Evaluation of combustion characteristics for wood specimens coated with metal oxides of different oxidation states in the secondary stage of combustion (II)

IF 3.1 2区农林科学 Q1 FORESTRY

Wood Science and Technology Pub Date : 2023-12-07 DOI:10.1007/s00226-023-01510-5

Eui Jin, Yeong-Jin Chung

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Abstract

Metal oxides were applied to cypress wood typically used as an interior building material. Combustion characteristics were evaluated focusing on the oxidation state of metal ions and char characteristics of the second stage of combustion. The burning properties of the materials were measured using a cone calorimeter (ISO 5660-1). The external heat flux was fixed at 50 kW/m². FeO, Fe₂O₃, SnO and SnO₂ were used as the metal oxides, and sodium silicate was mixed with increasing the flame-retardant effect. SnO₂SS was 1.05 times lower than the 164.76 kW/m² of the uncoated specimen. The other specimens increased 1.03–1.09 times. The peak smoke production rate of the wood specimens coated with flame retardant was 1.2–1.6 times lower than the uncoated specimens. SnO₂SS had the lowest value and showed a synergetic effect with SS. The CO/CO₂ ratio of the test specimens coated with the silicate compound was 1.6–2.3 times lower than that of the uncoated specimen. In SnO₂SS, HRR_{2nd_peak} and SPR_{2nd_peak} decreased because the generated heat was dispersed by convection because of pores in the char. This formed a relatively hard and heat-stable char structure.

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评估涂有不同氧化态金属氧化物的木材试样在二次燃烧阶段的燃烧特性（II）

金属氧化物适用于通常用作室内建筑材料的柏木。对燃烧特性进行了评估，重点是金属离子的氧化状态和第二阶段燃烧的焦炭特性。材料的燃烧特性是用锥形量热仪（ISO 5660-1）测量的。外部热通量固定为 50 kW/m2。使用 FeO、Fe2O3、SnO 和 SnO2 作为金属氧化物，并掺入硅酸钠以增加阻燃效果。与未涂层试样的 164.76 kW/m2 相比，SnO2SS 降低了 1.05 倍。其他试样提高了 1.03-1.09 倍。涂有阻燃剂的木材试样的峰值产烟率比未涂抹的试样低 1.2-1.6 倍。SnO2SS 的值最低，并显示出与 SS 的协同效应。涂有硅酸盐化合物的试样的 CO/CO2 比率比未涂的试样低 1.6-2.3 倍。在 SnO2SS 中，HRR2nd_peak 和 SPR2nd_peak 下降，因为炭中的孔隙使产生的热量通过对流分散。这就形成了一种相对坚硬且热稳定的炭结构。

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来源期刊

Wood Science and Technology 工程技术-材料科学：纸与木材

CiteScore

5.90

自引率

5.90%

发文量

审稿时长

3 months

期刊介绍： Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.