CN101423877B - Non-metal drill bit for tap hole of blast furnace and method for producing the same - Google Patents
Non-metal drill bit for tap hole of blast furnace and method for producing the same Download PDFInfo
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Abstract
The invention relates to a nonmetallic drill bit for blast-furnace taphole drilling machine, as well as a manufacturing method thereof. The structure form of the drill bit is an integral drill bit or an inlaid-type drill bit; the integral drill bit is made of an inorganic nonmetallic material; an inlaid-type drill bit body adopts metallic materials; the head of the inlaid-type drill bit body is made of the inorganic nonmetallic material; and the components in weight percentage of the inorganic nonmetallic material are as follows: 60 to 85 percent of silicon carbide fine powder, 5 to 38 percent of silicon carbide micropowder, 0 to 20 percent of nonmetallic nitride micropowder, 0 to 20 percent of metallic silicon powder and 2 to 12 percent of admixture. As the nonmetallic drill bit has high strength at both a normal temperature and a high temperature, and has the service temperature up to 1,500 DEG C, the nonmetallic drill bit is superior in wear resistance, can easily open blast-furnace blast iron notches plugged with hard stemming, can completely ensure that the one-time taphole drilling ratio of the blast-furnace blast iron notches reaches 100 percent, shortens iron notch opening time, can be repeatedly used, has long life span, reduces the labor intensity of workers, and improves labor efficiency.
Description
Technical field
The present invention relates to tap hole of blast furnace drill bit and manufacture method thereof.Particularly a kind of non-metal drill bit for tap hole of blast furnace and manufacture method thereof.
Background technology
Beat one of equipment of tapping outlet indispensability when tap hole of blast furnace is blast furnace casting, and drill bit is the vitals of taphole drilling machine.Present opening machine bit is inserted, and promptly body adopts metallic substance, Hardmetal materials such as head damascene tungsten chromium, tungsten cobalt.Consult relevant patent documentation, more about blast furnace taphole taphole drilling machine drill bit patent disclosure report, as: open (bulletin) number is CN1704481, is called " blast furnace open hole drill bit and manufacture method thereof "; Open (bulletin) number is CN2931490, is called on " blast furnace open hole drill bit "; Open (bulletin) number is CN201082889, name is called the patent publication us of " iron-smelting blast furnace tapping and plugging machine drill bit ", more than the common feature of Bao Dao technical scheme is the insert bit that adopts Hardmetal materials, improves the tap hole of blast furnace drill bit by shape, the structure of optimizing drill bit.But all have following shortcoming when reality is used: low, easy wearing and tearing in (1) work-ing life, labor strength is big.800 ℃ of the inserted drill use temperature limit, temperature raises when drill bit is neighbouring near " red point (1000 ℃) ", and drill bit is softening, intensity sharply descends, serious wear, and fltting speed obviously descends,＞2000m
3The common tapping outlet of large blast furnace need consume 3～5 drill bits, and need manually more bit change, prolonged the tapping outlet time, cause the furnace pressure stewing stove phenomenon that raises easily, efficiency is lower, has increased drill bit consumption.(2) can't bore out the iron mouth that stops up with the hard stemming.The hard stemming has that big, the anti-molten iron scouring capability of hot strength is strong, iron influx is big and guarantee advantage such as smooth operation of furnace, but because all inserted drills on the market can't bore out at all, thereby the hard stemming fails generally to use at blast furnace iron notch.Not having at present preferably, technical measures solve this technical barrier of iron mouth of opening with the obstruction of hard stemming, can only open hard stemming iron mouth with the way of oxygen rifle burning eye, but it is excessive that the oxygen rifle burns the iron oral pore of an opening footpath, the aperture irregularity, the tapping outlet time is long, refractory consumption rate increases, and has increased the danger coefficient of operating process, is unfavorable for that the workman operates.
Summary of the invention
The invention provides a kind of non-metal drill bit for tap hole of blast furnace and manufacture method thereof, prolong drilling life of bit, and can open hard stemming iron notch.
