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CN-121974668-A - Isostatic pressing ceramic tube shell and preparation method thereof

CN121974668ACN 121974668 ACN121974668 ACN 121974668ACN-121974668-A

Abstract

The invention discloses an isostatic pressing ceramic tube shell, which comprises a ceramic body and a metal tube shell which is matched with the ceramic body for use, wherein the ceramic body is formed by sintering a dry base formed by powder and a forming auxiliary agent after the blank is manufactured, the forming auxiliary agent accounts for less than 8% of the dry base in weight proportion during the blank manufacturing, the dry base comprises 5% -15% of CaO, 3% -10% of MgO, 20% -35% of AL 2 O 3 % of 35% of SiO 2 and 40% -60% of SiO 2 in weight proportion, and the ceramic body does not contain the forming auxiliary agent after the sintering. The preparation method comprises the steps of ceramic body blank preparation, blank shape treatment, blank sintering, surface treatment and shaping treatment, and finally, detecting and warehousing an isostatic pressing ceramic tube shell finished product. The invention adopts quaternary system formula (CaO, mgO, AL 2 O 3 ,SiO 2 ), has good performance index, and the core of the isostatic pressing ceramic tube shell is a calcium-magnesium-aluminum-silicon ceramic system, which is suitable for matching and sealing with a metal tube shell. Compared with the traditional ternary system formula, the invention has the characteristics of low dielectric loss, large volume resistance, large bending strength, strong acid resistance and the like.

Inventors

  • Zheng Sihong

Assignees

  • 厦门市海鼎盛科技有限公司

Dates

Publication Date
20260505
Application Date
20251231

Claims (9)

  1. 1. The isostatic ceramic tube shell is characterized by comprising a ceramic body and a metal tube shell which is matched with the ceramic body for use, wherein the ceramic body is formed by sintering a dry base formed by powder and a forming auxiliary agent after being made into a blank, the forming auxiliary agent accounts for less than 8% of the dry base in weight ratio during blank making, the dry base comprises 5% -15% of CaO, 3% -10% of MgO, 20% -35% of AL 2 O 3 and 40% -60% of SiO 2 in weight ratio, and the ceramic body does not contain the forming auxiliary agent after sintering.
  2. 2. An isostatic ceramic package as claimed in claim 1, wherein said water is 10% by weight on a dry basis and the ceramic body is composed of 10% by weight CaO, 10% by weight MgO, 30% by weight AL 2 O 3 and 50% by weight SiO 2 .
  3. 3. The isostatic ceramic package as recited in claim 1, wherein said forming aid is one of deionized water or tap water.
  4. 4. An isostatic ceramic package as claimed in claim 1, wherein said ceramic body and said metal package are welded.
  5. 5. A method for producing a ceramic envelope as claimed in any one of claims 1 to 4, characterized by comprising the steps of: S1, preparing a ceramic body blank, namely mixing CaO, mgO, AL 2 O 3 and SiO 2 in the proportion to obtain a dry base, mixing the dry base and a forming additive in the proportion to form plastic powder, and carrying out isostatic pressing on the plastic powder to obtain the blank; S2, performing blank shape processing, namely cutting the blank obtained in the step S1 according to preset requirements; S3, sintering the blank, namely placing the blank obtained in the step S2 into a sintering furnace, and after sintering, adopting vibration polishing, grinding, cleaning and glaze spraying to obtain a ceramic body assembled with a metal tube shell; s4, surface treatment, namely welding the metal tube shell and the ceramic body, and then electroplating the welded metal tube shell and the ceramic body by adopting nickel sulfamate; and S5, shaping treatment, namely shaping the isostatic pressing ceramic tube shell electroplated in the step S4, obtaining the isostatic pressing ceramic tube shell after treatment, and warehousing after finished product detection.
  6. 6. The method of claim 5, wherein in step S1, caO, mgO, AL 2 O 3 and SiO 2 are respectively ground in a grinder to obtain powder having a powder size D50 of 1-3 μm, caO, mgO, AL 2 O 3 and SiO 2 , and the powder is uniformly mixed to obtain the dry base.
  7. 7. The method of claim 5, wherein in step S1, the dry base and water are mixed in proportion and then mixed at a speed of 12000-40000 rpm to form plastic powder; the isostatic pressing is that plastic powder is filled into an elastic mould to be sealed and exhausted, then the mould is put into an isostatic pressing machine to be pressurized to 150-250MPa, and the pressure is maintained for 5-15min, and a blank body is obtained after pressure relief and demoulding.
  8. 8. The method for preparing a ceramic package according to claim 5, wherein step S6 is added between the step S3 and the step S2, and the blank is pretreated: the embryo pretreatment is that the embryo is subjected to gradient drying treatment, and the embryo with the water content lower than 0.5% is obtained; The gradient drying treatment is that the drying temperature is changed from room temperature to 60 ℃ and then 120 ℃ and the drying time is 12-24h.
  9. 9. The method of claim 5, wherein in step S3, the sintering furnace is a push-in box type or tubular kiln, the temperature rising rate of the sintering furnace is 5-10 ℃ per minute, the sintering temperature is 1250-1400 ℃, the temperature is kept for 2-4 hours, and the sintering furnace is cooled to room temperature along with the furnace.

