CN116283264A - 一种吸收微波发热粉体及其制备方法 - Google Patents
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Abstract
本发明公开了一种吸收微波发热粉体及其制备方法，吸收微波发热粉体包括以下重量份数的原料：Fe2O3 600‑700份；CuO 40‑50份；NiO 80‑100份；ZnO 150‑190份；CaO 3‑8份。本申请的吸收微波发热粉体具有升温速度快，发热温度高，控温范围广，温度稳定可控等特点。克服了以往锰锌铁氧体升温速度慢，发热温度不高，温度稳定性差的缺点。拓宽了吸收微波材料的使用范围和用途。使用在微波炉烹调器皿方面具有更大的优势。
Description
技术领域
本发明涉及微波加热技术领域，特别涉及一种吸收微波发热粉体配方及其制备方法。
背景技术
众所周知典型的微波炉用品就是微波炉烤盘，它的工作原理是利用贴在烤盘底下的吸收微波材料，将微波能转换为热能，加热金属烤盘，使烤盘内是食物不但可直接由微波加热，还可由烤盘加热，这种双向的受热模式使食物加工不但缩短了时间，而且可以使各种传统的烹调方式如煎、炸、焖、煮等得以在微波炉中实现，大大开拓了微波炉的使用功能，深受广大用户的欢迎。
随着微波炉的普及和使用人群的变化，用户对吸收微波配件提出了越来越多的需求，主要是在使用功能方面；如在煎食物时不能出现焦黑，要保持食物表面微黄；做牛排、羊排既要有烧烤的效果，又不出现常规烧烤的烧焦现象；可做炸鸡腿、披萨、煎蛋、煮蔬菜等；可煮白米饭，还可煮出传统煲仔饭。
以往的微波炉烹调器具使用的微波吸收发热粉体是用锰锌铁氧体，存在着升温速度慢，温度稳定性差，高温区温度偏低达不到欧美客户要求等问题。究其原因主要是锰锌铁氧体的适用范围是在1kHz～5MHz的较低频率区域，而工业或家用微波炉的频率通常是在915±25MHz至2450±50MHz之间。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一。为此，本发明提出一种采用镍锌系列铁氧体制成的微波发热材料，并对其相关配方和工艺方面进行改良，使新的微波发热材料制成的微波炉烹调器具有升温速度快，温度稳定性好、温度可控，高温区的最高温度比以往的锰锌铁氧体提高了20至25℃，采用的技术方案为：
一种吸收微波发热粉体，包括以下重量份数的原料：
本申请还公开一种吸收微波发热粉体的制备方法，其特征在于，包括：
步骤1、按照配方称取粉体原料，搅拌并混合均匀；
步骤2、将混合后的粉料进行烧结，烧结后依然是粉体。
步骤3、将烧结后的粉料进行沙磨，干燥至含水率低于0.02％，过筛，获得吸收微波发热粉体。
作为优选，所述步骤1中采用强混机对粉体原料进行混合12-24h。
作为优选，所述步骤2中，将粉体置入烧结炉中，以10-20℃/min的升温速度升温到1200-1250℃进行烧结，烧结时间为24h，室温冷却24h。
作为优选，所述步骤3中，沙磨时间为36h。
作为优选，步骤3中过筛目数为300目。
本发明的有益效果为：
(1)本申请通过采用镍锌铁氧体制作吸收微波发热材料，适应微波炉2.45GHz高频的需要；
(2)除了镍锌铁氧体外，还通过加入CaO等添加剂提高铁氧体的电阻率，降低涡流损耗，最大程度的减少了磁性损耗外的发热作用，从而实现发热温度精准可控，CuO的加入可以降低烧结温度，使晶粒更加完整，并进一步提高了发热粉体的质量。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1为本申请实施例所述容器的结构示意图；
图2为本申请实施例所述容器的仰视图。
具体实施方式
本部分将详细描述本发明的具体实施例，参照上述内容，提出本申请的具体实施例1-3和对比例1-2，实施例1-3和对比例1-2所述吸收微波发热粉体材料的配方中各原料的重量份如表1所示。
表1
| 实施例1 | 实施例2 | 实施例3 | 对比例1 | 对比例2 | |