The structure formation of non-metal drill bit for tap hole of blast furnace provided by the invention is solid drill or insert bit, it is characterized in that: integral (drill) bit adopts ceramic to make, the insert bit body adopts metallic substance, adopt ceramic to make at head, each weight percentages of components of described ceramic is as follows:
Carbide fine powder 60～85%
Silicon carbide micro-powder 5～38%
Non-metal nitride micro mist 0～20%
Metallic silicon power 0～20%
Admixture 2～12%
Wherein said carbide fine powder SiC content 〉=98%, granularity＜0.044mm;
Wherein said silicon carbide micro-powder SiC content 〉=98%, granularity＜4 μ m;
Wherein said non-metal nitride micro mist comprises: silicon nitride, titanium nitride, aluminium nitride, boron nitride, non-metal nitride content 〉=98%, granularity＜4 μ m;
Wherein said metallic silicon power Si content 〉=99%, granularity＜4 μ m;
Wherein said admixture comprises: the wedding agent that uses when adopting injection forming and isostatic pressing, wedding agent is one or both of carboxymethyl cellulose and polyvinyl alcohol, the ratio of carboxymethyl cellulose and polyvinyl alcohol is 1: 1.5 during with two kinds, and the effect of wedding agent is to guarantee that having certain intensity after the goods oven dry is beneficial to carrying; The dispersion agent poly amic acid, organic monomer analytical pure Methacrylamide, linking agent analytical pure methylene-bisacrylamide, initiator analytical pure ammonium persulphate and the pure N of catalyst analysis that use when adopting gel casting forming, N, N ', N '-Tetramethyl Ethylene Diamine, the add-on of above admixture is 3: 6: 1.5 in the ratio of said sequence: 0.018: 0.09.
The manufacture method of non-metal drill bit for tap hole of blast furnace provided by the invention comprises the following steps:
A. batching mixes various ceramic by the said components prescription;
B. blank slip preparation is put into ball mill with mixed raw materials and the admixture for preparing, and adds the deionized water of compound gross weight 30～50%, wet ball grinding 0.5～24 hour, both the blank slip for preparing;
C. injection forming or isostatic pressing or gel casting forming are adopted in moulding;
Injection forming: slip is poured in the ready plaster mold, constantly replenished slip, solidify fully, solidify back band mould seasoning 8～12 hours until last slip along with moisture in the slip is blotted by gypsum mold;
Isostatic pressing: the slip behind the ball milling is manufactured the particle of water content 5% with sponging granulator, and in the rubber coating of packing into, sealing is placed in the isostatic pressing machine in 200～250MPa compacted under, 30～60 minutes dwell times;
Gel casting forming: by above-mentioned ceramic and dispersion agent, organic monomer, the linking agent proportioning is mixed, deionized water with mixed raw materials adding 30～50%, put into ball mill, mix 30～60min, prepare the concentrated suspension slip of the high solid volume fraction of low viscosity, pour slip into container, place vacuum drying oven to carry out vacuum outgas, in slip, add initiator analytical pure ammonium persulphate and the pure N of catalyst analysis after the vacuum outgas in proportion, N, N ', N '-Tetramethyl Ethylene Diamine is before being poured into after the stirring in the ready mould, at linking agent, under the acting in conjunction of initiator and catalyzer, the be cross-linked with each other superpolymer of tridimensional network of formation makes concentrated suspension form gel and consolidation in-situ forming;
D. oven dry, to solidify back slip band mould and put into baking oven rises to 50～110 ℃ of oven dry eliminating in 10～24 hours slip with 5～10 ℃/min heat-up rate 60～80% moisture, base substrate gets final product the demoulding after having intensity, continues at residual water-content in 110 ℃ of oven dry base substrates after the demoulding;
E. burn till, the base substrate after the oven dry is placed the Medium frequency induction sintering oven, insulation was burnt till in 5～10 hours under 1400～2500 ℃ of argon gas or nitrogen protection, took out behind the naturally cooling;
F. machinery or underhand polish shaping are adopted in shaping;
G. inlay, adopt ordinary method that the ceramic head is embedded on the metallic substance body, make insert bit, make integral (drill) bit and omit this step.
