forming agent into a mixer in proportion, mixing and stirring for 50min, and storing for 24h for later use after the completion of stirring so as to form a pressure transfer layer;
(3) bonding the sealing layer and the pressure transfer layer by using a forming agent;
(4) placing the bonded article into a compression molding device, and pressing to form a novel compression mold frame;
(5) and placing the formed novel bottom sealing block and the novel pressing mold frame into firing equipment for heat treatment so as to obtain a finished novel pressing mold frame.
3. The novel sealing material pressing process for synthetic diamond according to claim 1, wherein: the pyrophyllite comprises a coarse material, a medium material and a fine material, wherein the granularity of the coarse material is 120 meshes, the content of the coarse material is 30 +/-1%, the granularity of the medium material is 170 meshes, the granularity of the medium material is 50 +/-1%, the granularity of the fine material is 200 meshes, and the content of the fine material is 20 +/-1%.
4. The novel sealing material pressing process for synthetic diamond according to claim 1, wherein: the dolomite comprises coarse materials and fine materials, wherein the granularity of the coarse materials is 120 meshes, the content of the coarse materials is 80 +/-1%, the granularity of the fine materials is 150 meshes, and the content of the fine materials is 20 +/-1%.
5. The novel sealing material pressing process for synthetic diamond according to claim 1, wherein: the use requirements of the press forming equipment comprise the following steps:
righting a pressing die on the pressing forming equipment without deviating from the central position of a potential plate of the pressing machine;
adjusting a pressure gauge to indicate pressure, and when pressurizing, properly positioning the pressure to ensure the molding size;
correcting the press mould once every 2000 blocks.
6. The novel sealing material pressing process for synthetic diamond according to claim 1, wherein: the pressure of the compression molding equipment is 60-90 MPa.
7. The novel sealing material pressing apparatus and process for synthetic diamond according to claim 1, wherein: the temperature of the heat treatment is 50-280 ℃, and the temperature of the heat treatment is 3-6 h.
8. The novel sealing material pressing process for synthetic diamond according to claim 1, wherein: the chemical composition of the sealing layer comprises aluminum oxide (Al) 2 O 3 ) Silicon dioxide (SiO) 2 ) Iron oxide (Fe) 2 O 3 ) And ferrous oxide (FeO), the aluminum oxide (Al) 2 O 3 ) Is 37-41%, and the silicon dioxide (SiO) 2 ) Is 41-51%, and the iron oxide (Fe) 2 O 3 ) Is 0.66 to 0.75 percent, and the percentage of the ferrous oxide (FeO) is 1.24 to 2.96 percent.
9. The novel sealing material pressing process for synthetic diamond according to claim 1, wherein: the chemical composition of the pressure transfer layer comprises silicon dioxide (SiO) 2 ) Magnesium oxide (MgO), calcium oxide (CaO) and magnesium carbonate (MgCO) 3 ) Said silicon dioxide (SiO) 2 ) 3.5-4.5%, the ratio of magnesium oxide (MgO) is 20-25%, the ratio of calcium oxide (CaO) is 25-30%, and magnesium carbonate (magnesium carbonate) (magnesium oxide) (MgCO 3 ) The proportion of (A) is 10-15%.
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|---|---|---|---|---|
| GB897357A (en) * | 1960-05-16 | 1962-05-23 | Kaiser Aluminium Chem Corp | Improvements in or relating to furnace linings and products therefor |
| US6346689B1 (en) * | 1997-11-14 | 2002-02-12 | The Australian National University | Cell and method for forming a composite hard material and composite hard materials formed thereby |
| CN1765738A (en) * | 2004-10-29 | 2006-05-03 | 郑州人造金刚石及制品工程技术研究中心 | Medium material for diamond synthesis and medium constituted therefrom |
| CN202270507U (en) * | 2011-10-13 | 2012-06-13 | 上海琦实超硬材料有限公司 | Dolomite composite pyrophyllite lump |
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| CN109966994A (en) * | 2019-04-26 | 2019-07-05 | 河南省力量钻石股份有限公司 | A kind of diamond synthesizing compound block for transmitting pressure and preparation method thereof |
| CN215139661U (en) * | 2021-05-11 | 2021-12-14 | 洛阳润宝人造金刚石有限公司 | Sealing material pressing device for synthetic diamond |
-
2022
- 2022-03-30 CN CN202210333967.6A patent/CN114888926A/en active Pending
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| GB897357A (en) * | 1960-05-16 | 1962-05-23 | Kaiser Aluminium Chem Corp | Improvements in or relating to furnace linings and products therefor |
| US6346689B1 (en) * | 1997-11-14 | 2002-02-12 | The Australian National University | Cell and method for forming a composite hard material and composite hard materials formed thereby |
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| CN202270507U (en) * | 2011-10-13 | 2012-06-13 | 上海琦实超硬材料有限公司 | Dolomite composite pyrophyllite lump |
| CN206622076U (en) * | 2017-03-03 | 2017-11-10 | 上海昌润极锐超硬材料有限公司 | A kind of artificial diamond synthetic block |
| CN109966994A (en) * | 2019-04-26 | 2019-07-05 | 河南省力量钻石股份有限公司 | A kind of diamond synthesizing compound block for transmitting pressure and preparation method thereof |
| CN215139661U (en) * | 2021-05-11 | 2021-12-14 | 洛阳润宝人造金刚石有限公司 | Sealing material pressing device for synthetic diamond |
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| Title |
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| 杨炳飞等: "叶蜡石在高压合成中作为密封传压介质的应用研究", 《矿产综合利用》, pages 35 - 39 * |
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