Porous Si3N4 fabrication via volume-controlled foaming and their sound absorption properties

Wang, Feng; Gu, Hao; Yin, Jinwei; Xia, Yongfeng; Zuo, Kaihui; Liang, Hanqin; Ning, Congqin; Yao, Dongxu; Zeng, Yu‐Ping

doi:10.1016/j.jallcom.2017.07.232

Cited by 20 publications

(9 citation statements)

References 18 publications

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“…Even though the first resonance frequency appeared in the medium and low frequency, the low-frequency sound-absorption property of the samples still remained lower than that of the sample containing 4 wt% TAC, a finding that is consistent with previous studies. 32,38 For comparison, the 4 wt% TAC was selected. XRD patterns of samples with 0 TAC, 4 wt% TAC, and 5 wt% TAC were detected, as shown in Figure 10.…”

Section: Tac Effectmentioning

confidence: 99%

Open‐cell porous sound‐absorbing ceramics prepared by a new procedure that combines foamed and templated methods

Tian

Tang

Wang

et al. 2020

Int J Applied Ceramic Tech

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Low-grade nonmetal ore, mainly magmatic soil and tuff, was used to prepare porous sound-absorbing ceramics. A new processing method that combines the foaming and templating methods was used to produce open-cell porous ceramics. Silicon carbide and carbon powders were used as the foaming agent and template agent, respectively, and their effects on open-cell preparation and sound-absorption properties were also investigated. The results showed that sound-absorption performance was closely related to the apparent porosity (H). Compared with either foaming or template methods, the new method incorporating both processes increased the sound-absorption coefficient (α) and H by 51%-258% and 69%-728%, respectively. Optimum sound absorption of the ceramics, that is, α = 0.68, noise reduction coefficient (NRC) = 0.48, and H = 50.22%, were obtained at foaming agent contents (FACs) of 1.5 wt% and template agent contents (TACs) of 4 wt%. The Delany-Bazley and Voronina models were selected to simulate the sound-absorption coefficients and the latter one fitted well with our experimental results. K E Y W O R D Scombined foamed and templated method, open cell, sound-absorption mechanism, sound-absorbing ceramics, voronina model

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Section: Tac Effectmentioning

confidence: 99%

Open‐cell porous sound‐absorbing ceramics prepared by a new procedure that combines foamed and templated methods

Tian

Tang

Wang

et al. 2020

Int J Applied Ceramic Tech

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“…As a result, the amplitude of the vibration displacement is reduced, the free vibration fades out faster and the waves reverberate through the resilient elements. The most recommended damping layers include polymers, elastomers, organic glasses, rubbers, felt and bituminous materials (Arenas & Crocker, 2010, Wang, 2017, Cao, 2018, Rafiee et al, 2019, Yano et al, 2019, Hu et al, 2018. There is no information in the literature about the impact of the number of layers of silencing systems on their properties in this area.…”

Section: Vibrations and Anti-vibration Mountsmentioning

confidence: 99%

The Influence of the Number of Polyurethane Anti-Vibration Mount on the Vibration Damping Efficiency of Steel Structure

Nowacki

Łakomy

2019

New Trends in Production Engineering

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The publication presents the results of research on the statistically significant impact of the number of layers on vibration damping properties of vibroacoustic mats. The research was carried out on the author’s research stand. The research was carried out on sandwich systems made of polyurethane foam. The impact force of the analyzed variables was determined on the basis of constructed multiple regression models, the so-called multifactor models and determination of the standardized value β. The research was carried out using the PQStat software. In the models being built, the significance level was p < 0.05. Three statistically significant linear multivariate models for one-third frequencies were constructed: • 0-20000 Hz – a model for the entire frequency spectrum analysed during the tests, • 0-400 Hz – a model for frequencies generating construction vibrations that may affect the worker as general vibrations, • 50-20000 Hz – a model for frequencies that generate construction vibrations that can cause auditory sensations (noise). It was found: positive correlation of the number of layers in vibration damping systems with a third octave frequency of up to 400 Hz; negative correlation of the number of layers in vibration damping systems with a third octave frequency of 50 to 20000 Hz.

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“…Yin et al 19 adopted protein as foaming agent to fabricate Si 3 N 4 ceramic foams and obtained different pore structures by varying the addition of different protein. Wang et al 20 prepared Si 3 N 4 ceramic foams by direct foaming with short‐chain surfactant, and porosity of the foams was tailored by foaming in controlled volume.…”

Section: Introductionmentioning

confidence: 99%

Effects of surfactant and particle size on the microstructure and strength of Si3N4 foams with high porosity

Yao

Xia

et al. 2021

Int J Applied Ceramic Tech

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Ceramic foams, as a class of porous ceramics with three-dimensional network pore structure, have many unique properties, such as high porosity, light weight, and high permeability. [1][2][3] Consequently, increasing attentions has been cast on ceramic foams in recent years. [4][5][6] Among the ceramic foams, silicon nitride (Si 3 N 4 ) foams have versatile performances including great chemical stability, excellent thermal stability, and good mechanical strength. On account of these unique properties, Si 3 N 4 foams have been wildly applied in many fields, such as hot gas purification, sound absorbers, molten metal filters, and catalyst carriers. 7,8 Moreover, to meet the demands of these applications, high porosity of ceramic foams is usually required. So far, a variety of methods including sacrificial template method, 9,10 replica technique, 11,12 and direct foaming method 13,14 have been applied to the preparation of ceramic foams. It is noteworthy that direct foaming method provides an

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Porous Si3N4 fabrication via volume-controlled foaming and their sound absorption properties

Cited by 20 publications

References 18 publications

Open‐cell porous sound‐absorbing ceramics prepared by a new procedure that combines foamed and templated methods

Open‐cell porous sound‐absorbing ceramics prepared by a new procedure that combines foamed and templated methods

The Influence of the Number of Polyurethane Anti-Vibration Mount on the Vibration Damping Efficiency of Steel Structure

Effects of surfactant and particle size on the microstructure and strength of Si3N4 foams with high porosity

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