Non-metal drill bit for tap hole of blast furnace provided by the invention and manufacture method thereof are compared with existing similar technology, and its significant beneficial effect is embodied in:
Non-metal drill bit for tap hole of blast furnace all has very high intensity under normal temperature and high temperature, use temperature is up to 1500 ℃, therefore abrasion resistance is very superior, can easily open the blast furnace taphole that adopts the hard stemming stifled, can guarantee that fully an aperture opening ratio of blast furnace taphole reaches 100%, shorten the tapping outlet time, reusable, long service life alleviates labor strength, raises labour efficiency; Make the ceramic wide material sources of drill bit, manufacture method adopts common process and equipment.
Embodiment
Embodiment 1
The non-metal drill bit for tap hole of blast furnace structure formation that present embodiment provided is insert bit, and forming method is an injection forming, and admixture is a wedding agent.The insert bit body adopts metallic substance, adopts ceramic to make at head, and each weight percentages of components of described ceramic is as follows:
Carbide fine powder 65～75%
Silicon carbide micro-powder 25～35%
Wedding agent 2～5%
Wherein said carbide fine powder SiC content 〉=98%, granularity＜0.044mm, preferred add-on is 70%;
Wherein said silicon carbide micro-powder SiC content 〉=98%, granularity＜4 μ m, preferred add-on is 30%;
Wherein said wedding agent is carboxymethyl cellulose and polyvinyl alcohol, is called for short CMC and PVA respectively, and normal temperature is pressed powder down, and preferred add-on is respectively CMC 2%, and PVA 3%.
The manufacture method of the non-metal drill bit for tap hole of blast furnace that present embodiment provided is:
According to above-mentioned each component prescription batching; add 30～50% deionized water then; going into the ball mill wet ball grinding 24 hours both was the slip for preparing; pour slip in the ready plaster mold two-sided grouting method moulding of employing; along with being blotted by gypsum mold, moisture in the slip constantly replenishes slip; solidify fully until last slip; solidify the band mould seasoning of back, back after 10 hours; go into baking oven and rise to 60% moisture that 110 ℃ of oven dry were got rid of in the slip in 24 hours with 5 ℃/min heat-up rate; base substrate gets final product the demoulding after having intensity; continue at residual water-content in 110 ℃ of oven dry base substrates after the demoulding; base substrate after the oven dry is placed the Medium frequency induction sintering oven; burn till under the insulation argon shield in 8 hours down in 2500 ℃; take out behind the naturally cooling, through grinding shaping; inlay and to produce inserted recrystallized silicon carbide matter non-metal drill bit for tap hole of blast furnace.Its performance index such as following table:
| Test item | Detected result |
| SiC，wt％ | 98.8 |
| Volume density, g/cm 3 | 2.71 |
| Apparent porosity, % | 14.4 |
| 20 ℃ of strength at normal temperature, MPa | 102 |
| 1400 ℃ of strength at normal temperature, MPa | 116 |
| Thermal expansivity ℃ -1，20～1200℃ | 4.3×10 -6 |
| Thermal conductivity, W/M -1K -11200℃ | 20.8 |
| Maximum operation (service) temperature, ℃ | 1500 |
Embodiment 2
The non-metal drill bit for tap hole of blast furnace structure formation that present embodiment provided is insert bit, and forming method is an isostatic pressing, and admixture is a wedding agent.The insert bit body adopts metallic substance, adopts ceramic to make at head, and each weight percentages of components of described ceramic is as follows:
Carbide fine powder 60～80%
Silicon carbide micro-powder 10～20%
Metallic silicon power 10～20%
Wedding agent 2～5%
Wherein said carbide fine powder SiC content 〉=98%, granularity＜0.044mm, preferred add-on is 70%;
Wherein said silicon carbide micro-powder SiC content 〉=98%, granularity＜4 μ m, preferred add-on is 15%;
Wherein said metallic silicon power Si content 〉=99%, granularity＜4 μ m forms silicon nitride bonded silicon mutually with the nitrogen reaction when burning till, and preferred add-on is 15%;
Wherein said wedding agent is carboxymethyl cellulose and polyvinyl alcohol, is called for short CMC and PVA respectively, and normal temperature is pressed powder down, and preferred add-on is respectively CMC 2%, and PVA 3%.
