真空热处理时间对竹材物理力学性能的影响

摘要：热处理改性工艺作为一种绿色环保的物理改性处理方法，一直是是木材改性处理的研究热点方向。随着真空热处理技术的出现和发展，真空热处理的产品具有无氧化，无脱碳、脱气、脱脂，表面质量好，变形小，综合力学性能高，可靠性好（重复性好，寿命稳定）等一系列优点。目前真空热处理技术的发展尚不成熟，但真空热处理技术具有上述诸多优势，进行全面而系统的研究非常有必要。本研究以资源丰富的竹材为研究对象，通过了解真空热处理的时间对于竹材物理力学性能的影响，是揭示真空热处理过程中竹材物理力学相关数据(色差、尺寸稳定性、抗弯强度、弹性模量)原理、实现竹材热处理过程中时间对物理力学性质相关数据的有效控制的重要手段，从而为竹材热处理提供工艺参考。

关键词：竹材；真空热处理；色差；尺寸稳定性；抗弯强度；弹性模量

Effect of Vacuum Heat Treatment Time on Physical and Mechanical Properties of Bamboo

ABSTRACT

As a green environmental protection treatment method, the heat treatment modification process has always been the research hotspot of wood modification treatment. With the emergence and development of vacuum heat treatment technology, vacuum heat treatment products have no oxidation, no decarburization, degassing, degreasing, good surface quality, small deformation, high comprehensive mechanical properties, good reliability (reproducibility, stable life) A series of advantages. At present, the development of vacuum heat treatment technology is not mature, but the vacuum heat treatment technology has many of the above advantages, and it is necessary to carry out comprehensive and systematic research. This study takes resource-rich bamboo as the research object. By understanding the influence of vacuum heat treatment time on the physical and mechanical properties of bamboo, it is to reveal the physical and mechanical data of bamboo in vacuum heat treatment (color difference, dimensional stability, flexural strength, elastic modulus). The principle and the important means to achieve effective control of the physical and mechanical properties of the bamboo during heat treatment process, thus providing a process reference for bamboo heat treatment.

Key words: bamboo; vacuum heat treatment; color difference; dimensional stability; flexural strength; elastic modulus

1 引言

我国地处世界竹子分布中心,是世界上竹类资源最丰富的国家,素有'竹子王国”之称。20世纪90年代以来,作为一种一次栽种水续利用的代木材料,竹子在我国得到了迅速发展,竹林面积、竹子产量、竹林产业都有明显地提高。竹材具有生产速度快,产量高,力学强度高等特点,若能加快竹材产业的发展,加大竹材在人造板中的开发利用,将有效地减缓我国木材资源的供需矛盾。