A kind of high-frequency low-loss glass-ceramic containing lanthanum oxide and its preparation method

A glass-ceramic and lanthanum oxide-containing technology, which is applied in the field of high-frequency and low-loss microwave dielectric materials and their manufacturing, can solve the problems of lowering the product qualification rate, unable to monitor glass bubbles in real time, increasing production costs, etc. efficiency, ease of control, improved transparency

Active Publication Date: 2017-02-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Generally, glass has better transparency in the visible light band, but in the above-mentioned researched systems, due to the introduction of variable price rare earth 2 , under the joint action of Ce and Ti, the original glass is brown-black and almost opaque. In the mass production process, it is impossible to monitor the bubbles, stones and other defects in the glass in real time and prevent them from entering the subsequent process in time, reducing the final The qualification rate of the product increases the production cost

Method used

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  • A kind of high-frequency low-loss glass-ceramic containing lanthanum oxide and its preparation method
  • A kind of high-frequency low-loss glass-ceramic containing lanthanum oxide and its preparation method
  • A kind of high-frequency low-loss glass-ceramic containing lanthanum oxide and its preparation method

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preparation example Construction

[0033] 1. Preparation of Pristine Glass

[0034] 1) Batching and mixing: Weigh quartz sand, magnesium oxide, aluminum oxide, titanium oxide, cerium oxide and lanthanum oxide and other raw materials according to the distribution ratio of the glass-ceramics and mix them into glass batches. The purity of the above raw materials does not need to be strictly required, and it is only necessary to control the content of monovalent alkali metal <0.5%. For example, abundant and cheap chemical raw materials can be used to reduce production costs.

[0035] 2) Melting: Put the glass batch material into the crucible, melt it at 1450-1530℃ and keep it warm for 2-4 hours, then pour it into the mold and cast it into shape.

[0036] 3) Annealing: heat preservation at 620-660°C for 3-5 hours in the annealing furnace, then cool down to room temperature with the furnace, so as to obtain the original glass.

[0037] In the present invention, use La 2 o 3 replace CeO 2 , can significantly impr...

Embodiment 1

[0048] Glass composition (wt%) is:

[0049] MgO Al 2 o 3 SiO 2 TiO 2 CeO 2 La 2 o 3

[0050] 7.7 23.2 32.0 18.2 6.5 12.4

[0051] Quartz sand, magnesium oxide, aluminum oxide, titanium oxide, cerium oxide and lanthanum oxide are used as raw materials, weighed and mixed according to the above components, melted at 1520 ° C for 3 hours, poured into cast iron molds, and placed in an annealing furnace for 640 °C ℃ for 4 hours and then cooled to room temperature with the furnace to obtain brown-red transparent glass. Then the temperature was raised from room temperature to 1250 °C at a rate of 5 °C / min, kept for 2 hours, and then cooled to room temperature with the furnace to obtain a high-frequency high-quality factor glass-ceramic dielectric material. The dielectric constant is 10.99, the quality factor is 19464GHz, and other properties are shown in Table 1. figure 1 The XRD spectrum of the glass-ceramics prepared in this example, the abscissa is 2 times the diffrac...

Embodiment 2

[0053] Glass composition (wt%) is:

[0054] MgO Al 2 o 3 SiO 2 TiO 2 La 2 o 3

[0055] 8.2 24.9 34.2 19.5 13.2

[0056] Use quartz sand, magnesium oxide, aluminum oxide, titanium oxide and lanthanum oxide as raw materials, weigh and mix according to the above components, melt at 1520°C for 3 hours, pour it into a cast iron mold, and place it in an annealing furnace for 4 hours at 640°C After cooling to room temperature with the furnace, brownish-yellow transparent glass was obtained. Then the temperature was raised from room temperature to 1150 °C at a rate of 5 °C / min, kept for 10 hours, and then cooled to room temperature with the furnace to obtain a high-frequency high-quality factor glass-ceramic dielectric material. The dielectric constant is 10.59, the quality factor is 22398GHz, and other properties are shown in Table 1.

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Abstract

The invention relates to high frequency low loss microcrystalline glass containing lanthanum oxide and a preparation method of the microcrystalline glass. The microcrystalline glass comprises the following components in percentage by weight: 6-9% of MgO, 19-27% of Al2O3, 26-37% of SiO2, 15-21% of TiO2, 0-7% of CeO2 and 7-32% of La2O3. According to the microcrystalline glass provided by the invention, CeO2 is replaced by La2O3, La and Ce are in adjacent positions in the periodic table and are greatly similar, and meanwhile, La<3+> ions are colorless and valence is not changed, so that the transparency of original glass is improved under the condition that the forming capacity and performance of the glass are not subjected to relatively great influence, defected products with defects in the founding process are easily screened, the batch rate is improved and the production cost is lowered.

Description

technical field [0001] The invention provides a high-frequency low-loss microwave dielectric material and a manufacturing method thereof, belonging to the field of glass-ceramic materials. More precisely, the high-frequency low-loss glass-ceramic material prepared by the method provided by the present invention has a dielectric constant ε ranging from 9 to 13 at a frequency of about 10 GHz, and a quality factor Qf up to 24531 GHz (Qf=f / tgδ ), and the original glass has good transparency, which is conducive to quality control in the production process. Background technique [0002] With the continuous development of microwave communication, the research of microwave dielectric materials has developed by leaps and bounds, and they are widely used in military, aerospace, electronic packaging and other fields. Traditional microwave materials are mainly ceramics. Due to the continuous improvement of material performance requirements, the development of new materials with better ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00C03C10/02C03C10/08
Inventor 王慧娟林慧兴李泊涛陈玮罗澜
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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