The manufacture method of the non-metal drill bit for tap hole of blast furnace that present embodiment provided is:
According to above-mentioned each component prescription batching; add 30～50% deionized water then; going into the ball mill ball milling 24 hours both was the slip for preparing; adopt sponging granulator to carry out granulation slip; the false particle that forms after the granulation; granularity is less than 0.5mm; moisture 5%; this material pack into isostatic pressing with in the rubber mold; behind the sealed mold; place isostatic pressing machine in the 250MPa compacted under, in 110 ℃ of oven dry 24 hours, the base substrate after the oven dry is placed high-temperature electric resistance furnace after the demoulding; feed nitrogen; insulation was burnt till in 6 hours under 5 ℃/min was warming up to 1400 ℃, took out behind the naturally cooling, through grinding shaping; inlay and to produce inserted reaction sintering silicon nitride based on silicon carbide matter non-metal drill bit for tap hole of blast furnace.Its performance index such as following table:
| Test event | Measurement result |
| SiC，wt％ | 78 |
| Si 3N 4，wt％ | 22 |
| Volume density, g/cm 3 | 2.79 |
| Apparent porosity, % | 13.5 |
| 20 ℃ of strength at normal temperature, MPa | 175 |
| 1400 ℃ of strength at normal temperature, MPa | 180 |
| Young's modulus, GPa | 273 |
| Thermal expansivity ℃ -1，20～1200℃ | 4.6×10 -6 |
| Thermal conductivity, W/M -1K -1，1200℃ | 19.5 |
| Test event | Measurement result |
| Maximum operation (service) temperature, ℃ | 1500 |
Embodiment 3
The non-metal drill bit for tap hole of blast furnace structure formation that present embodiment provided is insert bit, and forming method is an isostatic pressing, and admixture is a wedding agent.The insert bit body adopts metallic substance, adopts ceramic to make at head, and each weight percentages of components of described ceramic is as follows:
Carbide fine powder 60～70%
Silicon carbide micro-powder 10～20%
Silicon nitride powder 5～10%
Metallic silicon power 5～10%
Wedding agent 2～5%
Wherein said carbide fine powder SiC content 〉=98%, granularity＜0.044mm, preferred add-on is 67%;
Wherein said silicon carbide micro-powder SiC content 〉=98%, granularity＜4 μ m, preferred add-on is 15%;
Wherein said silicon nitride powder Si3N4 content 〉=98%, granularity＜4 μ m is introduced as crystal seed, helps the formation of silicon nitride bonded silicon phase, and preferred add-on is 10%;
Wherein said metallic silicon power Si content 〉=99%, granularity＜4 μ m forms silicon nitride bonded silicon mutually with the nitrogen reaction when burning till, and preferred add-on is 8%;
Wherein said wedding agent is carboxymethyl cellulose and polyvinyl alcohol, is called for short CMC and PVA respectively, and normal temperature is pressed powder down, and preferred add-on is respectively CMC 2%, PVA 3%.
The manufacture method of the non-metal drill bit for tap hole of blast furnace that present embodiment provided is:
According to above-mentioned each component prescription batching, add 30～50% deionized water then, going into the ball mill ball milling was the slip for preparing both in 24 hours, adopted sponging granulator to carry out granulation slip, the false particle that forms after the granulation, granularity is less than 0.5mm, moisture 5% is packed this material into isostatic pressing with in the rubber mold, behind the sealed mold, place isostatic pressing machine in the 250MPa compacted under, dried 24 hours in 110 ℃ after the demoulding; Base substrate after the oven dry is placed high-temperature electric resistance furnace, feed nitrogen, 5 ℃/min be warming up to 1400 ℃ down insulation burnt till in 6 hours, take out behind the naturally cooling, through grinding shaping, inlaying and can produce inserted reaction sintering silicon nitride based on silicon carbide matter non-metal drill bit for tap hole of blast furnace.Its performance index such as following table.