Description

Isostatic pressing ceramic tube shell and preparation method thereof Technical Field The invention relates to an isostatic pressing ceramic tube shell and a preparation method thereof, in particular to an isostatic pressing ceramic tube shell with high environmental protection coefficient, low expansion and high compactness and a preparation method thereof. Background At present, a plurality of manufacturers in China mainly use a hot-die-casting forming process, so that the uniformity of a blank structure is poor, the density is poor, the product quality is unstable, and more serious, the hot-die-casting forming process is required to have a wax removing process, and a large amount of harmful gas is generated in the wax removing process, so that the hot-die-casting forming process is extremely not environment-friendly and does not meet the national environment-friendly requirement. In view of the above, the present invention is needed to develop a ceramic package that overcomes the above problems. Disclosure of Invention The invention aims to solve the technical problem of providing an isostatic pressing ceramic tube shell and a preparation method thereof, and the isostatic pressing ceramic tube shell has the advantages of high environmental protection coefficient, low expansion and high compactness. In order to solve the technical problems, the technical scheme is that the isostatic pressing ceramic tube shell is characterized by comprising a ceramic body and a metal tube shell which is matched with the ceramic body, wherein the ceramic body is formed by sintering a dry basis formed by powder, the forming additive accounts for less than 8% of the dry basis in the process of embryo preparation, the dry basis comprises 5% -15% of CaO, 3% -10% of MgO, 20% -35% of AL 2O3 and 40% -60% of SiO 2, and the ceramic body does not contain the forming additive after sintering. Preferably, the water comprises 10% by weight of the dry basis, and the ceramic body is composed of 10% by weight of CaO, 10% by weight of MgO, 30% by weight of AL 2O3 and 50% by weight of SiO 2. Preferably, the forming aid is one of deionized water or tap water. Preferably, the ceramic body is welded to the metal shell. A preparation method of a ceramic tube shell is used for preparing the ceramic tube shell and comprises the following steps: S1, preparing a ceramic body blank, namely mixing CaO, mgO, AL 2O3 and SiO 2 in the proportion to obtain a dry base, mixing the dry base and a forming additive in the proportion to form plastic powder, and carrying out isostatic pressing on the plastic powder to obtain the blank; S2, performing blank shape processing, namely cutting the blank obtained in the step S1 according to preset requirements; S3, sintering the blank, namely placing the blank obtained in the step S2 into a sintering furnace, and after sintering, adopting vibration polishing, grinding, cleaning and glaze spraying to obtain a ceramic body assembled with a metal tube shell; s4, surface treatment, namely welding the metal tube shell and the ceramic body, and then electroplating the welded metal tube shell and the ceramic body by adopting nickel sulfamate; and S5, shaping treatment, namely shaping the isostatic pressing ceramic tube shell electroplated in the step S4, obtaining the isostatic pressing ceramic tube shell after treatment, and warehousing after finished product detection. Preferably, in the step S1, caO, mgO, AL 2O3 and SiO 2 are weighed and respectively put into a grinder to be ground, powder CaO, mgO, AL 2O3 and SiO 2 with the powder particle size D50 equal to 1-3 μm are obtained, and the dry basis is obtained by uniformly mixing. Preferably, in the step S1, after mixing dry base and water according to a proportion, mixing at a speed of 12000-40000 r/min to form plastic powder; the isostatic pressing is that plastic powder is filled into an elastic mould to be sealed and exhausted, then the mould is put into an isostatic pressing machine to be pressurized to 150-250MPa, and the pressure is maintained for 5-15min, and a blank body is obtained after pressure relief and demoulding. Preferably, step S6 is added between the step S3 and the step S2, and the embryo body is preprocessed: the embryo pretreatment is that the embryo is subjected to gradient drying treatment, and the embryo with the water content lower than 0.5% is obtained; The gradient drying treatment is that the drying temperature is changed from room temperature to 60 ℃ and then 120 ℃ and the drying time is 12-24h. Preferably, in the step S3, the sintering furnace is a push-in box type or tubular kiln, the temperature rising rate of the sintering furnace is 5-10 ℃ per minute, the sintering temperature is 1250-1400 ℃, the temperature is kept for 2-4 hours, and the sintering furnace is cooled to room temperature along with the furnace. The invention has the advantages that the invention adopts quaternary system formula (CaO, mgO, AL 2O3,SiO2), the performance index i