| Fe2O3 | 600 | 650 | 700 | 720 | 862 |
| CuO | 40 | 45 | 50 | - | - |
| CaO | 3 | 5 | 8 | - | - |
| MnO | - | - | - | 213 | 177 |
| NiO | 80 | 90 | 100 | - | - |
| ZnO | 190 | 175 | 150 | 105 | 122 |
将实施例1-3、对比例1-2中的吸波粉体按照以下制作方法分别制作吸收微波发热粉体，具体方法包括：
步骤1、按照配方称取粉料，将粉料置于强混机中进行强混12h；
步骤2、将混合后的粉料置于烧结炉中，以15℃的温度升温至1230℃下烧结24小时后，室温冷却24h至室温；
步骤3、将烧结后的粉料进行沙磨36h，干燥至含水量小于或等于0.02％，过300目筛获得微波吸波粉体。
将实施例1-3、对比例1-2中的吸波粉体与耐热硅橡胶耐热剂和硫化剂用密炼机混炼均匀制备成胶料，将上述混炼好的胶料用压延机或开放式炼胶机压成1至3mm的生片，冷却至室温；
将生片分别加压加热进行硫化处理成型得到吸波发热弹性材料压片。
将实施例1-3、对比例1-2中的吸波发热弹性材料压片1贴敷在容器2(可以是微波炉烤盘，饭盒等)底部，如图1和2所示，本实施例所述容器为微波炉饭盒，再将贴覆有吸波发热弹性材料的微波炉饭盒放入微波炉中分别进行加热。
其中，实施例1-3、对比例1-2中使用的微波炉饭盒置于微波炉中，在2.45GHz高频下采用800W的功率进行,分别检测实施例1-3、对比例1-2的容器内中部的表面温度如表2所示。
表2
(1)由表格中的内容可以看出，实施例1-3中由改性镍锌铁氧体制得的吸波发热弹性材料的控温范围依次为150℃、220℃和250℃，本实施例中制得的吸波发热弹性材料的最高温度比对比例的吸波发热弹性材料最高温度高25℃，且出现最高温度的时间提前5分钟。
(2)实施例1-3中制得的吸波发热弹性材料的控温范围在150-250℃之间，如有需要还可通过调节吸收微波发热粉体配方和它与弹性材料的配比可实现温度的调节，可控温度范围更大；
(3)实施例1-3在升温5min后可达到最高温度，当达到预设温度后，容器的温度波动不超过±5℃，对比例1-2中制得的吸波发热弹性材料升温速度较慢，需要升温10min后才能达到最高温度，在5-10min内的温度波动与实施例1-3相比温度波动更大，试验证明本申请制得的粉体温度控制更加稳定，且升温速度更快。
当然，本发明并不局限于上述实施方式，熟悉本领域的技术人员在不违背本发明精神的前提下还可作出等同变形或替换，这些等同的变形和替换均包含在本申请权利要求所限定的范围内。
Claims (6)
1.一种吸收微波发热粉体，其特征在于，包括以下重量份数的原料：
2.一种如权利要求1所述的吸收微波发热粉体的制备方法，其特征在于，包括：
步骤1、按照配方称取粉体原料，搅拌并混合均匀；
步骤2、将混合后的粉料进行烧结，冷却至室温；
步骤3、将烧结后的粉料进行沙磨，干燥至含水率低于0.02％，过筛，获得吸收微波发热粉体。
3.根据权利要求2所述的吸收微波发热粉体的制备方法，其特征在于，所述步骤1中采用强混机对粉体原料进行混合12-24h。
4.根据权利要求2所述的吸收微波发热粉体的制备方法，其特征在于，所述步骤2中，将粉体置入烧结炉中，升温到1200-1250℃进行烧结，烧结时间为24h，室温冷却24h。
5.根据权利要求2所述的吸收微波发热粉体的制备方法，其特征在于，所述步骤3中，沙磨时间为36h。
6.根据权利要求2所述的吸收微波发热粉体的制备方法，其特征在于，步骤3中过筛目数为300目。
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Citations (8)
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