| Test event | Measurement result |
| SiC，wt％ | 77 |
| Si 3N 4，wt％ | 23 |
| Volume density, g/cm 3 | 2.80 |
| Apparent porosity, % | 12.6 |
| Test event | Measurement result |
| 20 ℃ of strength at normal temperature, MPa | 178 |
| 1400 ℃ of strength at normal temperature, MPa | 182 |
| Young's modulus, GPa | 275 |
| Thermal expansivity ℃ -1，20～1200℃ | 4.6×10 -6 |
| Thermal conductivity, W/M -1K -1，1200℃ | 19.6 |
| Maximum operation (service) temperature, ℃ | 1500 |
Embodiment 4
The non-metal drill bit for tap hole of blast furnace structure formation that present embodiment provided is for being integral (drill) bit, and forming method is a gel injection.Integral (drill) bit all adopts ceramic to make, and each weight percentages of components of described ceramic is as follows:
Carbide fine powder 65～75%
Silicon carbide micro-powder 25～35%
Admixture 10.608%
Wherein said carbide fine powder SiC content 〉=98%, granularity＜0.044mm, preferred add-on is 70%;
Wherein said silicon carbide micro-powder SiC content 〉=98%, granularity＜4 μ m, preferred add-on is 30%;
Wherein said admixture is: dispersion agent poly amic acid, add-on are 3% of gross weight, the monomer Methacrylamide, add-on is 6% of a gross weight, linking agent methylene-bisacrylamide, add-on are 1.5% of gross weight, catalyst n, N, N ', N '-Tetramethyl Ethylene Diamine, add-on is 0.018% of a gross weight, initiator ammonium persulfate, add-on are 0.09% of gross weight.
The manufacture method of the non-metal drill bit for tap hole of blast furnace that present embodiment provided is:
According to above-mentioned each component prescription batching, earlier ceramic, dispersion agent, organic monomer, linking agent are mixed, add 30～50% deionized water then, put into ball mill, mix 40min; Pour the slip that mixes into beaker, place vacuum drying oven to carry out vacuum outgas, in slip, add catalyzer and initiator after the vacuum outgas in proportion, stir at a slow speed be poured into behind the 3min before in the ready mould, under argon shield, rise to the most of moisture that 50 ℃ of oven dry were got rid of in the slip in 24 hours with 5 ℃/min heat-up rate; Treat to get final product the demoulding after base substrate has certain intensity, be warming up to 110 ℃ of oven dry with 7 ℃/min after the demoulding and got rid of residual water-content in the base substrate in 24 hours; Base substrate after the oven dry is placed the Medium frequency induction sintering oven; burn till under the insulation argon shield in 10 hours down in 2500 ℃; behind the naturally cooling, can produce monoblock type recrystallized silicon carbide matter non-metal drill bit for tap hole of blast furnace, its performance index such as following table through grinding shaping:
| Test item | Detected result |
| SiC，wt％ | 98.6 |
| Volume density, g/cm 3 | 2.72 |
| Apparent porosity, % | 12.2 |
| 20 ℃ of strength at normal temperature, MPa | 113 |
| 1400 ℃ of strength at normal temperature, MPa | 125 |
| Thermal expansivity ℃ -1，20～1200℃ | 4.4×10 -6 |
| Thermal conductivity, W/M -1K -11200℃ | 19.6 |
| Maximum operation (service) temperature, ℃ | 1500 |
| SiC，wt％ | 98.8 |
| Volume density, g/cm 3 | 2.71 |
| Apparent porosity, % | 14.4 |
| 20 ℃ of strength at normal temperature, MPa | 102 |
| 1400 ℃ of strength at normal temperature, MPa | 116 |
Claims (4)
1. non-metal drill bit for tap hole of blast furnace, its structure formation is solid drill or insert bit, it is characterized in that: integral (drill) bit adopts ceramic to make, the insert bit body adopts metallic substance, adopt ceramic to make at head, each weight percentages of components of described ceramic is as follows:
Carbide fine powder 60～85%
Silicon carbide micro-powder 5～38%
Silicon nitride powder 0～20%
Metallic silicon power 0～20%
Admixture 2～12%
Wherein said carbide fine powder SiC content 〉=98%, granularity＜0.044mm;
Wherein said silicon carbide micro-powder SiC content 〉=98%, granularity＜4 μ m;
Wherein said silicon nitride powder Si
3N
4Content 〉=98%, granularity＜4 μ m;
Wherein said metallic silicon power Si content 〉=99%, granularity＜4 μ m;
Wherein said admixture comprises: the wedding agent that uses when adopting injection forming and isostatic pressing, and wedding agent is one or both of carboxymethyl cellulose and polyvinyl alcohol, the ratio of carboxymethyl cellulose and polyvinyl alcohol is 1: 1.5 during with two kinds; The dispersion agent poly amic acid that uses when adopting gel casting forming, organic monomer analytical pure Methacrylamide, linking agent analytical pure methylene-bisacrylamide, initiator analytical pure ammonium persulphate, the pure N of catalyst analysis, N, N ', N '-Tetramethyl Ethylene Diamine, the add-on of above admixture is 3: 6: 1.5 in the ratio of said sequence: 0.018: 0.09.
