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A kind of preparation method of micron potassium sodium niobate acicular powder

A technology of potassium sodium niobate and potassium niobate, which is applied in the field of powder preparation in functional ceramics, can solve the problems of poor density of potassium sodium niobate textured ceramics, inability to use templates, and difficulty in directional arrangement, etc., to achieve technological The process is easy to control, the formula deviation is small, and the effect of mechanical pollution is small

Active Publication Date: 2020-08-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the matrix powder, the flake particles are larger in size, and abnormal grain growth is extremely prone to occur during the sintering process, resulting in poor density of potassium sodium niobate textured ceramics
However, due to the small size of the nanowires, it is difficult to complete the directional arrangement during the tape casting process, and it cannot play the role of a template in the sintering process.

Method used

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  • A kind of preparation method of micron potassium sodium niobate acicular powder
  • A kind of preparation method of micron potassium sodium niobate acicular powder
  • A kind of preparation method of micron potassium sodium niobate acicular powder

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Embodiment 1

[0017] Present embodiment is a kind of preparation method of micron potassium sodium niobate acicular powder, and its specific process is:

[0018] Step 1: preparing a raw material mixture of potassium niobate precursor. Weigh analytically pure SrCO 3 , Nb 2 o 5 and KCl powder. The weighed SrCO 3 , Nb 2 o 5 and KCl were placed in a polyethylene ball mill jar. Add absolute ethanol to a polyethylene ball mill jar and mill on a ball mill for 12 hours. The ball-milled wet material was placed in an oven, and dried at 60°C for 10 hours to obtain a dry powder. Grinding the dry powder into powder with an agate mortar to obtain a raw material mixture of the potassium niobate precursor. The SrCO 3 Molar mass is Nb 2 o 5 5% of the molar weight. The quality of the KCl and the weighed SrCO 3 and Nb 2 o 5 The ratio of the sum of the masses is 1.5:1. Described dehydrated alcohol and the SrCO that is placed in the polyethylene ball mill jar 3 , Nb 2 o 5 The mass ratio of t...

Embodiment 2

[0023] Present embodiment is a kind of preparation method of micron potassium sodium niobate acicular powder, and its specific process is:

[0024] Step 1: preparing a raw material mixture of potassium niobate precursor. Weigh analytically pure SrCO 3 , Nb 2 o 5 and KCl powder. The weighed SrCO 3 , Nb 2 o 5 and KCl were placed in a polyethylene ball mill jar. Add absolute ethanol to a polyethylene ball mill jar and mill on a ball mill for 12 hours. The ball-milled wet material was placed in an oven, and dried at 60°C for 10 hours to obtain a dry powder. Grinding the dry powder into powder with an agate mortar to obtain a raw material mixture of the potassium niobate precursor. The SrCO 3 Molar mass is Nb 2 o 5 10% of the molar weight. The quality of the KCl and the weighed SrCO 3 and Nb 2 o 5 The ratio of the sum of the masses is 1.5:1. Described dehydrated alcohol and the SrCO that is placed in the polyethylene ball mill jar 3 , Nb 2 o 5 The mass ratio of ...

Embodiment 3

[0029] Present embodiment is a kind of preparation method of micron potassium sodium niobate acicular powder, and its specific process is:

[0030] Step 1: preparing a raw material mixture of potassium niobate precursor. Weigh analytically pure SrCO 3 , Nb 2 o 5 and KCl powder. The weighed SrCO 3 , Nb 2 o 5 and KCl were placed in a polyethylene ball mill jar. Add absolute ethanol to a polyethylene ball mill jar and mill on a ball mill for 12 hours. The ball-milled wet material was placed in an oven, and dried at 60°C for 10 hours to obtain a dry powder. Grinding the dry powder into powder with an agate mortar to obtain a raw material mixture of the potassium niobate precursor. The SrCO 3 Molar mass is Nb 2 o 5 15% of the molar weight. The quality of the KCl and the weighed SrCO 3 and Nb 2 o 5 The ratio of the sum of the masses is 1.5:1. Described dehydrated alcohol and the SrCO that is placed in the polyethylene ball mill jar 3 , Nb 2 o 5 The mass ratio of ...

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Abstract

The invention relates to the technical field of powder in functional ceramic and particularly relates to a preparation method of potassium-sodium niobate needle-like powder with high appearance anisotropy. The preparation method of the micro-scale potassium-sodium niobate needle-like powder comprises the steps of preparing a raw material mixture of a potassium niobate precursor, preparing the potassium niobate precursor, preparing a raw material mixture of potassium-sodium niobate, and preparing the potassium-sodium niobate needle-like powder. According to the preparation method, the potassium-sodium niobate particles preserve the needle-like shape of the precursor, the length of prepared potassium-sodium niobate microcrystal powder is about 10-30 microns, the diameter is about 0.5-2 microns, the length-diameter ratio is more than 15, and microcrystal powder particles are uniform and good in dispersity.

Description

technical field [0001] The invention relates to the technical field of powder preparation in functional ceramics, in particular to a preparation method of acicular potassium sodium niobate powder with high shape anisotropy. Background technique [0002] So far, the main lead-free piezoelectric ceramic systems are barium titanate (BT), bismuth sodium titanate (BNT), potassium sodium niobate (KNN) and barium calcium zirconate titanate (BCZT). Potassium sodium ceramic system is one of the current research hotspots. Potassium sodium niobate ceramics prepared by ordinary sintering process have a small piezoelectric constant. However, if the template seed growth method is used to make the grains oriented, the potassium sodium niobate textured ceramics can be prepared, and the piezoelectric constant is as high as 416 pC. / N, almost comparable to lead-containing lead zirconate titanate (PZT) (Y. Saito et al., Lead-free piezoceramics[J]. Nature432 (2004) 84–87). In this process, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/626
CPCC04B35/495C04B35/6261C04B2235/3201C04B2235/3213C04B2235/768C04B2235/785C04B2235/786
Inventor 刘亮亮郭壮壮侯赵平
Owner TAIYUAN UNIV OF TECH