The deformation forms of fireproof board include shrinkage deformation, warpage deformation caused by thickness and density deviation and structural asymmetry. Deformation affects the building function and use effect. Today, let's find out what causes the product deformation and the solutions.

1，過多過大的用水量

1. Excessive water consumption

水分過多使用會(huì)使組合物料漿堿度過度降低，加速了水鎂石氫氧化鎂的形成，抑制了5.1.8相的生成，導(dǎo)致不能獲得應(yīng)有的力學(xué)性能和化學(xué)性能水鎂石不是形成穩(wěn)定性能的膠凝相，另外多余的水要排逸出去。如果這樣排濕度不能均速，排濕不一致其收縮也不一致。收縮應(yīng)力會(huì)造成制品的變形。

Excessive use of water will make the alkalinity of the combined material slurry excessively reduce, accelerate the formation of magnesium hydroxide in brucite, inhibit the formation of 5.1.8 phase, resulting in the failure to obtain due mechanical and chemical properties. Brucite is not a stable cementitious phase, and the excess water will be discharged. If the humidity can not be discharged at the same speed in this way, the shrinkage will be different if the humidity is not discharged at the same time. Shrinkage stress can cause deformation of products.

解決方法：正確的是一般在混合料中液/固比值在0.43~0.47，根據(jù)活性MgO的含量確定MgCl2的用量。同時(shí)應(yīng)設(shè)置干燥設(shè)備，使制品的含水率在出廠前控制在8%~10%，避免在使用過程中因排濕的不一致所造成的變形。在實(shí)際生產(chǎn)中對(duì)于組分中的輕質(zhì)、松軟的填充料應(yīng)盡可能的少加或者不加。這類填充料對(duì)抵制材料的收縮不力，同時(shí)本身的吸潮性也大，加劇了材料的收縮，同時(shí)在組分中也應(yīng)注意纖維的加筋量是否以提高抗擊和防裂要求。

Solution: it is correct to determine the amount of MgCl2 according to the content of active MgO when the liquid / solid ratio of mixture is 0.43 ~ 0.47. At the same time, the drying equipment should be set to control the moisture content of the products at 8% ~ 10% before leaving the factory, so as to avoid the deformation caused by the inconsistency of moisture removal in the process of use. In actual production, the light and soft fillers should be added as little or no as possible. This kind of filler has poor shrinkage resistance to the material, and its moisture absorption is also large, which aggravates the shrinkage of the material. At the same time, attention should be paid to whether the amount of fiber reinforcement in the components can improve the requirements of resistance and crack prevention.
               

2，厚度密度公差大和結(jié)構(gòu)不對(duì)稱

2. Large thickness and density tolerance and asymmetric structure

這種現(xiàn)象多發(fā)生在手工成型時(shí)，因?yàn)槿藶榈牟环€(wěn)定性因素會(huì)照成厚度公差超過板材名義厚度10%板材的容重公差超過6%，這樣造成板材的內(nèi)應(yīng)力偏差大而造成變形。另外因素是增強(qiáng)的玻璃纖維網(wǎng)格布分不均勻，其在制品中的分布位置不對(duì)稱也會(huì)造成結(jié)構(gòu)應(yīng)力引起變性。

This phenomenon often occurs in manual forming, because the artificial instability factors will make the thickness tolerance exceed 10% of the nominal thickness of the plate, and the volume weight tolerance of the plate exceed 6%, which will cause large internal stress deviation and deformation of the plate. The other factor is the uneven distribution of the reinforced glass fiber grid, and the asymmetric distribution of the reinforced glass fiber in the product will also cause the structural stress to cause the deformation.

解決方法：正確的是要注意作為填充的集料比重力應(yīng)盡可能和輕燒氧化鎂粉相一致，避免集料的比重不同造成型過程中成產(chǎn)沉積或上浮于混合料中，造成容重差異大，板材內(nèi)部的收縮、膨脹不一致，產(chǎn)生結(jié)構(gòu)應(yīng)力引起翹曲變形。在使用過程中當(dāng)外界溫度和溫度發(fā)生變化時(shí)，板材因容重的差異大，致在使用過程中吸濕和排濕行為不一致，收縮與膨脹也不一致也會(huì)造成變形。因此，克服厚度公差，容重公差和注重結(jié)構(gòu)的對(duì)稱性是防止變形的關(guān)鍵舉措。

Solution: it is correct to pay attention to that the specific gravity of the filled aggregate should be consistent with that of the light burned magnesia powder as far as possible, so as to avoid that the different specific gravity of the aggregate will cause deposition or floating in the mixture during the molding process, resulting in large difference in unit weight, different shrinkage and expansion inside the plate, resulting in structural stress and warping deformation. In the process of use, when the external temperature and temperature change, due to the large difference of bulk density, the moisture absorption and moisture removal behavior are not consistent in the process of use, and the shrinkage and expansion are not consistent, which will also cause deformation. Therefore, to overcome the thickness tolerance, volume weight tolerance and pay attention to the symmetry of the structure are the key measures to prevent deformation.

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The above is my company's professional and technical personnel to introduce you to the fire board deformation reasons and solutions, hope to help you, if you want to know more information, please click: fumika fire board http:// .