A kind of degradable low-temperature co-fired ceramics and its preparation method
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A technology of low temperature co-fired ceramics and ceramics, applied in the field of electronic engineering applications, can solve problems such as environmental pollution
Active Publication Date: 2021-06-11
SOUTHWEST JIAOTONG UNIV
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[0004] The invention aims to solve the problem of environmental pollution in the recycling of waste electronic equipment. By providing a degradable low-temperature co-fired ceramic material and its preparation method, the waste electronic components can be degraded by themselves in the water environment, and precious metals can be extracted safely and environmentally friendly. In order to avoid the environmental pollution caused by the traditional strong acid and strong alkali corrosion process
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[0025] Such as figure 1 Shown, a kind of preparation method of above-mentioned degradable low-temperature co-fired ceramics, comprises the following steps:
[0026] S1, with SiO 2 , SiO 2 ·nH 2 O, H 3 BO 3 , B 2 o 3 , NaOH, KOH, Ba(OH) 2 ·8H 2 O, Al(OH) 3 , MgO, CaO, SrO, ZnO and rare earth oxides as raw materials, according to the composition of ceramics, weigh each raw material separately, and add distilled water according to the water-solid ratio of 3 to 5:1 to make a mixture, and set aside;
[0027] S2. Using a ball mill to mill the water-solid mixture in step S1, the milling time is 5 to 7 hours;
[0028] S3. After the treatment in step S2, the ceramic suspension slurry is separated, and dried at a temperature of 80-100° C. to a constant weight for 24-36 hours to obtain a dry sample;
[0029] S4, taking out the dry sample and crushing and grinding to obtain a powdery material with a particle size of 2-50 μm;
[0030] S5, placing the powdery material in a cruc...
Embodiment 1
[0034] A method for preparing the above-mentioned degradable low-temperature co-fired ceramics, comprising the following steps:
[0035] S1, with SiO 2 、H 3 BO 3 , Al(OH) 3 as raw material, according to xB 2 o 3 ·ySiO 2 · zAl 2 o 3 In wMO, x=23%, y=64%, z=13%, w=0% ratio, weigh each raw material separately, and add distilled water according to the water-solid ratio of 3-5:1 to make a mixture, set aside ;
[0036] S2. Use a ball mill to mill the water-solid mixture in step S1, and the milling time is 6 hours;
[0037] S3. After the treatment in step S2, the ceramic suspension slurry is separated, and dried at a temperature of 90° C. to a constant weight for 30 hours to obtain a dry sample;
[0038] S4, taking out the dry sample and crushing and grinding to obtain a powdery material with a particle size of 2-50 μm;
[0039] S5, placing the powdery material in a crucible, and calcining at a temperature of 300° C. for 5 hours to obtain a pre-calcined sample;
[0040] S6,...
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Abstract
The invention discloses a degradable low-temperature co-fired ceramic, which is a ceramic material mainly composed of borosilicate inorganic polymer molecular structure, and its composition chemical formula is xB 2 o 3 ·ySiO 2 · zAl 2 o 3 ·wMO, where MO is MgO, CaO, SrO, BaO, Na 2 O, Al 2 o 3 、K 2 At least one of O, ZnO or rare earth element oxides, x, y, z, w are mass percentages, 20wt%≤x≤65%, 15%≤y≤65%, 0%≤z≤30%, 0 %≤w≤30%. The preparation method of the ceramic is based on SiO 2 , SiO 2 ·nH 2 O, H 3 BO 3 , B 2 o 3 , NaOH, KOH, Ba(OH) 2 ·8H 2 O, Al(OH) 3 , MgO, CaO, SrO, ZnO and rare earth oxides as raw materials, through ball milling, drying, grinding, calcination, granulation, molding and sintering process steps. The degradable ceramic can not only be co-fired with electrode materials such as silver, copper and gold, but also can be co-fired with low-melting-point metal electrodes such as aluminum. Based on its unique borosilicate-rich inorganic polymeric structure as the hydrolysis trigger phase, through the control of the chemical composition of the ceramic and the design of the dispersion distribution of the hydrolysis trigger phase in the structure, the ceramic can degrade itself in humid conditions, water and salt solutions.
Description
technical field [0001] The invention belongs to the field of electronic engineering application and material technology, and in particular relates to a degradable low-temperature co-fired ceramic and a preparation method thereof. Background technique [0002] The development of low-temperature cofired ceramics (Low-temperature cofired ceramics, LTCC) technology has supported the development of circuit integrated packaging and component integration technology, and has become the development direction of passive integration and passive devices, as well as the development of supercomputer technology and national defense information technology. The construction provides important basic conditions, and it has attracted wide attention at home and abroad. In addition to requiring ceramic materials to have specific physical properties, LTCC technology is notable for the fact that the sintering temperature of ceramics must be lower than the melting point of the co-fired metal electro...
Claims
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