2. the manufacture method of the described non-metal drill bit for tap hole of blast furnace of claim 1 is characterized in that this method comprises the following steps:
A. batching mixes various ceramic by the said components prescription;
B. blank slip preparation is put into ball mill with mixed raw materials and the admixture for preparing, and adds the deionized water of compound gross weight 30～50%, wet ball grinding 12～24 hours, both the blank slip for preparing;
C. injection forming is adopted in moulding, and slip is poured in the ready plaster mold, constantly replenishes slip along with moisture in the slip is blotted by gypsum mold, solidifies fully until last slip, solidifies back band mould seasoning 8～12 hours;
D. oven dry, to solidify back slip band mould and put into baking oven rises to 50～110 ℃ of oven dry eliminating in 10～24 hours slip with 5～10 ℃/min heat-up rate 60～80% moisture, base substrate gets final product the demoulding after having intensity, continues at residual water-content in 110 ℃ of oven dry base substrates after the demoulding;
E. burn till, the base substrate after the oven dry is placed the Medium frequency induction sintering oven, insulation was burnt till in 5～10 hours under 1400～2500 ℃ of argon gas or nitrogen protection, took out behind the naturally cooling;
F. machinery or underhand polish shaping are adopted in shaping;
G. inlay, adopt ordinary method that the ceramic head is embedded on the metallic substance body, make insert bit, make integral (drill) bit and omit this step.
3. the manufacture method of non-metal drill bit for tap hole of blast furnace according to claim 2; it is characterized in that the moulding employing isostatic pressing among this method steps c; its forming method is: the particle that the slip behind the ball milling is manufactured water content 5% with sponging granulator; pack in the rubber coating mask; it is interior in 200～250MPa compacted under that sealing is placed on isostatic pressing machine, 30～60 minutes dwell times.
4. the manufacture method of non-metal drill bit for tap hole of blast furnace according to claim 2, it is characterized in that the moulding employing gel casting forming among this method steps c, its forming method is: by ceramic that provides in the claim 1 and dispersion agent, organic monomer, the proportioning of linking agent is mixed, add 30～50% deionized water then, put into ball mill, mix 30～60min, prepare the concentrated suspension slip of the high solid volume fraction of low viscosity, pour slip into container, place vacuum drying oven to carry out vacuum outgas, in slip, add initiator analytical pure ammonium persulphate and the pure N of catalyst analysis after the vacuum outgas in proportion, N, N ', N '-Tetramethyl Ethylene Diamine is before being poured into after the stirring in the ready mould, at linking agent, under the acting in conjunction of initiator and catalyzer, the be cross-linked with each other superpolymer of tridimensional network of formation makes concentrated suspension form gel and consolidation in-situ forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810229107 CN101423877B (en) | 2008-11-28 | 2008-11-28 | Non-metal drill bit for tap hole of blast furnace and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810229107 CN101423877B (en) | 2008-11-28 | 2008-11-28 | Non-metal drill bit for tap hole of blast furnace and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101423877A CN101423877A (en) | 2009-05-06 |
| CN101423877B true CN101423877B (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810229107 Expired - Fee Related CN101423877B (en) | 2008-11-28 | 2008-11-28 | Non-metal drill bit for tap hole of blast furnace and method for producing the same |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102924085B (en) * | 2012-11-28 | 2014-10-29 | 武汉钢铁(集团)公司 | Silicon carbide ceramic blast furnace drill bit and method for manufacturing same |
| CN111499387A (en) * | 2020-04-22 | 2020-08-07 | 衡阳凯新特种材料科技有限公司 | High-strength silicon nitride composite silicon carbide ceramic and preparation method and application thereof |
| CN116730725A (en) * | 2023-06-05 | 2023-09-12 | 衡阳凯新特种材料科技有限公司 | Silicon nitride composite ceramic material for lift tube, preparation method and application |
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